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Home >> Infiniti >> 2011 >> M56 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Security Control System) >> DTC/Circuit Diagnosis >> DTC B26F5: Steering Lock Status Switch >> Diagnosis Procedure
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Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK IPDM E/R INPUT SIGNAL
    1. Turn ignition switch OFF.
    2. Check voltage between IPDM E/R harness connector and ground.
      VOLTAGE SPECIFICATION

      (+) (-) Condition Voltage (V) (Approx.)
      IPDM E/R
      Connector Terminal
      E17 63 Ground Steering lock unit Lock 12
      Unlock 0
      65 Lock 0
      Unlock 12
      NOTE:
      SELECTOR LEVER POSITION

      To lock the steering
      1. Set the selector lever in the P position.
      2. Turn the power supply position to the OFF position.
      3. Press any door switch.
      To unlock the steering
      1. Set the selector lever in the P position.
      2. Press the push-button ignition switch with brake pedal not depressed.

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 2.

  2. CHECK IPDM E/R INPUT SIGNAL CIRCUIT
    1. Disconnect IPDM E/R connector and steering lock unit connector.
    2. Check continuity between IPDM E/R harness connector and steering lock unit harness connector.
      CONTINUITY SPECIFICATION

      IPDM E/R Steering lock unit Continuity
      Connector Terminal Connector Terminal
      E17 63 M12 8 Existed
      65 3
    3. Check continuity between IPDM E/R harness connector and ground.
      CONTINUITY SPECIFICATION

      IPDM E/R Ground Continuity
      Connector Terminal
      E17 63 Not existed
      65

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace harness.

  3. REPLACE STEERING LOCK UNIT
    1. Replace steering lock unit.
    2. Perform the service procedure for steering lock unit replacement. Refer to the CONSULT-III Operation Instructions NATS-IVIS/NVIS.

      INSPECTION END

  4. CHECK BCM INPUT SIGNAL
    1. Turn ignition switch OFF.
    2. Check voltage between BCM harness connector and ground.
      VOLTAGE SPECIFICATION

      (+) (-) Condition Voltage (V) (Approx.)
      BCM
      Connector Terminal
      M71 107 Ground Steering lock unit Lock 0
      Unlock 12
      108 Lock 12
      Unlock 0
      NOTE:
      SELECTOR LEVER POSITION

      To lock the steering
      1. Set the selector lever in the P position.
      2. Turn the power supply position to the OFF position.
      3. Press any door switch.
      To unlock the steering
      1. Set the selector lever in the P position.
      2. Press the push-button ignition switch with brake pedal not depressed.

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: GO TO  6.

  5. REPLACE BCM
    1. Replace BCM. Refer to "REMOVAL AND INSTALLATION ".
    2. Perform initialization of BCM and registration of all Intelligent Keys using CONSULT-III.

      For initialization and registration procedures, refer to the CONSULT-III Operation Instructions NATS-IVIS/NVIS.

      INSPECTION END

  6. CHECK BCM INPUT SIGNAL CIRCUIT
    1. Disconnect BCM connector and steering lock unit connector.
    2. Check continuity between BCM harness connector and steering lock unit harness connector.
      CONTINUITY SPECIFICATION

      BCM Steering lock unit Continuity
      Connector Terminal Connector Terminal
      M71 107 M12 3 Existed
      108 8
    3. Check continuity between BCM harness connector and ground.
      CONTINUITY SPECIFICATION

      BCM Ground Continuity
      Connector Terminal
      M71 107 Not existed
      108

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: Repair or replace harness.

  7. REPLACE STEERING LOCK UNIT
    1. Replace steering lock unit.
    2. Perform the service procedure for steering lock unit replacement. Refer to the CONSULT-III Operation Instructions NATS-IVIS/NVIS.

      INSPECTION END

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