Nissan Pathfinder: Defogger - Dtc/circuit Diagnosis

• Rear Window Defogger Switch
• Rear Window Defogger Relay
• Rear Window Defogger Power Supply and Ground Circuit
• Door Mirror Defogger Lh
• Heated Washer Nozzles

Rear Window Defogger Switch Nissan Pathfinder 5th Gen

Component Function Check

CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION

Check that the indicator lamp of rear window defogger illuminates with rear window defogger switch ON.

Is the inspection result normal?

YES>>

Rear window defogger switch function is OK.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

• The rear window defogger is operated by turning the rear window defogger switch ON.

• Turns the indicator lamp in the rear window defogger switch ON when operating the rear window defogger.

CHECK FRONT A/C SWITCH ASSEMBLY (REAR WINDOW DEFOGGER SWITCH) CIRCUIT

Operate the rear window defogger switch.

Is the inspection result normal?

YES>>

Inspection End.

NO>>

GO TO 2.

CHECK FRONT A/C SWITCH ASSEMBLY (REAR WINDOW DEFOGGER SWITCH) CIRCUIT VOLTAGE

1. Ignition switch ACC.

2. Check voltage between front A/C switch assembly harness connector and ground.

   (+)		(–)	Condition		Voltage (Approx.)
   Front A/C switch assembly
   Connector	Terminal
   M69	1	Ground	Ignition switch	ACC	Battery voltage
   				OFF	0 V

Is the inspection result normal?

YES>>

Replace front A/C switch assembly. Refer to Removal and Installation.

NO>>

GO TO 3.

CHECK FRONT A/C SWITCH ASSEMBLY (REAR WINDOW DEFOGGER SWITCH) CIRCUIT FOR SHORT

1. Ignition switch OFF.

2. Disconnect front A/C switch assembly connector.

3. Check continuity between front A/C switch assembly harness connector and ground.

   Front A/C switch assembly		—	Continuity
   Connector	Terminal
   M69	1	Ground	No

Is the inspection result normal?

YES>>

Check the following:

• Battery power supply circuit.

NO>>

Repair or replace harness.

Rear Window Defogger Relay Nissan Pathfinder 2025

Component Function Check

CHECK REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT

Check that an operation noise of rear window defogger relay [located in fuse block (J/B)] can be heard when turning the rear window defogger switch ON.

Is the inspection result normal?

YES>>

Rear window defogger relay power supply circuit is OK.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

Power is supplied to the rear window defogger with BCM control.

CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT

1. Ignition switch ON.

2. Check voltage between BCM harness connector and ground.

   (+)		(–)	Condition		Voltage (Approx.)
   BCM
   Connector	Terminal
   M19	63	Ground	Rear window defogger switch	ON	0 V
   				OFF	Battery voltage

Is the inspection result normal?

YES>>

Rear window defogger power supply circuit is OK.

NO>>

GO TO 2.

CHECK HARNESS CONTINUITY

1. Ignition switch OFF.

2. Disconnect BCM connector and fuse block (J/B) connector.

3. Check continuity between BCM harness connector and fuse block (J/B) harness connector.

   BCM		Fuse block (J/B)		Continuity
   Connector	Terminal	Connector	Terminal
   M19	63	M161	16F	Yes

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace harness.

CHECK REAR WINDOW DEFOGGER RELAY

Check rear window defogger relay.

Refer to Component Inspection.

Is the inspection result normal?

YES>>

Check intermittent incident. Refer to Intermittent Incident.

NO>>

Replace rear window defogger relay.

Component Inspection

CHECK REAR WINDOW DEFOGGER RELAY

Check rear window defogger relay.

Rear window defogger relay		Condition	Continuity
Terminals
3	5	12V direct current supply between terminals 1 and 2.	Yes
		No current supply	No

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace rear window defogger relay.

Rear Window Defogger Power Supply and Ground Circuit Nissan Pathfinder

Component Function Check

CHECK REAR WINDOW DEFOGGER

Check that the heating wire of rear window defogger is heated when turning the rear window defogger switch ON.

Is the inspection result normal?

YES>>

Rear window defogger is OK.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

Heats the heating wire with the power supply from the rear window defogger relay to prevent the rear window from fogging up.

CHECK FUSES

Check if any of the following fuses in fuse block (J/B) are blown:

Location	Fuse No.	Capacity
Fuse block (J/B)	40	10 A
	1	30 A

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Replace the blown fuse after repairing the affected circuit.

CHECK POWER SUPPLY CIRCUIT

1. Ignition switch ON.

2. Check voltage between rear window defogger harness connector and ground.

   (+)		(–)	Condition		Voltage (Approx.)
   Rear window defogger
   Connector	Terminal
   D510	1	Ground	Rear window defogger switch	ON	Battery voltage
   				OFF	0 V

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

GO TO 4.

CHECK GROUND CIRCUIT

1. Ignition switch OFF.

2. Disconnect rear window defogger connector.

3. Check continuity between rear window defogger harness connector and ground.

   Rear window defogger		—	Continuity
   Connector	Terminal
   D550	2	Ground	Yes

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair or replace harness.

CHECK HARNESS CONTINUITY 1

1. Ignition switch OFF.

2. Disconnect rear window defogger condenser connector and rear window defogger connector.

3. Check continuity between rear window defogger condenser harness connector and rear window defogger harness connector.

   Rear window defogger condenser		Rear window defogger		Continuity
   Connector	Terminal	Connector	Terminal
   D509	2	D510	1	Yes

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Replace or repair harness.

CHECK HARNESS CONTINUITY 2

1. Disconnect fuse block (J/B) connector.

2. Check continuity between fuse block (J/B) harness connector and rear window defogger condenser harness connector.

   Fuse block (J/B)		Rear window defogger condenser		Continuity
   Connector	Terminal	Connector	Terminal
   B29	1L	D508	1	Yes

Is the inspection result normal?

YES>>

Replace rear window defogger condenser.

NO>>

Replace or repair harness.

CHECK FILAMENT

Check filament. Refer to Component Inspection.

Is the inspection result normal?

YES>>

Refer to Intermittent Incident.

NO>>

Repair filament. Refer to Inspection and Repair.

Component Inspection

CHECK FILAMENT

Check the filament for damage or open circuits.

Refer to Inspection and Repair.

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Repair filament. Refer to Inspection and Repair.

Door Mirror Defogger Lh Nissan Pathfinder

Component Function Check

CHECK DOOR MIRROR DEFOGGER LH

Check that the heating wire of the door mirror defogger LH is heated when turning the rear window defogger switch ON.

Is the inspection result normal?

YES>>

Door mirror defogger LH is OK.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

To prevent the door mirror from fogging up, it heats the heating wire with the power supply from the rear window defogger relay.

CHECK POWER SUPPLY

Check if the following fuse in the fuse block (J/B) is blown:

Location	Fuse No.	Capacity
Fuse block (J/B)	2	10 A

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Replace the blown fuse after repairing the affected circuit.

CHECK DOOR MIRROR DEFOGGER POWER SUPPLY CIRCUIT

1. Ignition switch OFF.

2. Disconnect door mirror LH connector.

3. Ignition switch ON.

4. Check voltage between door mirror LH harness connector and ground.

(+)		(-)	Condition		Voltage (Approx.)
Door mirror LH
Connector	Terminal
D28	3	Ground	Rear window defogger switch	ON	Battery voltage
				OFF	0 V

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace harness.

CHECK DOOR MIRROR DEFOGGER GROUND CIRCUIT

1. Ignition switch OFF.

2. Check continuity between door mirror LH harness connector and ground.

   Door mirror LH		—	Continuity
   Connector	Terminal
   D28	2	Ground	Yes

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace harness.

CHECK DOOR MIRROR DEFOGGER LH

Check door mirror defogger LH.

Refer to Component Inspection.

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Replace door mirror LH. Refer to Removal and Installation.

CHECK INTERMITTENT INCIDENT

Check intermittent incident.

Refer to Intermittent Incident.

Is the inspection result normal?

YES>>

Check the following:

• Battery power supply circuit

• Fuse block (J/B)

NO>>

Repair or replace the malfunctioning parts.

Component Inspection

CHECK DOOR MIRROR DEFOGGER

1. Ignition switch OFF.

2. Disconnect door mirror LH.

3. Check continuity between door mirror LH terminals.

   Door mirror LH		Continuity
   Terminals
   3	2	Yes

Is the inspection result normal?

YES>>

Check the condition of the harness and the connector.

NO>>

Replace malfunctioning door mirror LH. Refer to Removal and Installation.

Heated Washer Nozzles Nissan Pathfinder 2022

Diagnosis Procedure

CHECK POWER SUPPLY

Check if the following fuse in the fuse block (J/B) is blown:

Location	Fuse No.	Capacity
Fuse block (J/B)	3	10 A

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Replace the blown fuse after repairing the affected circuit.

CHECK HEATED WASHER NOZZLES POWER SUPPLY CIRCUIT

1. Ignition switch OFF.

2. Disconnect heated washer nozzles connector.

3. Ignition switch ON.

4. Check voltage between heated washer nozzles harness connector and ground.

(+)		(-)	Condition		Voltage (Approx.)
Heated washer nozzles
Connector	Terminal
E227	1	Ground	Rear window defogger switch	ON	Battery voltage
				OFF	0 V

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace harness.

CHECK HEATED WASHER NOZZLES GROUND CIRCUIT

1. Ignition switch OFF.

2. Check continuity between heated washer nozzles harness connector and ground.

   Heated washer nozzles		—	Continuity
   Connector	Terminal
   E227	2	Ground	Yes

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace harness.

CHECK HEATED WASHER NOZZLES

Check heated washer nozzles. Refer to Component Inspection.

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Replace heated washer nozzles. Refer to Removal and Installation - Front Washer Nozzle.

CHECK INTERMITTENT INCIDENT

Check intermittent incident.

Refer to Intermittent Incident.

Is the inspection result normal?

YES>>

Check the following:

• Battery power supply circuit

• Fuse block (J/B)

NO>>

Repair or replace the malfunctioning parts.

Component Inspection

CHECK HEATED WASHER NOZZLES

1. Ignition switch OFF.

2. Disconnect heated washer nozzles.

3. Check continuity between heated washer nozzles terminals.

   Heated washer nozzles		Continuity
   Terminals
   1	2	Yes

Is the inspection result normal?

YES>>

Check the condition of the harness and the connector.

NO>>

Replace malfunctioning heated washer nozzles. Refer to Removal and Installation - Front Washer Nozzle.