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Home >> Infiniti >> 2012 >> M37 Base >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Seat Belt Control System >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE AND FUSIBLE LINK 

    Check that the following fuse is not blown.

    Terminal No. Signal name Fuse No.
    Driver side 1 Battery power supply 6
    Passenger side

    Is the fuse blown? 

    YES: Replace the blown fuse after repairing the affected circuit if a fuse is blown.

    NO: GO TO 2.

  2. CHECK POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect pre-crash seat belt control unit (driver side and passenger side) connectors.
    3. Check voltage between harness pre-crash seat belt control unit (driver side and passenger side) connector and ground.
      Pre-crash seat belt control unit (driver side and passenger side) Ground Voltage (V) (Approx.)
      Connector Terminal
      B9 1 Battery voltage
      B227

      Is the measurement value normal? 

      YES: GO TO 3.

      NO: Repair or replace harness.

  3. CHECK GROUND CIRCUIT 

    Check continuity between pre-crash seat belt control unit (driver side and passenger side) harness connector and ground.

    Pre-crash seat belt control unit (driver side and passenger side) Ground Continuity
    Connector Terminal
    B9 18 Existed
    20
    B227 18
    20

    Does continuity exist? 

    YES: INSPECTION END

    NO: Repair or replace harness.

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