Nissan Pathfinder: Dtc/circuit Diagnosis (B242a-98 Closure Motor ... Automatic Back Door Serial Communication)

• B242a-98 Closure Motor
• B2436-11 Spindle Motor Lh
• B2436-12 Spindle Motor Lh
• B2436-98 Spindle Motor Lh
• B2f06-11 Trunk/back Door Opener Sw
• U0075-00 Communication Bus C Off
• U2140-87 Can Ecm
• U2141-87 Communication Lost with Atcu
• Automatic Back Door Close Switch
• Automatic Back Door Serial Communication

B242a-98 Closure Motor Nissan Pathfinder Fifth generation

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
B242A-98	Closure motor (Closure motor)	Diagnosis condition	When back door closure function operate
		Signal (terminal)	—
		Threshold	When thermal protection operate of the closure motor
		Diagnosis delay time	20 seconds or more

POSSIBLE CAUSE

• Back door lock assembly (closure motor)

• Continuous operation of the closure motor

• Automatic back door control unit

FAIL-SAFE

Inhibit automatic back door system all function

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON and wait for 20 seconds or more.

2. Operate automatic back door.

3. Check “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

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 SELF DIAGNOSTIC RESULT

CONSULT

1. Wait for 40 seconds or more.

2. Ignition switch ON.

3. Select “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

What is the display history of DTC “B242A-98”?

“CRNT”>>

GO TO 2.

“PAST”>>

Inspection End.

CHECK CONNECTOR

1. Ignition switch OFF.

2. Check the automatic back door control unit harness connector for disconnection or looseness.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair/replace harness or connector, securely lock the connector.

CHECK AUTOMATIC BACK DOOR CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

Check the automatic back door control unit power supply and ground circuits. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair/replace harness, connector, fuse, or fusible link.

CHECK TERMINAL

1. Ignition switch OFF.

2. Disconnect automatic back door control unit harness connector and then check the automatic back door control unit pin terminals for damage or loose connection with harness connector.

Is the inspection result normal?

YES>>

Replace automatic back door control unit. Refer to Removal and Installation.

NO>>

Repair/replace harness, connector, or terminal.

B2436-11 Spindle Motor Lh Nissan Pathfinder SUV

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
B2436-11	Spindle motor LH (Spindle motor left hand)	Diagnosis condition	All times
		Signal (terminal)	Spindle motor LH signal
		Threshold	Automatic back door control unit cannot detect the spindle motor LH signal
		Diagnosis delay time	1 second or less

POSSIBLE CAUSE

• Harness or connector (spindle motor LH circuit is ground open)

• Automatic back door control unit

• Spindle unit LH

FAIL-SAFE

Inhibit automatic back door system (only operate back door closure function)

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Check “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

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 SPINDLE MOTOR INPUT SIGNAL

Check signal between spindle unit LH harness connector and ground using oscilloscope.

(+)		(–)	Condition		Signal (Reference value)
Spindle unit LH
Connector	Terminal
B70	1	Ground	Back door	Auto open operation
				Auto close operation	0 – 1 V
	7			Auto close operation
				Auto open operation	0 – 1 V

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

GO TO 5.

CHECK CONNECTOR

1. Ignition switch OFF.

2. Check the automatic back door control unit harness connector for disconnection or looseness.

3. Check the spindle unit LH harness connector for disconnection or looseness.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair/replace harness or connector, securely lock the connector, and GO TO 5.

CHECK AUTOMATIC BACK DOOR CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

Check the automatic back door control unit power supply and ground circuits. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair/replace harness, connector, fuse, or fusible link, and GO TO 5.

CHECK TERMINAL

1. Ignition switch OFF.

2. Disconnect automatic back door control unit harness connector and then check the automatic back door control unit pin terminals for damage or loose connection with harness connector.

3. Disconnect spindle unit LH harness connector and check spindle unit LH pin terminal for damage or loose connection with harness connector.

Is the inspection result normal?

YES>>

Replace automatic back door control unit. Refer to Removal and Installation.

NO>>

Repair/replace harness, connector, or terminal.

CHECK SPINDLE MOTOR CIRCUIT

1. Ignition switch OFF.

2. Disconnect automatic back door control unit connector and spindle unit LH connector.

3. Check continuity between automatic back door control unit harness connector and spindle unit LH harness connector.

   Automatic back door control unit		Spindle unit LH		Continuity
   Connector	Terminal	Connector	Terminal
   B56	38	B70	1	Yes
   	39		7

4. Check continuity between automatic back door control unit harness connector and ground.

   Automatic back door control unit		(-)	Continuity
   Connector	Terminal
   B56	38	Ground	No
   	39

Is the inspection result normal?

YES>>

Replace spindle unit LH. Refer to Removal and Installation.

NO>>

Repair or replace harness.

B2436-12 Spindle Motor Lh Nissan Pathfinder R53

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
B2436-12	Spindle motor LH (Spindle motor left hand)	Diagnosis condition	All times
		Signal (terminal)	Spindle motor LH signal
		Threshold	When automatic back door control unit detect power short of spindle motor LH circuit
		Diagnosis delay time	1 second or less

POSSIBLE CAUSE

• Harness or connector (spindle motor LH circuit is power short)

• Automatic back door control unit

• Spindle unit LH

FAIL-SAFE

Inhibit automatic back door system (only operate back door closure function)

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Check “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

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 SPINDLE MOTOR INPUT SIGNAL

Check signal between spindle unit LH harness connector and ground using oscilloscope.

(+)		(–)	Condition		Signal (Reference value)
Spindle unit LH
Connector	Terminal
B70	1	Ground	Back door	Auto open operation
				Auto close operation	0 – 1 V
	7			Auto close operation
				Auto open operation	0 – 1 V

Is the inspection result normal?

YES>>

Replace automatic back door control unit. Refer to Removal and Installation.

NO>>

GO TO 2.

CHECK SPINDLE MOTOR CIRCUIT

1. Disconnect automatic back door control unit connector and spindle unit LH connector.

2. Check voltage between automatic back door control unit harness connector and ground.

   Automatic back door control unit		—	Voltage (Approx.)
   Connector	Terminal
   B56	38	Ground	0 V
   	39

Is the inspection result normal?

YES>>

Replace spindle unit LH. Refer to Removal and Installation.

NO>>

Repair or replace harness.

B2436-98 Spindle Motor Lh Nissan Pathfinder 2022

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
B2436-98	Spindle motor LH (Spindle motor left hand)	Diagnosis condition	All times
		Signal (terminal)	—
		Threshold	When thermal protection operate of the spindle motor LH
		Diagnosis delay time	45 seconds or more

POSSIBLE CAUSE

Automatic back door control unit

FAIL-SAFE

Inhibit automatic back door system (only operate back door closure function)

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON and wait for 45 seconds or more.

2. Check “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

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 SELF DIAGNOSTIC RESULT

CONSULT

1. Wait for 75 seconds or more.

2. Ignition switch ON.

3. Select “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

What is the display history of DTC “B2436-98”?

“CRNT”>>

Replace automatic back door control unit. Refer to Removal and Installation.

“PAST”>>

Inspection End.

B2f06-11 Trunk/back Door Opener Sw Nissan Pathfinder 2025

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
B2F06-11	Back door/trunk opener switch (Back door/trunk opener switch)	Diagnosis condition	Ignition switch ON.
		Signal (terminal)	Back door opener switch signal (BCM connector terminal: 98)
		Threshold	When the BCM detects the open or shorted circuit of the back door opener switch
		Diagnosis delay time	1 second or less

POSSIBLE CAUSE

• Back door opener switch

• Harness or connectors (back door opener switch circuit is open or shorted)

• BCM

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

CHECK SELF-DIAG RESULT

CONSULT

1. Ignition switch ON.

2. Check “Self Diagnostic Result” mode of “BCM”.

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 BACK DOOR OPEN INPUT SIGNAL

1. Ignition switch OFF.

2. Disconnect back door opener switch connector.

3. Check voltage between back door opener switch harness connector and ground.

   (+)		(–)	Voltage (Approx.)
   Back door opener switch
   Connector	Terminal
   D559	1	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

GO TO 2.

CHECK BACK DOOR OPENER SWITCH CIRCUIT

1. Disconnect BCM connector.

2. Check continuity between BCM harness connector and back door opener switch harness connector.

   BCM		Back door opener switch		Continuity
   Connector	Terminal	Connector	Terminal
   B59	98	D559	1	Yes

3. Check continuity between BCM harness connector and ground.

   BCM		—	Continuity
   Connector	Terminal
   B59	98	Ground	No

Is the inspection result normal?

YES>>

Replace BCM. Refer to Removal and Installation.

NO>>

Repair or replace harness.

CHECK BACK DOOR OPENER SWITCH GROUND CIRCUIT

Check continuity between back door opener switch harness connector and ground.

Back door opener switch		—	Continuity
Connector	Terminal
D559	2	Ground	Yes

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace harness.

CHECK BACK DOOR OPENER SWITCH

Refer to Component Inspection.

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Replace back door opener switch. Refer to Removal and Installation.

CHECK INTERMITTENT INCIDENT

Refer to Intermittent Incident.

>>

Inspection End.

U0075-00 Communication Bus C Off Nissan Pathfinder Fifth generation

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
U0075-00	Control module comm Bus C Off (Control module communication Bus C Off)	Diagnosis condition	Ignition switch ON
		Signal (terminal)	CAN communication signal
		Threshold	Automatic back door control unit is unable to receive the CAN communication signal from the following control unit. IPDM E/R Combination meter ECM ABS actuator and electric unit (control unit)
		Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

Inhibit automatic back door system all function

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch OFF.

2. Ignition switch ON and wait for 2 seconds or more.

3. Check “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

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 CAN COMMUNICATION

Check CAN communication. Refer toTrouble Diagnosis Flow Chart

Is DTC “U0075-00” displayed?

YES>>

Repair or replace the malfunctioning part.

NO>>

Check intermittent incident. Refer to Intermittent Incident.

U2140-87 Can Ecm Nissan Pathfinder 2022

DTC Description

DESCRIPTION

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-Nissan Pathfinder vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern Nissan Pathfinder vehicles are equipped with many electronic control units, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-High line, CAN-Low line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only. CAN Communication Signal Chart. Refer to CAN Communication Signal Chart.

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
U2140-87	CAN ECM [CAN communication error (ECM)]	Diagnosis condition	Ignition switch ON
		Signal (terminal)	CAN communication signal
		Threshold	Transmission error or reception error
		Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

CHECK SELF-DIAG RESULT

CONSULT

1. Ignition switch ON and wait for 2 seconds or more.

2. Check “Self Diagnostic Result” mode of “HANDS FREE MODULE”.

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.

Diagnosis Procedure

CHECK CAN COMMUNICATION

Check CAN communication. Refer to Trouble Diagnosis Flow Chart.

Is DTC “U2140-87” displayed?

YES>>

Repair or replace the malfunctioning part.

NO>>

Check intermittent incident. Refer to Intermittent Incident.

U2141-87 Communication Lost with Atcu Nissan Pathfinder

DTC Description

DESCRIPTION

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-Nissan Pathfinder vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern Nissan Pathfinder vehicles are equipped with many electronic control units, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-High line, CAN-Low line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only. CAN Communication Signal Chart. Refer to CAN Communication Signal Chart.

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
U2141-87	Communication lost with ATCU [CAN communication error (TCM)]	Diagnosis condition	Ignition switch ON
		Signal (terminal)	CAN communication signal
		Threshold	Automatic back door control unit is unable to receive the CAN communications signal from TCM
		Diagnosis delay time	2 seconds or less

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

Inhibit automatic back door system all function

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch OFF.

2. Ignition switch ON and wait for 2 seconds or more.

3. Check “Self Diagnostic Result” mode of “AUTO BACK DOOR”.

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 CAN COMMUNICATION

Check CAN communication. Refer to Trouble Diagnosis Flow Chart.

Is DTC “U2141-87” displayed?

YES>>

GO TO 2.

NO>>

Check intermittent incident. Refer to Intermittent Incident.

CHECK CONNECTOR

1. Ignition switch OFF.

2. Check the automatic back door control unit harness connector for disconnection or looseness.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair/replace harness or connector, securely lock the connector.

CHECK AUTOMATIC BACK DOOR CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

Check the automatic back door control unit power supply and ground circuits. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair/replace harness, connector, fuse, or fusible link.

CHECK TERMINAL

1. Ignition switch OFF.

2. Disconnect automatic back door control unit harness connector and then check the automatic back door control unit pin terminals for damage or loose connection with harness connector.

Is the inspection result normal?

YES>>

Replace automatic back door control unit. Refer to Removal and Installation.

NO>>

Repair/replace harness, connector, or terminal.

Automatic Back Door Close Switch Nissan Pathfinder 2025

ComponentFunctionCheck

CHECK FUNCTION

CONSULT

1. Ignition switch ON.

2. Select “AUTO BACK DOOR".

3. Select “Automatic back door close SW” in “DATA MONITOR” mode.

4. Check that the function operates normally according to the following conditions.

Monitor item	Condition		Status
Automatic back door close SW	Automatic back door close switch	Pressed	On
		Released	Off

Is the inspection result normal?

YES>>

Automatic back door close switch is OK.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

CHECK AUTOMATIC BACK DOOR CLOSE SWITCH INPUT SIGNAL

1. Ignition switch OFF.

2. Disconnect automatic back door lock and close switch assembly connector.

3. Check voltage between automatic back door lock and close switch assembly harness connector and ground.

   (+)		(–)	Voltage (Approx.)
   Automatic back door lock and close switch assembly
   Connector	Terminal
   D551	11	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

GO TO 2.

CHECK AUTOMATIC BACK DOOR CLOSE SWITCH CIRCUIT

1. Disconnect automatic back door control unit connector.

2. Check continuity between automatic back door control unit harness connector and automatic back door lock and close switch assembly harness connector.

   Automatic back door control unit		Automatic back door lock and close switch assembly		Continuity
   Connector	Terminal	Connector	Terminal
   B55	3	D551	11	Yes

3. Check continuity between automatic back door control unit harness connector and ground.

   Automatic back door control unit		(-)	Continuity
   Connector	Terminal
   B55	3	Ground	No

Is the inspection result normal?

YES>>

Replace automatic back door control unit. Refer to Removal and Installation.

NO>>

Repair or replace harness.

CHECK AUTOMATIC BACK DOOR CLOSE SWITCH GROUND CIRCUIT

Check continuity between automatic back door lock and close switch assembly harness connector and ground.

Automatic back door lock and close switch assembly		(-)	Continuity
Connector	Terminal
D551	7	Ground	Yes

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace harness.

CHECK AUTOMATIC BACK DOOR CLOSE SWITCH

Refer to Component Inspection.

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Replace automatic back door lock and close switch assembly. Refer to Removal and Installation.

CHECK INTERMITTENT INCIDENT

Refer to Intermittent Incident.

>>

Inspection End.

Component Inspection

CHECK AUTOMATIC BACK DOOR CLOSE SWITCH

1. Ignition switch OFF.

2. Disconnect automatic back door lock and close switch assembly connector.

3. Check continuity between automatic back door lock and close switch assembly terminals.

Automatic back door lock and close switch assembly		Condition		Continuity
Terminal
11	7	Automatic back door close switch	Pressed	Yes
			Released	No

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace automatic back door lock and close switch assembly. Refer to Removal and Installation.

Automatic Back Door Serial Communication Nissan Pathfinder 2025

Diagnosis Procedure

CHECK AUTOMATIC BACK DOOR SERIAL COMMUNICATION SIGNAL

1. Ignition switch ON.

2. Check signal between BCM harness connector and ground using oscilloscope.

   (+)		(–)	Signal (Reference value)
   BCM
   Connector	Terminal
   B59	83	Ground

Is the inspection result normal?

YES>>

Inspection End.

NO>>

GO TO 2.

CHECK AUTOMATIC BACK DOOR SERIAL COMMUNICATION CIRCUIT

1. Ignition switch OFF.

2. Disconnect hands free sensor control unit connector and BCM connector.

3. Check continuity between hands free sensor control unit harness connector and BCM harness connector.

   Hands free sensor control unit		BCM		Continuity
   Connector	Terminal	Connector	Terminal
   B459	1	B59	83	Yes

4. Check continuity between hands free sensor control unit harness connector and ground.

   Hands free sensor control unit		(-)	Continuity
   Connector	Terminal
   B459	1	Ground	No

Is the inspection result normal?

YES>>

Replace BCM. Refer to Removal and Installation.

NO>>

Repair or replace harness.