Nissan Pathfinder: Dtc/circuit Diagnosis (B20c7-11 A/c Clutch ... B24a6-11 in-Vehicle Sensor)

• B20c7-11 A/c Clutch
• B20c7-15 A/c Clutch
• B2480-93 Rear Air Mix Door Motor
• B24a0-49 A/c Auto Amp.
• B24a1-16 A/c Amp. Power Supply
• B24a2-55 Configuration Not Implement
• B24a4-11 Intake Sensor
• B24a4-15 Intake Sensor
• B24a6-11 in-Vehicle Sensor

B20c7-11 A/c Clutch Nissan Pathfinder 2025

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
B20C7–11	A/C clutch (A/C clutch)	[CIRCUIT SHORT TO GROUND]	Diagnosis condition	When A/C switch is ON
			Signal (Terminal)	Magnetic clutch ON signal
			Threshold	Magnetic clutch ON signal circuit has a short to ground
			Diagnosis delay time	1 second or more

POSSIBLE CAUSE

• Harness or connectors (magnetic clutch ON signal circuit is shorted to ground)

• IPDM E/R

FAIL-SAFE

Inhibit A/C compressor (magnetic clutch) operation

DTC CONFIRMATION PROCEDURE

PERFORM SELF-DIAGNOSIS

CONSULT

1. Start the engine.

2. A/C switch ON.

3. Select “Self Diagnostic Result” mode of “IPDM E/R”.

4. Check DTC.

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 MAGNETIC CLUTCH ON SIGNAL CIRCUIT FOR SHORT

1. Ignition switch OFF.

2. Disconnect IPDM E/R connector and A/C compressor connector.

3. Check continuity between IPDM E/R harness connector and ground.

IPDM E/R		—	Continuity
Connector	Terminal
F24	65	Ground	No

Is the inspection result normal?

YES>>

Replace IPDM E/R. Refer to Removal and Installation.

NO>>

Repair harness or connector.

B20c7-15 A/c Clutch Nissan Pathfinder Fifth generation

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
B20C7–15	A/C clutch (A/C clutch)	[CIRC SHORT TO BATT OR OPEN]	Diagnosis condition	When A/C switch is ON
			Signal (Terminal)	Magnetic clutch ON signal
			Threshold	Magnetic clutch ON signal circuit has a short to power or open
			Diagnosis delay time	1 second or more

POSSIBLE CAUSE

• Harness or connectors (magnetic clutch ON signal circuit is shorted to battery or open)

• IPDM E/R

FAIL-SAFE

Inhibit A/C compressor (magnetic clutch) operation

DTC CONFIRMATION PROCEDURE

PERFORM SELF-DIAGNOSIS

CONSULT

1. Start the engine.

2. A/C switch ON.

3. Select “Self Diagnostic Result” mode of “IPDM E/R”.

4. Check DTC.

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 MAGNETIC CLUTCH ON SIGNAL CIRCUIT FOR OPEN

1. Ignition switch OFF.

2. Disconnect IPDM E/R connector and A/C compressor connector.

3. Check continuity between IPDM E/R harness connector and A/C compressor harness connector.

IPDM E/R		A/C compressor		Continuity
Connector	Terminal	Connector	Terminal
F24	65	F3	1	Yes

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair harness or connector.

CHECK MAGNETIC CLUTCH ON SIGNAL CIRCUIT FOR SHORT

Check voltage between IPDM E/R harness connector and ground.

+		−	Voltage (Approx.)
IPDM E/R
Connector	Terminal
F24	65	Ground	0 V

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair harness or connector.

CHECK MAGNETIC CLUTCH GROUND CIRCUIT FOR OPEN

Check continuity between A/C compressor harness connector and ground.

A/C compressor		—	Continuity
Connector	Terminal
F3	2	Ground	Yes

Is the inspection result normal?

YES>>

Replace IPDM E/R. Refer to Removal and Installation.

NO>>

Repair harness or connector.

B2480-93 Rear Air Mix Door Motor Nissan Pathfinder SUV

DTC Description

DTC DETECTION LOGIC

NOTE:

If all of door motors DTC (B2480-93*, B24F5-93, B24F6-93, B24F7-93, B24F8-93) are detected, check “DOOR MOTOR”. Refer to Diagnosis Procedure.

*: With rear air control

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
B2480-93	Rear air mix door motor (Rear air mix door motor)	Diagnosis condition	Ignition switch ON
		Signal (Terminal)	LIN (door motor) signal
		Threshold	Drive error of air mix door motor (rear) is detected
		Diagnosis delay time	1 second or more

POSSIBLE CAUSE

• Harness and connector [air mix door motor (rear) circuit is open or shorted to ground]

• Air mix door motor (rear) installation condition

• Air mix door motor (rear)

• A/C auto amp.

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM SELF-DIAGNOSIS

CONSULT

1. Start the engine.

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

3. Check DTC.

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 AIR MIX DOOR MOTOR (REAR) POWER SUPPLY

1. Ignition switch ON.

2. Check voltage between air mix door motor (rear) harness connector and ground.

Air mix door motor (rear)		—	Voltage (Approx.)
Connector	Terminal
B156	1	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

GO TO 5.

CHECK AIR MIX DOOR MOTOR (REAR) GROUND CIRCUIT FOR OPEN

1. Ignition switch OFF.

2. Disconnect air mix door motor (rear) connector.

3. Check continuity between air mix door motor (rear) harness connector and ground.

   Air mix door motor (rear)		—	Continuity
   Connector	Terminal
   B156	2	Ground	Yes

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair harness or connector.

CHECK AIR MIX DOOR MOTOR (REAR) LIN SIGNAL CIRCUIT

1. Connect air mix door motor (rear) connector.

2. Ignition switch ON.

3. Confirm output waveform between air mix door motor (rear) harness connector and ground with oscilloscope.

   Air mix door motor (rear)		—	Output waveform
   Connector	Terminal
   B156	3	Ground

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

GO TO 6.

CHECK INSTALLATION OF AIR MIX DOOR MOTOR (REAR)

Check air mix door motor (rear) is properly installed. Refer to Exploded View.

Is the inspection result normal?

YES>>

Replace air mix door motor (rear). Refer to Removal and Installation - Air Mix Door Motor (Rear).

NO>>

Repair or replace malfunctioning part.

CHECK AIR MIX DOOR MOTOR (REAR) POWER SUPPLY CIRCUIT FOR OPEN

1. Ignition switch OFF.

2. Disconnect air mix door motor (rear) connector and A/C auto amp. connector.

3. Check continuity between air mix door motor (rear) harness connector and A/C auto amp. harness connector.

   Air mix door motor (rear)		A/C auto amp.		Continuity
   Connector	Terminal	Connector	Terminal
   B156	1	M50	1	Yes

Is the inspection result normal?

YES>>

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

NO>>

Repair harness or connector.

CHECK AIR MIX DOOR MOTOR (REAR) LIN SIGNAL CIRCUIT FOR OPEN

1. Ignition switch OFF.

2. Disconnect air mix door motor (rear) connector and A/C auto amp. connector.

3. Check continuity between air mix door motor (rear) harness connector and A/C auto amp. harness connector.

   Air mix door motor (rear)		A/C auto amp.		Continuity
   Connector	Terminal	Connector	Terminal
   B156	3	M50	2	Yes

Is the inspection result normal?

YES>>

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

NO>>

Repair harness or connector.

B24a0-49 A/c Auto Amp. Nissan Pathfinder 2022

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
B24A0-49	A/C AUTO AMP. (Air conditioning automatic amplifier)	Diagnosis condition	Ignition switch ON
		Signal (Terminal)	—
		Threshold	A malfunction is detected in A/C auto amp. internal EEPROM memory functions.
		Diagnosis delay time	2 second or more

POSSIBLE CAUSE

A/C auto amp.

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM SELF-DIAGNOSIS

CONSULT

1. Ignition switch ON.

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

3. Check DTC.

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

REPLACE A/C AUTO AMP.

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

>>

Inspection End.

B24a1-16 A/c Amp. Power Supply Nissan Pathfinder 2022

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
B24A1-16	A/C AUTO AMP. POWER SUPPLY (Air conditioning automatic amplifier power supply)	Diagnosis condition	Ignition switch ON
		Signal (Terminal)	Accessory power supply
		Threshold	Open or shorted to ground
		Diagnosis delay time	30 seconds or more

POSSIBLE CAUSE

• A/C auto amp.

• Harness or connector (accessory power supply circuits is open or shorted to ground)

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM SELF-DIAGNOSIS

CONSULT

1. Ignition switch ON.

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

3. Check DTC.

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 A/C AUTO AMP. POWER SUPPLY AND GROUND CIRCUITS

Check A/C auto amp. power supply and ground circuits. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

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

NO>>

Repair or replace malfunctioning parts.

B24a2-55 Configuration Not Implement Nissan Pathfinder 2022

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
B24A2-55	Configuration not implement (Configuration not implement)	Diagnosis condition	Ignition switch ON
		Signal (Terminal)	—
		Threshold	Nissan Pathfinder Vehicle specification is not written
		Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

Configuration is not completed

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM SELF-DIAGNOSIS

CONSULT

1. Ignition switch ON.

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

3. Check DTC.

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

PERFORM CONFIGURATION

Perform configuration. Refer to Description.

>>

Inspection End.

B24a4-11 Intake Sensor Nissan Pathfinder 2022

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
B24A4-11	INTAKE SENSOR (Intake sensor)	Diagnosis condition	Ignition switch ON
		Signal (Terminal)	Intake sensor signal
		Threshold	The intake sensor recognition temperature is too high [more than 212°F (100°C)]
		Diagnosis delay time	2 second or more

POSSIBLE CAUSE

• Intake sensor

• A/C auto amp.

• Harness or connectors (the sensor circuit is shorted to ground)

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

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

3. Check DTC.

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 INTAKE SENSOR SIGNAL

1. Ignition switch ON.

2. Check voltage between A/C auto amp. harness connector.

   A/C auto amp.			Voltage (Approx.)
   Connector	Terminals
   	+	-
   M50	23	26

Is the inspection result normal?

YES>>

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

NO>>

GO TO 2.

CHECK INTAKE SENSOR POWER SUPPLY

1. Ignition switch OFF.

2. Disconnect intake sensor connector.

3. Ignition switch ON.

4. Check voltage between intake sensor harness connector and ground.

   +		-	Voltage (Approx.)
   Intake sensor
   Connector	Terminal
   M145	2	Ground	5 V

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

GO TO 4.

CHECK INTAKE SENSOR

Check intake sensor. Refer to Component Inspection.

Is the inspection result normal?

YES>>

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

NO>>

Replace intake sensor. Refer to Removal and Installation.

CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR SHORT

1. Ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between intake sensor harness connector and ground.

   Intake sensor		—	Continuity
   Connector	Terminal
   M145	2	Ground	No

Is the inspection result normal?

YES>>

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

NO>>

Repair harness or connector.

Component Inspection

CHECK INTAKE SENSOR

1. Ignition switch OFF.

2. Replace intake sensor. Refer to Removal and Installation.

3. Check resistance between intake sensor terminals. Refer to applicable table for the normal value.

   Intake sensor		Condition	Resistance: kΩ
   Terminals		Temperature: °F (°C)
   1	2	−4 (−20)	23.60
   		14 (−10)	13.46
   		32 (0)	8.00
   		50 (10)	4.93
   		68 (20)	3.14
   		77 (25)	2.54
   		86 (30)	2.06
   		104 (40)	1.39

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace intake sensor. Refer to Removal and Installation.

B24a4-15 Intake Sensor Nissan Pathfinder SUV

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
B24A4-15	INTAKE SENSOR (Intake sensor)	Diagnosis condition	Ignition switch ON
		Signal (Terminal)	Intake sensor signal
		Threshold	The intake sensor recognition temperature is too low [less than -44°F (-42°C)]
		Diagnosis delay time	2 second or more

POSSIBLE CAUSE

• Intake sensor

• A/C auto amp.

• Harness or connectors (the sensor circuit is open or shorted to battery)

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

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

3. Check DTC.

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 INTAKE SENSOR SIGNAL

1. Ignition switch ON.

2. Check voltage between A/C auto amp. harness connector.

   A/C auto amp.			Voltage (Approx.)
   Connector	Terminals
   	+	-
   M50	23	26

Is the inspection result normal?

YES>>

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

NO>>

GO TO 2.

CHECK INTAKE SENSOR POWER SUPPLY

1. Ignition switch OFF.

2. Disconnect intake sensor connector.

3. Ignition switch ON.

4. Check voltage between intake sensor harness connector and ground.

   +		-	Voltage (Approx.)
   Intake sensor
   Connector	Terminal
   M145	2	Ground	5 V

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

GO TO 5.

CHECK INTAKE SENSOR GROUND CIRCUIT FOR OPEN

1. Ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between intake sensor harness connector and A/C auto amp. harness connector.

   Intake sensor		A/C auto amp.		Continuity
   Connector	Terminal	Connector	Terminal
   M145	1	M50	26	Yes

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair harness or connector.

CHECK INTAKE SENSOR

Check intake sensor. Refer to Component Inspection.

Is the inspection result normal?

YES>>

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

NO>>

Replace intake sensor. Refer to Removal and Installation.

CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR OPEN

1. Ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between intake sensor harness connector and A/C auto amp. harness connector.

   Intake sensor		A/C auto amp.		Continuity
   Connector	Terminal	Connector	Terminal
   M145	2	M50	23	Yes

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair harness or connector.

CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR SHORT

Check voltage between intake sensor harness connector and ground.

+		-	Voltage (Approx.)
Intake sensor
Connector	Terminal
M145	2	Ground	0 V

Is the inspection result normal?

YES>>

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

NO>>

Repair harness or connector.

Component Inspection

CHECK INTAKE SENSOR

1. Ignition switch OFF.

2. Replace intake sensor. Refer to Removal and Installation.

3. Check resistance between intake sensor terminals. Refer to applicable table for the normal value.

   Intake sensor		Condition	Resistance: kΩ
   Terminals		Temperature: °F (°C)
   1	2	−4 (−20)	23.60
   		14 (−10)	13.46
   		32 (0)	8.00
   		50 (10)	4.93
   		68 (20)	3.14
   		77 (25)	2.54
   		86 (30)	2.06
   		104 (40)	1.39

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace intake sensor. Refer to Removal and Installation.

B24a6-11 in-Vehicle Sensor Nissan Pathfinder 2025

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
B24A6-11	IN-Nissan Pathfinder Vehicle SENSOR (In-vehicle sensor)	Diagnosis condition	Ignition switch ON
		Signal (Terminal)	In-Nissan Pathfinder vehicle sensor signal
		Threshold	The in-Nissan Pathfinder vehicle sensor recognition temperature is too high [more than 212°F (100°C)]
		Diagnosis delay time	2 second or more

POSSIBLE CAUSE

• Front in-vehicle sensor

• A/C auto amp.

• Harness or connectors (the sensor circuit is shorted to ground)

FAIL-SAFE

In-vehicle temperature is calculated as 77°F (25°C) and air conditioning system is controlled.

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

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

3. Check DTC.

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 IN-VEHICLE SENSOR SIGNAL

1. Ignition switch ON.

2. Check voltage between A/C auto amp. harness connector.

   A/C auto amp.			Voltage (Approx.)
   Connector	Terminals
   	+	-
   M60	48	78

Is the inspection result normal?

YES>>

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

NO>>

GO TO 2.

CHECK FRONT IN-Nissan Pathfinder Vehicle SENSOR POWER SUPPLY

1. Ignition switch OFF.

2. Disconnect front in-vehicle sensor connector.

3. Ignition switch ON.

4. Check voltage between front in-Nissan Pathfinder vehicle sensor harness connector and ground.

   +		-	Voltage (Approx.)
   Front in-Nissan Pathfinder vehicle sensor
   Connector	Terminal
   M102	1	Ground	5 V

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

GO TO 4.

CHECK FRONT IN-Nissan Pathfinder Vehicle SENSOR

Check front in-vehicle sensor. Refer to Component Inspection.

Is the inspection result normal?

YES>>

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

NO>>

Replace front in-Nissan Pathfinder vehicle sensor. Refer to Removal and Installation.

CHECK FRONT IN-Nissan Pathfinder Vehicle SENSOR POWER SUPPLY CIRCUIT FOR SHORT

1. Ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between front in-Nissan Pathfinder vehicle sensor harness connector and ground.

   Front in-Nissan Pathfinder vehicle sensor		—	Continuity
   Connector	Terminal
   M102	1	Ground	No

Is the inspection result normal?

YES>>

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

NO>>

Repair harness or connector.

Component Inspection

CHECK FRONT IN-VEHICLE SENSOR

1. Ignition switch OFF.

2. Remove front in-Nissan Pathfinder vehicle sensor. Refer to Removal and Installation.

3. Check resistance between front in-vehicle sensor terminals. Refer to applicable table for the normal value.

   Front in-Nissan Pathfinder vehicle sensor		Condition	Resistance: kΩ
   Terminals		Temperature: °F (°C)
   1	2	−4 (−20)	16.50
   		14 (−10)	9.92
   		32 (0)	6.19
   		50 (10)	3.99
   		68 (20)	2.65
   		77 (25)	2.19
   		86 (30)	1.81
   		104 (40)	1.27

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace front in-Nissan Pathfinder vehicle sensor. Refer to Removal and Installation.