Heater & Air Conditioning Control System (DTC/Circuit Diagnosis)
WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK FRONT AIR MIX DOOR MOTOR (PASSENGER SIDE) COMMUNICATION SIGNAL
- Turn ignition switch ON.
- Check output waveform between front air mix door motor (passenger side) harness connector and ground with the oscilloscope.
+
-
Output waveform
Front air mix door motor (passenger side)
Connector
Terminal
M66
3
Ground
Is the inspection result normal?
YES
GO TO 2.
NO
GO TO 3.
- CHECK INSTALLATION OF FRONT AIR MIX DOOR MOTOR (PASSENGER SIDE)
Check front air mix door motor (passenger side) is properly installed.
Is the inspection result normal?
YES
Replace front air mix door motor (passenger side). Refer to Removal and Installation - Front Air Mix Door Motor (Passenger) .
NO
Repair or replace malfunctioning part.
- CHECK FRONT AIR MIX DOOR MOTOR (PASSENGER SIDE) COMMUNICATION SIGNAL CIRCUIT
- Turn ignition switch OFF.
- Disconnect front air mix door motor (passenger side) and front air control connector.
- Check continuity between front air mix door motor (passenger side) harness connector and front air control harness connector.
Front air mix door motor (passenger side)
Front air control.
Continuity
Connector
Terminal
Connector
Terminal
M66
3
M53
6
Yes
Is the inspection result normal?
YES
Replace front air control. Refer to Removal and Installation - Front Air Control .
NO
Repair harness or connector.