LEMON Manuals: Even more car manuals for everyone
Home >> Infiniti >> 2015 >> Q50 Base, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Audio, Visual & Navigation System (Telematics) (Exc Hybrid) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> TCU >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE

    Check if the fuse is burned out.

    Power source Fuse No.
    Battery #6
    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.

  2. CHECK BATTERY POWER SUPPLY

    Check the voltage between the TCU harness connector and ground.

    TCU Condition Reference value
    (Approx.)
    Connector Terminals
    (+) (-)
    Terminal
    M81 1 2 Ignition switch OFF Battery Voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 3. 

    NO 

    Repair or replace harness between TCU and fuse.

  3. CHECK ACC POWER SUPPLY

    Check the voltage between the TCU harness connector and ground.

    TCU Condition Reference value
    (Approx.)
    Connector Terminals
    (+) (-)
    Terminal
    M81 3 2 Ignition switch ACC Battery Voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 4. 

    NO 

    Repair or replace harness between TCU and fuse.

  4. CHECK GROUND CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect TCU harness connector.
    3. Check the continuity between TCU harness connector and ground.
      TCU Ground Continuity
      Connector Terminal
      M81 2
      7 Exists

    Is the inspection result normal?

    YES 

    INSPECTION END

    NO 

    Repair or replace malfunctioning parts.

scientia non olet · About LEMON Manuals