Diagnosis Procedure
WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
Power is supplied to the PTC heater with PTC heater control.
- CHECK PTC HEATER RELAY GROUND CIRCUIT
- Turn ignition switch ON.
- Disconnect PTC heater control connector.
- Check voltage between PTC heater control connector and ground.
Terminals
Voltage (V)
(Approx.)
(+)
(-)
PTC heater control
Terminal
M131
14
Ground
Battery voltage
15
16
Is the inspection result normal?
YES
Replace PTC heater control.
NO
GO TO 2 .
- CHECK HARNESS CONTINUITY
- Turn ignition switch OFF.
- Disconnect PTC heater relay connectors.
- Check continuity between PTC heater control connector and PTC heater relay connector.
PTC heater control connector
Terminal
PTC heater relay connector
Terminal
Continuity
M131
14
E144
2
Yes
15
E146
16
E145
- Check continuity between PTC heater control connector and ground.
PTC heater control connector
Terminal
Ground
Continuity
M131
14
No
15
16
Is the inspection result normal?
YES
GO TO 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 appropriate PTC heater relay.