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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
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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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