Diagnosis Procedure
WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK SOS SWITCH LED SIGNAL
- Turn ignition switch ON.
- Check the voltage between TCU harness connector and ground.
TCU
Ground
Voltage
(Approx.)
Connector
Terminal
M173
5
(-)
Battery Voltage
Is the inspection result normal?
YES
GO TO 2 .
NO
Replace TCU. Refer to Removal and Installation .
- CHECK SOS SWITCH LED SIGNAL CIRCUIT FOR OPEN
- Turn ignition switch OFF.
- Disconnect TCU connector M173 and telematics switch connector.
- Check the continuity between TCU connector M173 and telematics switch connector R21.
TCU
Telematics switch
Continuity
Connector
Terminal
Connector
Terminal
M173
5
R21
1
Yes
Is the inspection result normal?
YES
GO TO 3 .
NO
Repair or replace harness or connectors.
- CHECK SOS SWITCH LED SIGNAL CIRCUIT FOR SHORT
Check the continuity between TCU connector M173 and ground.
TCU
Ground
Continuity
Connector
Terminal
M173
5
-
No
Is the inspection result normal?
YES
Replace telematics switch. Refer to Removal and Installation .
NO
Repair or replace harness or connectors.