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Home >> Infiniti >> 2019 >> QX30 Pure >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Telematics System (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE 
    1. Turn ignition switch OFF.
    2. Check if the fuse is burned out.

      Fuse No.

      Capacity

      #55

      15 A

      #93

      5 A

    Is the fuse blown?

    YES

    Replace the fuse after repairing the applicable circuit.

    NO

    GO TO 2.

  2. CHECK BATTERY POWER SUPPLY 

    Check the voltage between the TCU harness connector and ground.

    (+)

    (-)

    Standard value

    Reference value

    (Approx.)

    TCU

    Connector

    Terminal

    M215

    1

    Ground

    9.0 - 16.0 V

    Battery Voltage

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair or replace harness between TCU and fuse.

  3. CHECK ACC POWER SUPPLY 
    1. Turn ignition switch ON.
    2. Check the voltage between the TCU harness connector and ground.

    (+)

    (-)

    Standard value

    Reference value

    (Approx.)

    TCU

    Connector

    Terminal

    M215

    2

    Ground

    9.0 - 16.0 V

    Battery Voltage

    Is the inspection result normal?

    YES

    GO TO 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

      Existed

      M215

      28

      29

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Repair TCU ground circuit.

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