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Home >> Infiniti >> 2011 >> QX56 AWD >> 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 GROUND CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect pre-crash seat belt control unit (driver side and passenger side) harness connector.
    3. Check continuity between pre-crash seat belt control unit (driver side and passenger side) harness connector and ground.
      CONTINUITY SPECIFICATION

      Pre-crash seat belt control unit Ground Continuity
      Connector Terminal
      B9 (Driver side) 18 Existed
      20
      B231 (Passenger side) 18
      20

      Is the measurement value normal? 

      YES: GO TO 2.

      NO: Repair or replace harness or connector.

  2. CHECK POWER SUPPLY CIRCUIT-I

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

    VOLTAGE SPECIFICATION

    Pre-crash seat belt control unit Ground Voltage (Approx.)
    Connector Terminal
    B9 (Driver side) 1 Battery voltage
    B231 (Passenger side)

    Is the measurement value normal? 

    YES: INSPECTION END

    NO: GO TO 3.

  3. CHECKPOWER SUPPLY CIRCUIT-II
    1. Disconnect fuse block (J/B) harness connector.
    2. Check continuity between pre-crash seat belt control unit (driver side and passenger side) harness connector and fuse block (J/B) harness connector.
      CONTINUITY SPECIFICATION

      Pre-crash seat belt control unit Fuse block (J/B) Continuity
      Connector Terminal Connector Terminal
      B9 (Driver side) 1 M2 6B Existed
      B231 (Passenger side)
    3. Check continuity between pre-crash seat belt control unit (driver side and passenger side) harness connector and ground.
      CONTINUITY SPECIFICATION

      Pre-crash seat belt control unit Ground Continuity
      Connector Terminal
      B9 (Driver side) 1 Not existed
      B231 (Passenger side)

      Is the measurement value normal? 

      YES: Check 10 A fuse (No. 6).

      NO: Repair or replace harness or connector.

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