Nissan Pathfinder: Seat - Dtc/circuit Diagnosis

• B2490-13 Front Seat Heater Lh
• B2490-19 Front Seat Heater Lh
• B2495-13 Rear Seat Heater Lh
• B2495-19 Rear Seat Heater Lh
• U1ca3-08 Seat Heater Communication
• U1ca7-02 Front Seat Heater Lh Communication
• U1ca9-02 Rear Seat Heater Lh Communication
• Front Seat Heater Lh
• Second Row Seat Heater Lh
• Seat Blower Lh
• Walk in Switch
• Seat Angle Sensor
• Seat Walk in Motor
• Power Supply and Ground Circuit. Second Row Seat Power Walk in Control Unit

B2490-13 Front Seat Heater Lh Nissan Pathfinder 5th Gen

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detection condition
B2490-13	FRONT SEAT HEATER LH (Front seat heater left hand)	Diagnosis condition	Engine running
		Signal (terminal)	—
		Threshold	CPU in front seat heater LH detect heating wire resistance more than 2.6 Ω
		Diagnosis delay time	1.5 seconds or more

POSSIBLE CAUSE

• Harness or connectors (front seat heater LH ground circuit is open)

• Seat cushion heater LH

• Seat back heater LH

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Start the engine.

2. Select “Self Diagnostic Result” mode of “HVAC”.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO>>

Confirmation after repair: Inspection End.

DTC Diagnosis Procedure

CHECK FRONT SEAT HEATER LH GROUND CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect front seat heater LH connector.

3. Check continuity between front seat heater LH harness connector and ground.

   With heated seat

   Front seat heater LH		—	Continuity
   Connector	Terminal
   B230	4	Ground	Yes

   With climate controlled seat

   Front seat heater LH		—	Continuity
   Connector	Terminal
   B232	1	Ground	Yes
   	5

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair the harness or connector.

CHECK SEAT BACK HEATER LH CIRCUIT (OPEN)

1. Disconnect front seat back heater LH connector.

2. Check continuity between front seat back heater LH harness connector and front seat heater LH harness connector.

   With heated seat

   Front seat back heater LH		Front seat heater LH		Continuity
   Connector	Terminal	Connector	Terminal
   B235	2	B231	1	Yes

   With climate controlled seat

   Front seat back heater LH		Front seat heater LH		Continuity
   Connector	Terminal	Connector	Terminal
   B237	2	B236	2	Yes

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Replace seat cushion heater LH. Refer to Seat Cushion.

CHECK SEAT BACK HEATER LH GROUND CIRCUIT (OPEN)

Check continuity between front seat back heater LH harness connector and front seat heater LH harness connector.

With heated seat

Front seat back heater LH		Front seat heater LH		Continuity
Connector	Terminal	Connector	Terminal
B235	1	B231	4	Yes

With climate controlled seat

Front seat back heater LH		Front seat heater LH		Continuity
Connector	Terminal	Connector	Terminal
B237	1	B236	5	Yes

Is the inspection result normal?

YES>>

Replace front seat back heater LH. Refer to Seat Back.

NO>>

Replace seat cushion heater LH. Refer to Seat Cushion.

B2490-19 Front Seat Heater Lh Nissan Pathfinder SUV

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detection condition
B2490-19	FRONT SEAT HEATER LH (Front seat heater left hand)	Diagnosis condition	Engine running
		Signal (terminal)	—
		Threshold	CPU in front seat heater LH detect heating wire resistance less than 1.3 Ω
		Diagnosis delay time	1.5 seconds or more

POSSIBLE CAUSE

• Seat cushion heater LH

• Front seat back heater LH

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Start the engine.

2. Select “Self Diagnostic Result” mode of “HVAC”.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO>>

Confirmation after repair: Inspection End.

DTC Diagnosis Procedure

CHECK FRONT SEAT BACK HEATER LH CIRCUIT (SHORT TO GROUND)

1. Ignition switch OFF.

2. Disconnect front seat heater LH connector and front seat back heater LH connector.

3. Check continuity between front seat back heater LH harness connector and ground.

   With heated seat

   Front seat back heater LH		—	Continuity
   Connector	Terminal
   B235	2	Ground	No

   With climate controlled seat

   Front seat back heater LH		—	Continuity
   Connector	Terminal
   B237	2	Ground	No

Is the inspection result normal?

YES>>

Replace front seat back heater LH. Refer to Seat Back.

NO>>

Replace seat cushion heater LH. Refer to Seat Cushion.

B2495-13 Rear Seat Heater Lh Nissan Pathfinder R53

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detection condition
B2495-13	REAR SEAT HEATER LH (Rear seat heater left hand)	Diagnosis condition	Engine running
		Signal (terminal)	—
		Threshold	CPU in second row seat heater LH detect heating wire resistance more than 2.6 Ω
		Diagnosis delay time	1.5 seconds or more

POSSIBLE CAUSE

• Harness or connectors

• Second row seat cushion heater LH

• Second row seat back heater LH

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Start the engine.

2. Select “Self Diagnostic Result” mode of “HVAC”.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO>>

Confirmation after repair: Inspection End.

DTC Diagnosis Procedure

CHECK SECOND ROW SEAT CUSHION HEATER LH GROUND CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect second row seat cushion heater LH connector.

3. Check continuity between second row seat cushion heater LH harness connector and ground.

   Second row seat cushion heater LH		—	Continuity
   Connector	Terminal
   B547	4	Ground	Yes

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair the harness or connector.

CHECK SECOND ROW SEAT BACK HEATER LH CIRCUIT (OPEN)

1. Disconnect second row seat back heater LH connector.

2. Check continuity between second row seat back heater LH harness connector and second row seat cushion heater LH harness connector.

Second row seat back heater LH		Second row seat cushion heater LH		Continuity
Connector	Terminal	Connector	Terminal
B526	2	B547	3	Yes

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair the harness or connector.

CHECK SECOND ROW SEAT BACK HEATER LH GROUND CIRCUIT (OPEN)

Check continuity between second row seat back heater LH harness connector and ground.

Second row seat back heater LH		—	Continuity
Connector	Terminal
B526	1	Ground	Yes

Is the inspection result normal?

YES>>

Replace second row seat cushion heater LH. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

B2495-19 Rear Seat Heater Lh Nissan Pathfinder R53

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detection condition
B2495-19	REAR SEAT HEATER LH (Rear seat heater left hand)	Diagnosis condition	Engine running
		Signal (terminal)	—
		Threshold	CPU in second row seat heater LH detect heating wire resistance less than 1.3 Ω
		Diagnosis delay time	1.5 seconds or more

POSSIBLE CAUSE

• Second row seat cushion heater LH

• Second row seat back heater LH

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Start the engine.

2. Select “Self Diagnostic Result” mode of “HVAC”.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO>>

Confirmation after repair: Inspection End.

DTC Diagnosis Procedure

CHECK SECOND ROW SEAT BACK HEATER LH CIRCUIT (SHORT TO GROUND)

1. Ignition switch OFF.

2. Disconnect second row seat cushion heater LH connector and second row seat back heater LH connector.

3. Check continuity between second row seat back heater LH harness connector and ground.

   Second row seat back heater LH		—	Continuity
   Connector	Terminal
   B256	2	Ground	No

Is the inspection result normal?

YES>>

Replace second row seat back heater LH. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

U1ca3-08 Seat Heater Communication Nissan Pathfinder 2022

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detection condition
U1CA3-08	SEAT HEATER COMMUNICATION (Seat heater communication)	Diagnosis condition	Engine running
		Signal (terminal)	LIN (heated seat) signal (terminal #45)
		Threshold	A/C auto amp. is not transmitting or receiving LIN communication with each seat heater
		Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

• Fuse

• Harness or connectors (seat heater circuit is open or short to ground)

• Each seat cushion heater

• A/C auto amp.

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Start the engine.

2. Select “Self Diagnostic Result” mode of “HVAC”.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO>>

Confirmation after repair: Inspection End.

DTC Diagnosis Procedure

CHECK DTC

CONSULT

1. Start the engine.

2. Select “Self Diagnostic Result” mode of “HVAC”.

3. Check following DTC:

   DTC	Items (CONSULT screen terms)	Reference
   U1CA6-02	FRONT SEAT HEATER RH COMMUNICATION	DTC Description
   U1CA7-02	FRONT SEAT HEATER LH COMMUNICATION	DTC Description
   U1CA8-02	REAR SEAT HEATER RH COMMUNICATION	DTC Description
   U1CA9-02	REAR SEAT HEATER LH COMMUNICATION	DTC Description

Is DTC detected?

YES>>

Perform diagnosis procedure for the DTC that is detected.

NO>>

Replace A/C auto amp. Refer to Removal and Installation.

U1ca7-02 Front Seat Heater Lh Communication Nissan Pathfinder R53

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detection condition
U1CA7-02	FRONT SEAT HEATER LH COMMUNICATION (Front seat heater left hand communication)	Diagnosis condition	Engine running
		Signal (terminal)	LIN (heated seat) signal (terminal #45)
		Threshold	A/C auto amp. is not transmitting or receiving LIN communication with front seat heater LH
		Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

• Fuse

• Harness or connectors (front seat heater LH circuit is open or short to ground)

• Front seat cushion heater LH

• A/C auto amp.

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Start the engine.

2. Select “Self Diagnostic Result” mode of “HVAC”.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO>>

Confirmation after repair: Inspection End.

DTC Diagnosis Procedure

CHECK FUSE

1. Ignition switch OFF.

2. Check that the following fuse is not blown (open):

   Signal name	Fuse No.	Capacity
   Front seat heater LH power supply	66	30A

Is the fuse blown (open)?

YES>>

Replace the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).

NO>>

GO TO 2.

CHECK FRONT SEAT HEATER LH POWER SUPPLY VOLTAGE

1. Disconnect front seat heater LH connector.

2. Start the engine.

3. Check voltage between front seat heater LH harness connector and ground.

   With heated seat

   +		-	Voltage (Approx.)
   Front seat heater LH
   Connector	Terminal
   B230	1	Ground	Battery voltage

   With climate controlled seat

   +		-	Voltage (Approx.)
   Front seat heater LH
   Connector	Terminal
   B232	2	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair the harness or connector.

CHECK FRONT SEAT HEATER LH GROUND CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Check continuity between front seat heater LH harness connector and ground.

   With heated seat

   Front seat heater LH		—	Continuity
   Connector	Terminal
   B230	4	Ground	Yes

   With climate controlled seat

   Front seat heater LH		—	Continuity
   Connector	Terminal
   B232	1	Ground	Yes
   	5

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair the harness or connector.

CHECK FRONT SEAT HEATER LH LIN SIGNAL

1. Ignition switch ON.

2. Confirm output waveform between front seat heater LH harness connector and ground with oscilloscope.

   With heated seat

   +		-	Output waveform
   Front seat heater RH
   Connector	Terminal
   B230	2	Ground

   With climate controlled seat

   +		-	Output waveform
   Front seat heater RH
   Connector	Terminal
   B232	6	Ground

Is the inspection result normal?

YES>>

Replace seat cushion heater LH. Refer to Seat Cushion.

NO>>

GO TO 5.

CHECK FRONT SEAT HEATER LH LIN SIGNAL CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between front seat heater LH harness connector and A/C auto amp. harness connector.

   With heated seat

   Front seat heater LH		A/C auto amp.		Continuity
   Connector	Terminal	Connector	Terminal
   B230	2	M60	45	Yes

   With climate controlled seat

   Front seat heater LH		A/C auto amp.		Continuity
   Connector	Terminal	Connector	Terminal
   B232	6	M60	45	Yes

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair the harness or connector.

CHECK FRONT SEAT HEATER LH LIN SIGNAL CIRCUIT (SHORT TO GROUND)

1. Disconnect the following connectors:

   • Front seat heater RH

   • Second row seat cushion heater LH

   • Second row seat cushion heater RH

2. Check continuity between front seat heater LH harness connector and ground.

   With heated seat

   Front seat heater LH		—	Continuity
   Connector	Terminal
   B230	2	Ground	No

   With climate controlled seat

   Front seat heater LH		—	Continuity
   Connector	Terminal
   B232	6	Ground	No

Is the inspection result normal?

YES>>

Replace A/C auto amp. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

U1ca9-02 Rear Seat Heater Lh Communication Nissan Pathfinder

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detection condition
U1CA9-02	REAR SEAT HEATER LH COMMUNICATION (Rear seat heater left hand communication)	Diagnosis condition	Engine running
		Signal (terminal)	LIN (heated seat) signal (terminal #45)
		Threshold	A/C auto amp. is not transmitting or receiving LIN communication with second row seat cushion heater LH
		Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

• Fuse

• Harness or connectors (second row seat cushion heater LH circuit is open or short to ground)

• Second row seat cushion heater LH

• A/C auto amp.

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Start the engine.

2. Select “Self Diagnostic Result” mode of “HVAC”.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO>>

Confirmation after repair: Inspection End.

DTC Diagnosis Procedure

CHECK FUSE

1. Ignition switch OFF.

2. Check that the following fuse is not blown (open):

   Signal name	Fuse No.	Capacity
   Second row seat cushion heater LH power supply	66	30A

Is the fuse blown (open)?

YES>>

Replace the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).

NO>>

GO TO 2.

CHECK SECOND ROW SEAT CUSHION HEATER LH POWER SUPPLY VOLTAGE

1. Disconnect second row seat cushion heater LH connector.

2. Start the engine.

3. Check voltage between second row seat cushion heater LH harness connector and ground.

   +		-	Voltage (Approx.)
   Second row seat cushion heater LH
   Connector	Terminal
   B547	1	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair the harness or connector.

CHECK SECOND ROW SEAT CUSHION HEATER LH GROUND CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Check continuity between second row seat cushion heater LH harness connector and ground.

   Second row seat cushion heater LH		—	Continuity
   Connector	Terminal
   B547	4	Ground	Yes

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair the harness or connector.

CHECK SECOND ROW SEAT CUSHION HEATER LH LIN SIGNAL

1. Ignition switch ON.

2. Confirm output waveform between second row seat cushion heater LH harness connector and ground with oscilloscope.

   +		-	Output waveform
   Second row seat cushion heater LH
   Connector	Terminal
   B547	2	Ground

Is the inspection result normal?

YES>>

Replace second row seat cushion heater LH. Refer to Removal and Installation.

NO>>

GO TO 5.

CHECK SECOND ROW SEAT CUSHION HEATER LH LIN SIGNAL CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between second row seat cushion heater LH harness connector and A/C auto amp. harness connector.

   Second row seat cushion heater LH		A/C auto amp.		Continuity
   Connector	Terminal	Connector	Terminal
   B547	2	M60	45	Yes

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair the harness or connector.

CHECK SECOND ROW SEAT CUSHION HEATER LH LIN SIGNAL CIRCUIT (SHORT TO GROUND)

1. Disconnect the following connectors:

   • Front seat heater LH

   • Front seat heater RH

   • Second row seat cushion heater RH

2. Check continuity between second row seat cushion heater LH harness connector and ground.

   Second row seat cushion heater LH		—	Continuity
   Connector	Terminal
   B547	2	Ground	No

Is the inspection result normal?

YES>>

Replace A/C auto amp. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

Front Seat Heater Lh Nissan Pathfinder Fifth generation

Component Function Check

CHECK FRONT SEAT HEATER LH FUNCTION

1. Start the engine.

2. Check that seat cushion and seat back of front seat LH warms when operating the front heated seat switch LH.

Is the inspection result normal?

YES>>

Front seat heater LH function is OK.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK FUSE

1. Ignition switch OFF.

2. Check that the following fuse is not blown (open):

   Signal name	Fuse No.	Capacity
   Front seat heater LH power supply	66	30A

Is the fuse blown (open)?

YES>>

Replace the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).

NO>>

GO TO 2.

CHECK FRONT SEAT HEATER LH POWER SUPPLY VOLTAGE

1. Disconnect front seat heater LH connector.

2. Start the engine.

3. Check voltage between front seat heater LH harness connector and ground.

   With heated seat

   +		-	Voltage (Approx.)
   Front seat heater LH
   Connector	Terminal
   B230	1	Ground	Battery voltage

   With climate controlled seat

   +		-	Voltage (Approx.)
   Front seat heater LH
   Connector	Terminal
   B232	2	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair the harness or connector.

CHECK FRONT SEAT HEATER LH GROUND CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Check continuity between front seat heater LH harness connector and ground.

   With heated seat

   Front seat heater LH		—	Continuity
   Connector	Terminal
   B230	4	Ground	Yes

   With climate controlled seat

   Front seat heater LH		—	Continuity
   Connector	Terminal
   B232	1	Ground	Yes
   	5

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair the harness or connector.

CHECK FRONT SEAT HEATER LH LIN SIGNAL

1. Ignition switch ON.

2. Confirm output waveform between front seat heater LH harness connector and ground with oscilloscope.

   With heated seat

   +		-	Output waveform
   Front seat heater RH
   Connector	Terminal
   B230	2	Ground

   With climate controlled seat

   +		-	Output waveform
   Front seat heater RH
   Connector	Terminal
   B232	6	Ground

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

GO TO 5.

CHECK FRONT SEAT HEATER LH LIN SIGNAL CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between front seat heater LH harness connector and A/C auto amp. harness connector.

   With heated seat

   Front seat heater LH		A/C auto amp.		Continuity
   Connector	Terminal	Connector	Terminal
   B230	2	M60	45	Yes

   With climate controlled seat

   Front seat heater LH		A/C auto amp.		Continuity
   Connector	Terminal	Connector	Terminal
   B232	6	M60	45	Yes

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair the harness or connector.

CHECK FRONT SEAT HEATER LH LIN SIGNAL CIRCUIT (SHORT TO GROUND)

1. Disconnect the following connectors:

   • Front seat heater RH

   • Second row seat cushion heater LH

   • Second row seat cushion heater RH

2. Check continuity between front seat heater LH harness connector and ground.

   With heated seat

   Front seat heater LH		—	Continuity
   Connector	Terminal
   B230	2	Ground	No

   With climate controlled seat

   Front seat heater LH		—	Continuity
   Connector	Terminal
   B232	6	Ground	No

Is the inspection result normal?

YES>>

Replace A/C auto amp. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

CHECK FRONT SEAT BACK HEATER LH CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect front seat back heater LH connector.

3. Check continuity between front seat back heater LH harness connector and front seat heater LH harness connector.

   With heated seat

   Front seat back heater LH		Front seat heater LH		Continuity
   Connector	Terminal	Connector	Terminal
   B235	2	B231	1	Yes

   With climate controlled seat

   Front seat back heater LH		Front seat heater LH		Continuity
   Connector	Terminal	Connector	Terminal
   B237	2	B236	2	Yes

Is the inspection result normal?

YES>>

GO TO 8.

NO>>

Replace seat cushion heater LH. Refer to Seat Cushion.

CHECK FRONT SEAT BACK HEATER LH GROUND CIRCUIT (OPEN)

Check continuity between front seat back heater LH harness connector and front seat heater LH harness connector.

With heated seat

Front seat back heater LH		Front seat heater LH		Continuity
Connector	Terminal	Connector	Terminal
B235	1	B231	4	Yes

With climate controlled seat

Front seat back heater LH		Front seat heater LH		Continuity
Connector	Terminal	Connector	Terminal
B237	1	B236	5	Yes

Is the inspection result normal?

YES>>

Replace front seat back heater LH. Refer to Seat Back.

NO>>

Replace seat cushion heater LH. Refer to Seat Cushion.

Second Row Seat Heater Lh Nissan Pathfinder

Component Function Check

CHECK SECOND ROW SEAT HEATER LH FUNCTION

1. Start the engine.

2. Check that seat cushion and seat back of second row seat LH warms when operating the second row heated seat switch LH.

Is the inspection result normal?

YES>>

Second row seat heater LH function is OK.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK FUSE

1. Ignition switch OFF.

2. Check that the following fuse is not blown (open):

   Signal name	Fuse No.	Capacity
   Second row seat cushion heater LH power supply	66	30A

Is the fuse blown (open)?

YES>>

Replace the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).

NO>>

GO TO 2.

CHECK SECOND ROW SEAT CUSHION HEATER LH POWER SUPPLY VOLTAGE

1. Disconnect second row seat cushion heater LH connector.

2. Start the engine.

3. Check voltage between second row seat cushion heater LH harness connector and ground.

   +		-	Voltage (Approx.)
   Second row seat cushion heater LH
   Connector	Terminal
   B547	1	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair the harness or connector.

CHECK SECOND ROW SEAT CUSHION HEATER LH GROUND CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Check continuity between second row seat cushion heater LH harness connector and ground.

   Second row seat cushion heater LH		—	Continuity
   Connector	Terminal
   B547	4	Ground	Yes

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair the harness or connector.

CHECK SECOND ROW SEAT CUSHION HEATER LH LIN SIGNAL

1. Ignition switch ON.

2. Confirm output waveform between second row seat cushion heater LH harness connector and ground with oscilloscope.

   +		-	Output waveform
   Second row seat cushion heater LH
   Connector	Terminal
   B547	2	Ground

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

GO TO 5.

CHECK SECOND ROW SEAT CUSHION HEATER LH LIN SIGNAL CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between second row seat cushion heater LH harness connector and A/C auto amp. harness connector.

   Second row seat cushion heater LH		A/C auto amp.		Continuity
   Connector	Terminal	Connector	Terminal
   B547	2	M60	45	Yes

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair the harness or connector.

CHECK SECOND ROW SEAT CUSHION HEATER LH LIN SIGNAL CIRCUIT (SHORT TO GROUND)

1. Disconnect the following connectors:

   • Front seat heater LH

   • Front seat heater RH

   • Second row seat cushion heater RH

2. Check continuity between second row seat cushion heater LH harness connector and ground.

   Second row seat cushion heater LH		—	Continuity
   Connector	Terminal
   B547	2	Ground	No

Is the inspection result normal?

YES>>

Replace A/C auto amp. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

CHECK SECOND ROW SEAT BACK HEATER LH CIRCUIT (OPEN) 1

1. Ignition switch OFF

2. Disconnect second row seat back heater LH connector.

3. Check continuity between second row seat back heater LH harness connector and second row seat cushion heater LH harness connector.

   Second row seat back heater LH		Second row seat cushion heater LH		Continuity
   Connector	Terminal	Connector	Terminal
   B526	2	B547	3	Yes

Is the inspection result normal?

YES>>

GO TO 8.

NO>>

Repair the harness or connector.

CHECK SECOND ROW SEAT BACK HEATER LH CIRCUIT (OPEN) 2

Check continuity between second row seat cushion heater LH harness connector and second row seat cushion heater LH harness connector.

Second row seat cushion heater LH				Continuity
Connector	Terminal	Connector	Terminal
B548	3	B548	1	Yes

Is the inspection result normal?

YES>>

GO TO 9.

NO>>

Replace second row seat cushion heater LH. Refer to Removal and Installation.

CHECK SECOND ROW SEAT BACK HEATER LH GROUND CIRCUIT (OPEN)

Check continuity between second row seat back heater LH harness connector and ground.

Second row seat back heater LH		—	Continuity
Connector	Terminal
B526	1	Ground	Yes

Is the inspection result normal?

YES>>

Replace second row seat back heater LH. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

Seat Blower Lh Nissan Pathfinder 2025

Component Function Check

CHECK FRONT SEAT HEATER LH FUNCTION

1. Start the engine.

2. Check that seat cushion heater and seat back heater of the front seat LH warms when operating the front heated seat switch LH.

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Refer to Diagnosis Procedure.

CHECK SEAT BLOWER LH FUNCTION

1. Start the engine.

2. Check that there is ventilation from the seat cushion blower and seat back blower when operating the climate controlled seat switch LH.

Is the inspection result normal?

YES>>

Seat blower LH function is OK.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK FUSE

1. Ignition switch OFF.

2. Check that the following fuse is not blown (open):

   Signal name	Fuse No.	Capacity
   Seat blower LH power supply	66	30A

Is the fuse blown (open)?

YES>>

Replace the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).

NO>>

GO TO 2.

CHECK SEAT BLOWER LH POWER SUPPLY VOLTAGE

1. Disconnect seat cushion blower LH connector and seat back blower LH connector.

2. Start the engine.

3. Check voltage between seat cushion blower LH harness connector, seat back blower LH harness connector and ground.

   Seat cushion blower

   +		-	Voltage (Approx.)
   Seat cushion blower LH
   Connector	Terminal
   B233	3	Ground	Battery voltage

   Seat back blower

   +		-	Voltage (Approx.)
   Seat back blower LH
   Connector	Terminal
   B234	3	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair the harness or connector.

CHECK SEAT BLOWER LH GROUND CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Check continuity between seat cushion blower LH harness connector, seat back blower LH harness connector and ground.

   Seat cushion blower

   Seat cushion blower LH		—	Continuity
   Connector	Terminal
   B233	1	Ground	Yes

   Seat back blower

   Seat back blower LH		—	Continuity
   Connector	Terminal
   B234	1	Ground	Yes

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair the harness or connector.

CHECK SEAT BLOWER LH SIGNAL

1. Ignition switch ON.

2. Confirm output waveform between seat cushion blower LH harness connector, seat back blower LH harness connector and ground with oscilloscope.

   Seat cushion blower

   +		-	Output waveform
   Seat cushion blower LH
   Connector	Terminal
   B233	2	Ground

   Seat back blower

   +		-	Output waveform
   Seat back blower LH
   Connector	Terminal
   B234	2	Ground

Is the inspection result normal?

YES>>

Replace corresponding seat blower LH. Refer to Removal and Installation (seat back blower) or Removal and Installation (seat cushion blower).

NO>>

GO TO 5.

CHECK SEAT BLOWER LH SIGNAL CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect front seat heater LH connector.

3. Check continuity between seat cushion blower LH harness connector, seat back blower LH harness connector and front seat heater LH harness connector.

   Seat cushion blower

   Seat cushion blower LH		Front seat heater LH		Continuity
   Connector	Terminal	Connector	Terminal
   B233	2	B232	4	Yes

   Seat cushion blower

   Seat back blower LH		Front seat heater LH		Continuity
   Connector	Terminal	Connector	Terminal
   B234	2	B232	4	Yes

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair the harness or connector.

CHECK SEAT BLOWER LH SIGNAL CIRCUIT (SHORT TO GROUND)

Check continuity between seat cushion blower LH harness connector, seat back blower LH harness connector and ground.

Seat cushion blower

Seat cushion blower LH		—	Continuity
Connector	Terminal
B233	2	Ground	No

Seat back blower

Seat cushion blower LH		—	Continuity
Connector	Terminal
B234	2	Ground	No

Is the inspection result normal?

YES>>

Replace seat cushion heater LH. Refer to Seat Cushion.

NO>>

Repair the harness or connector.

Walk in Switch Nissan Pathfinder 2022

Component Function Check

CHECK WALK IN SWITCH FUNCTION

1. Open door.

2. Ignition switch ON.

3. Check that the second row seat power walk in system operates when using the walk in side switch and walk in back switch.

Is the inspection result normal?

YES>>

Walk in switch function is OK.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK WALK IN SWITCH SIGNAL CIRCUIT

1. Open door.

2. Ignition switch OFF.

3. Disconnect walk in side switch (left) connector, walk in side switch (right) connector, walk in back switch (left) connector and walk in back switch (right) connector.

4. Ignition switch ON.

5. Check voltage between walk in side switch (left) harness connector, walk in side switch (right) harness connector, walk in back switch (left) harness connector, walk in back switch (right) harness connector and ground.

   Walk in side switch

   (+)			(-)	Voltage (Approx.)
   Walk in side switch
   Connector		Terminal
   LH	B528	2	Ground	Battery voltage
   RH	B561

   Walk in back switch

   (+)			(-)	Voltage (Approx.)
   Walk in back switch
   Connector		Terminal
   LH	B529	2	Ground	Battery voltage
   RH	B562

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

GO TO 2.

CHECK WALK IN SWITCH SIGNAL CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect second row seat power walk in control unit connector.

3. Check continuity between walk in side switch (left) harness connector, walk in side switch (right) harness connector, walk in back switch (left) harness connector, walk in back switch (right) harness connector and second row seat power walk in control unit harness connector.

   Walk in side switch

   Walk in side switch			Second row seat power walk in control unit		Continuity
   Connector		Terminal	Connector	Terminal
   LH	B528	2	B555	5	Yes
   RH	B561			21

   Walk in back switch

   Walk in back switch			Second row seat power walk in control unit		Continuity
   Connector		Terminal	Connector	Terminal
   LH	B529	2	B555	20	Yes
   RH	B562			13

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair the harness or connector.

CHECK WALK IN SWITCH SIGNAL CIRCUIT (SHORT TO GROUND)

Check continuity between walk in side switch (left) harness connector, walk in side switch (right) harness connector, walk in back switch (left) harness connector, walk in back switch (right) harness connector and ground.

Walk in side switch

Walk in side switch			(-)	Continuity
Connector		Terminal
LH	B528	2	Ground	No
RH	B561

Walk in back switch

Walk in back switch			(-)	Continuity
Connector		Terminal
LH	B529	2	Ground	No
RH	B562

Is the inspection result normal?

YES>>

Replace second row seat power walk in control unit. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

CHECK WALK IN SWITCH GROUND CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect second row seat power walk in control unit connector.

3. Check continuity between walk in side switch (left) harness connector, walk in side switch (right) harness connector, walk in back switch (left) harness connector, walk in back switch (right) harness connector and second row seat power walk in control unit harness connector.

   Walk in side switch

   Walk in side switch			Second row seat power walk in control unit		Continuity
   Connector		Terminal	Connector	Terminal
   LH	B528	1	B555	4	Yes
   RH	B561

   Walk in back switch

   Walk in back switch			Second row seat power walk in control unit		Continuity
   Connector		Terminal	Connector	Terminal
   LH	B529	1	B555	4	Yes
   RH	B562

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair the harness or connector.

CHECK WALK IN SWITCH

Check walk in switch. Refer to Component Inspection.

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Replace corresponding walk in switch. Refer to Removal and Installation (walk in side switch) or Removal and Installation (walk in back switch).

CHECK WALK IN SWITCH INDICATOR SIGNAL CIRCUIT

1. Connect walk in switch connector and second row seat power walk in control unit connector.

2. Fold the second row seat back flat using the manual adjuster.

3. Ignition switch ON.

4. Check voltage between walk in side switch (left) harness connector, walk in side switch (right) harness connector, walk in back switch (left) harness connector, walk in back switch (right) harness connector and ground while pressing the walk in switch.

   Walk in side switch

   (+)			(-)	Voltage (Approx.)
   Walk in side switch
   Connector		Terminal
   LH	B528	4	Ground	Blinking: 0 V <–> Battery voltage
   RH	B561

   Walk in back switch

   (+)			(-)	Voltage (Approx.)
   Walk in back switch
   Connector		Terminal
   LH	B529	4	Ground	Blinking: 0 V <–> Battery voltage
   RH	B562

Is the inspection result normal?

YES>>

GO TO 9.

NO>>

GO TO 7.

CHECK WALK IN SWITCH INDICATOR SIGNAL CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect walk in side switch (left) connector, walk in side switch (right) connector, walk in back switch (left) connector, walk in back switch (right) connector and second row seat power walk in control unit connector.

3. Check continuity between walk in side switch (left) harness connector, walk in side switch (right) harness connector, walk in back switch (left) harness connector, walk in back switch (right) harness connector and second row seat power walk in control unit harness connector.

   Walk in side switch

   Walk in side switch			Second row seat power walk in control unit		Continuity
   Connector		Terminal	Connector	Terminal
   LH	B528	4	B555	22	Yes
   RH	B561

   Walk in back switch

   Walk in back switch			Second row seat power walk in control unit		Continuity
   Connector		Terminal	Connector	Terminal
   LH	B529	4	B555	22	Yes
   RH	B562

Is the inspection result normal?

YES>>

GO TO 8.

NO>>

Repair the harness or connector.

CHECK WALK IN SWITCH INDICATOR CIRCUIT (SHORT TO GROUND)

Check continuity between walk in side switch (left) harness connector, walk in side switch (right) harness connector, walk in back switch (left) harness connector, walk in back switch (right) harness connector and ground.

Walk in side switch

Walk in side switch			(-)	Continuity
Connector		Terminal
LH	B528	4	Ground	No
RH	B561

Walk in back switch

Walk in back switch			(-)	Continuity
Connector		Terminal
LH	B529	4	Ground	No
RH	B562

Is the inspection result normal?

YES>>

Replace second row seat power walk in control unit. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

CHECK WALK IN SWITCH INDICATOR GROUND CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect walk in side switch (left) connector, walk in side switch (right) connector, walk in back switch (left) connector and walk in back switch (right) connector.

3. Check continuity between walk in side switch (left) harness connector, walk in side switch (right) harness connector, walk in back switch (left) harness connector, walk in back switch (right) harness connector and ground.

   Walk in side switch

   Walk in side switch			(-)	Continuity
   Connector		Terminal
   LH	B528	3	Ground	Yes
   RH	B561

   Walk in back switch

   Walk in back switch			(-)	Continuity
   Connector		Terminal
   LH	B529	3	Ground	Yes
   RH	B562

Is the inspection result normal?

YES>>

Replace corresponding walk in switch. Refer to Removal and Installation (walk in side switch) or Removal and Installation (walk in back switch).

NO>>

Repair the harness or connector.

Component Inspection

CHECK WALK IN SWITCH

1. Ignition switch OFF.

2. Disconnect walk in switch connector.

3. Check continuity between walk in switch terminals.

   Walk in switch		Condition	Continuity
   Terminal
   2	1	Pressed	Yes
   		Not pressed	No

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace corresponding walk in switch. Refer to Removal and Installation (walk in side switch) or Removal and Installation (walk in back switch).

Seat Angle Sensor Nissan Pathfinder R53

Component Function Check

CHECK SECOND ROW SEAT POWER WALK IN FUNCTION

1. Open door.

2. Ignition switch ON

3. Check that the second row seat power walk in system operates when using the walk in side switch or walk in back switch.

Is the inspection result normal?

YES>>

Seat angle sensor function is OK.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK SEAT ANGLE SENSOR SIGNAL CIRCUIT

1. Open door.

2. Ignition switch OFF.

3. Disconnect seat angle sensor (left) connector and seat angle sensor (right) connector.

4. Ignition switch ON.

5. Check voltage between seat angle sensor (left) harness connector, seat angle sensor (right) harness connector and ground.

   (+)			(-)	Voltage (Approx.)
   Seat angle sensor
   Connector		Terminal
   LH	B524	1	Ground	Battery voltage
   RH	B563

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

GO TO 2.

CHECK SEAT ANGLE SENSOR SIGNAL CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect second row seat power walk in control unit connector.

3. Check continuity between seat angle sensor (left) harness connector, seat angle sensor (right) harness connector and second row seat power walk in control unit harness connector.

   Seat angle sensor			Second row seat power walk in control unit		Continuity
   Connector		Terminal	Connector	Terminal
   LH	B524	1	B555	11	Yes
   RH	B563			10

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair the harness or connector.

CHECK SEAT ANGLE SENSOR SIGNAL CIRCUIT (SHORT TO GROUND)

Check continuity between seat angle sensor (left) harness connector, seat angle sensor (right) harness connector and ground.

Seat angle sensor			(-)	Continuity
Connector		Terminal
LH	B524	1	Ground	No
RH	B563

Is the inspection result normal?

YES>>

Replace second row seat power walk in control unit. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

CHECK SEAT ANGLE SENSOR GROUND CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect second row seat power walk in control unit connector.

3. Check continuity between seat angle sensor (left) harness connector, seat angle sensor (right) harness connector and second row seat power walk in control unit harness connector.

   Seat angle sensor			Second row seat power walk in control unit		Continuity
   Connector		Terminal	Connector	Terminal
   LH	B524	2	B555	2	Yes
   RH	B563			3

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair the harness or connector.

CHECK SEAT ANGLE SENSOR

Check seat angle sensor. Refer to Component Inspection.

Is the inspection result normal?

YES>>

Check intermittent incident. Refer to Intermittent Incident.

NO>>

Replace corresponding seat angle sensor. Refer to Exploded View.

Component Inspection

CHECK SEAT ANGLE SENSOR

1. Ignition switch OFF.

2. Disconnect seat angle sensor connector.

3. Check continuity between seat angle sensor terminals with the second row seat back folded flat and upright.

   Walk in switch		Condition	Continuity
   Terminal
   1	2	Flat	No
   		Upright	Yes

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace corresponding seat angle sensor. Refer to Exploded View.

Seat Walk in Motor Nissan Pathfinder R53

Component Function Check

CHECK SECOND ROW SEAT POWER WALK IN FUNCTION

1. Open door.

2. Ignition switch ON

3. Check that the second row seat power walk in system operates when using the walk in side switch or walk in back switch.

Is the inspection result normal?

YES>>

Seat walk in motor function is OK.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK SEAT WALK IN MOTOR POWER SUPPLY CIRCUIT

1. Open door.

2. Ignition switch OFF.

3. Disconnect seat walk in motor (left) connector and seat walk in motor (right) connector.

4. Ignition switch ON.

5. With operating the walk in switch, check voltage between seat walk in motor (left) harness connector, seat walk in motor (right) harness connector and ground.

   (+)			(-)	Condition		Voltage (Approx.)
   Seat walk in motor
   Connector		Terminal
   LH	B525	2	Ground	Walk in switch	Pressed	Battery voltage
   RH	B564				Released	0 V

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

GO TO 2.

CHECK SEAT WALK IN MOTOR POWER SUPPLY CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect second row seat power walk in control unit connector.

3. Check continuity between seat walk in motor (left) harness connector, seat walk in motor (right) harness connector and second row seat power walk in control unit harness connector.

   Seat walk in motor			Second row seat power walk in control unit		Continuity
   Connector		Terminal	Connector	Terminal
   LH	B525	2	B555	16	Yes
   RH	B564			8

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair the harness or connector.

CHECK SEAT WALK IN MOTOR POWER SUPPLY CIRCUIT (SHORT TO GROUND)

Check continuity between seat walk in motor (left) harness connector, seat walk in motor (right) harness connector and ground.

Seat walk in motor			(-)	Continuity
Connector		Terminal
LH	B525	2	Ground	No
RH	B564

Is the inspection result normal?

YES>>

Replace second row seat power walk in control unit. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

CHECK SEAT WALK IN MOTOR GROUND CIRCUIT (OPEN)

1. Ignition switch OFF.

2. Disconnect second row seat power walk in control unit connector.

3. Check continuity between seat walk in motor (left) harness connector, seat walk in motor (right) harness connector and second row seat power walk in control unit harness connector.

   Seat walk in motor			Second row seat power walk in control unit		Continuity
   Connector		Terminal	Connector	Terminal
   LH	B525	1	B555	1	Yes
   RH	B564			9

Is the inspection result normal?

YES>>

Replace corresponding seat walk in motor. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

Power Supply and Ground Circuit. Second Row Seat Power Walk in Control Unit Nissan Pathfinder

Diagnosis Procedure

CHECK FUSE

Check that the following fuse is not blown:

Terminal No.	Signal name	Fuse No.	Capacity
24	Battery power supply	58	15A

Is the fuse or fusible link blown?

YES>>

Replace the blown fuse after repairing the affected circuit.

NO>>

GO TO 2.

CHECK POWER SUPPLY CIRCUIT

1. Disconnect second row seat power walk in control unit connector.

2. Check voltage between second row seat power walk in control unit harness connector and ground.

   +		–	Voltage (Approx.)
   Second row seat power walk in control unit
   Connector	Terminal
   B555	24	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair harness or connector.

CHECK GROUND CIRCUIT

Check continuity between second row seat power walk in control unit harness connector and ground.

Second row seat power walk in control unit		—	Continuity
Connector	Terminal
B555	17	Ground	Yes

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Repair harness or connector.