Defogger (Circuit Diagnosis)

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

CHECK POWER SUPPLY

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

COMPONENT PARTS	AMPERE	FUSE NO.
Fuse block (J/B)	10 A	22

Is the inspection result normal?

YES

GO TO 2.

If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

CHECK DOOR MIRROR DEFOGGER POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect door mirror LH.
Turn ignition switch ON.
Check voltage between door mirror LH connector D4 terminal 1 and ground.

(+)		(-)	Condition		Voltage (V) (Approx.)
Door mirror LH
Connector	Terminal
D4	1	Ground	Rear window defogger switch	ON	Battery voltage
				OFF	0

Is the inspection result normal?

YES

GO TO 3.

Repair or replace harness.

CHECK DOOR MIRROR DEFOGGER GROUND CIRCUIT

Turn ignition switch OFF.

Check continuity between door mirror LH connector and ground.

Door mirror LH		Ground	Continuity
Connector	Terminal
D4	2		Yes

Is the inspection result normal?

YES

GO TO 4.

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.