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 MULTIFUNCTION SWITCH (REAR WINDOW DEFOGGER SWITCH) CIRCUIT
Operate the rear window defogger switch.
Is the inspection result normal?
YES
Inspection End.
NO
GO TO 2.
- CHECK MULTIFUNCTION SWITCH (REAR WINDOW DEFOGGER SWITCH) CIRCUIT VOLTAGE
- Turn ignition switch ACC.
- Check voltage between multifunction switch harness connector M98 terminal 3 and ground.
(+)
(-)
Condition
Voltage (V)
(Approx.)
Multifunction switch
Connector
Terminal
M98
3
Ground
Ignition switch
ACC
Battery voltage
OFF
0
Is the inspection result normal?
YES
Replace multifunction switch. Refer to Removal and Installation .
NO
GO TO 3.
- CHECK MULTIFUNCTION SWITCH (REAR WINDOW DEFOGGER SWITCH) CIRCUIT FOR OPEN
- Turn ignition switch OFF.
- Disconnect accessory relay-2 connector E22.
- Disconnect multifunction switch connector M98.
- Check continuity between multifunction switch connector M98 terminal 3 and accessory relay-2 connector E22 terminal 5.
Multifunction switch
Accessory relay-2
Continuity
Connector
Terminal
Connector
Terminal
M98
3
E22
5
Yes
Is the inspection result normal?
YES
GO TO 4.
NO
Repair and replace harness.
- CHECK MULTIFUNCTION SWITCH (REAR WINDOW DEFOGGER SWITCH) CIRCUIT FOR SHORT
- Turn ignition switch OFF.
- Disconnect accessory relay-2 connector E22.
- Disconnect multifunction switch connector M98.
- Check continuity between multifunction switch connector M98 terminal 3 and ground.
Multifunction switch
Ground
Continuity
Connector
Terminal
M98
3
No
Is the inspection result normal?
YES
Check the following:
- Accessory relay-2.
- Battery power supply circuit.
NO
Repair or replace harness.