Diagnosis Procedure
WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK FUSE
Check if the fuse is burned out.
Power source Fuse No. Battery #7 Ignition switch ACC or ON #1 Is the inspection result normal?
YES
GO TO STEP 2.
NO
Replace the fuse after repairing the applicable circuit.
- CHECK BATTERY POWER SUPPLY
Check the voltage between the TCU harness connector and ground.
(+) (-) Condition Reference value
(Approx.)TCU Connector Terminal M159 1 Ground Ignition switch OFF Battery Voltage Is the inspection result normal?
YES
GO TO STEP 3.
NO
Repair or replace harness between TCU and fuse.
- CHECK ACC POWER SUPPLY
Check the voltage between the TCU harness connector and ground.
(+) (-) Condition Reference value
(Approx.)TCU Connector Terminal M159 2 Ground Ignition switch ACC 12.0 V Is the inspection result normal?
YES
GO TO STEP 4.
NO
Repair or replace harness between TCU and fuse.
- CHECK GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect TCU harness connector.
- Check the continuity between TCU harness connector and ground.
TCU Ground Continuity Connector Terminal M159 28 29 Existed
Is the inspection result normal?
YES
INSPECTION END
NO
Repair or replace TCU ground circuit.