Diagnosis Procedure
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 EACH DOOR MOTOR POWER SUPPLY
- Turn ignition switch ON.
- Check voltage between intake door motor harness connector and ground.
+
-
Voltage
(Approx.)
Intake door motor
Connector
Terminal
M128
1
Ground
Battery voltage
Is the inspection result normal?
YES
GO TO 2.
NO
GO TO 3.
- CHECK EACH DOOR MOTOR GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect intake door motor connector.
- Check continuity between intake door motor harness connector and ground.
Intake door motor
--
Continuity
Connector
Terminal
M128
3
Ground
Yes
Is the inspection result normal?
YES
Inspection End.
NO
Repair harness or connector.
- CHECK EACH DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN
- Disconnect A/C auto amp. connector.
- Check continuity between intake door motor harness connector and A/C auto amp. harness connector.
Intake door motor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M128
1
M50
17
Yes
Is the inspection result normal?
YES
GO TO 4.
NO
Repair harness or connector.
- CHECK EACH DOOR MOTOR POWER SUPPLY CIRCUIT FOR SHORT
- Disconnect following connectors.
- Air mix door motor (driver side)
- Air mix door motor (passenger side)
- Mode door motor (front)
- Air mix door motor (rear)
- Mode door motor (rear)
- Check continuity between intake door motor harness connector and ground.
Intake door motor
--
Continuity
Connector
Terminal
M128
1
Ground
No
Is the inspection result normal?
YES
Replace A/C auto amp. Refer to Removal and Installation .
NO
Repair harness or connector.
- Disconnect following connectors.