Diagnosis Procedure
WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
Regarding Wiring Diagram information, refer to WIRING DIAGRAM .
- CHECK PTC HEATER RELAY GROUND CIRCUIT
- Turn ignition switch ON.
- Check voltage between A/C auto amp. connector and ground.
Terminals Voltage (V)
(Approx.)(+) (-) A/C auto amp. Terminal M50 19 Ground Battery voltage 39
Is the inspection result normal?
YES
Replace A/C auto amp. Refer to REMOVAL AND INSTALLATION .
NO
GO TO STEP 2 .
- CHECK HARNESS CONTINUITY
- Turn ignition switch OFF.
- Disconnect A/C auto amp. and PTC heater relay connector.
- Check continuity between A/C auto amp. connector and PTC heater relay connector.
A/C auto amp. connector Terminal PTC heater relay connector Terminal Continuity M50 19 E11 2 Yes 39 E12 - Check continuity between A/C auto amp. connector and ground.
A/C auto amp. connector Terminal Ground Continuity M50 19 No 39
Is the inspection result normal?
YES
GO TO STEP 3 .
NO
Repair or replace harness.
- CHECK PTC HEATER RELAY
Check PTC heater relay. Refer to COMPONENT INSPECTION .
Is the inspection result normal?
YES
Check intermittent incident. Refer to INTERMITTENT INCIDENT .
NO
Replace PTC heater relay.