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 FUSE
- Turn ignition switch OFF.
- Check 30A fuse [No. 59 and 60, located in relay box].NOTE:
Refer to TERMINAL ARRANGEMENT .
Is the inspection result normal?
YES
GO TO STEP 2 .
NO
Replace the blown fuse after repairing the affected circuit.
- CHECK POWER SUPPLY CIRCUIT
- Turn ignition switch ON.
- Check voltage between PTC heater connector and ground.
Terminals Condition of PTC heater Voltage (V)
(Approx.)(+) (-) PTC heater
connectorTerminal M118 1 Ground ON Battery voltage OFF 0 3 ON Battery voltage OFF 0
Is the inspection result normal?
YES
GO TO STEP 3 .
NO
GO TO STEP 4.
- CHECK GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect PTC heater connector.
- Check continuity between PTC heater connector and ground.
PTC heater connector Terminal Ground Continuity M117 2 Yes 4
Is the inspection result normal?
YES
Replace PTC heater. Refer to REMOVAL AND INSTALLATION .
NO
Repair or replace harness.
- CHECK HARNESS CONTINUITY
- Disconnect PTC relay connectors and PTC heater connector.
- Check continuity between PTC heater connector and PTC relay connector.
PTC heater connector Terminal PTC heater relay connector Terminal Continuity M118 1 E11 5 Yes 3 E12 - Check continuity between PTC heater connector and ground.
PTC heater connector Terminal Ground Continuity M118 1 No 3
Is the inspection result normal?
YES
Check intermittent incident. Refer to INTERMITTENT INCIDENT .
NO
Replace or repair harness.