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 REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT
- Turn ignition switch ON.
- Check voltage between BCM connector and ground.
(+)
(-)
Condition
Voltage (V)
(Approx.)
BCM
Connector
Terminal
M19
61
Ground
Rear window defogger switch
ON
0
OFF
Battery voltage
Is the inspection result normal?
YES
Rear window defogger power supply circuit is OK.
NO
GO TO 2.
- CHECK HARNESS CONTINUITY
- Turn ignition switch OFF.
- Disconnect BCM and fuse block (J/B).
- Check continuity between BCM connector and fuse block (J/B) connector.
BCM
Fuse block (J/B)
Continuity
Connector
Terminal
Connector
Terminal
M19
61
M4
6P
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.