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Home >> Infiniti >> 2012 >> M37 x >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Security Control System (With Intelligent Key System) >> DTC/Circuit Diagnosis >> DTC B26F5: Steering Lock Status Switch >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK IPDM E/R INPUT SIGNAL 
    1. Turn ignition switch OFF.
    2. Check voltage between IPDM E/R harness connector and ground.
      (+) (-) Condition Voltage (V) (Approx.)
      IPDM E/R
      Connector Terminal
      E17 32 Ground Steering lock unit Lock 0
      Unlock 12
      34 Lock 12
      Unlock 0
      NOTE:
      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.
      IPDM E/R Steering lock unit Continuity
      Connector Terminal Connector Terminal
      E17 32 M40 3 Existed
      34 8
    3. Check continuity between IPDM E/R harness connector and ground.
      IPDM E/R Ground Continuity
      Connector Terminal
      E17 32 Not existed
      34

      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 CONSULT display instruction.

      : INSPECTION END

  4. CHECK BCM INPUT SIGNAL 
    1. Turn ignition switch OFF.
    2. Check voltage between BCM harness connector and ground.
      (+) (-) Condition Voltage (V) (Approx.)
      BCM
      Connector Terminal
      M123 107 Ground Steering lock unit Lock 0
      Unlock 12
      108 Lock 12
      Unlock 0
      NOTE:
      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  7.

      NO: GO TO 5.

  5. 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.
      BCM Steering lock unit Continuity
      Connector Terminal Connector Terminal
      M123 107 M40 3 Existed
      108 8
    3. Check continuity between BCM harness connector and ground.
      BCM Ground Continuity
      Connector Terminal
      M123 107 Not existed
      108

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Repair or replace harness.

  6. REPLACE STEERING LOCK UNIT 
    1. Replace steering lock unit.
    2. Perform the service procedure for steering lock unit replacement. Refer to CONSULT display instruction.

      : INSPECTION END

  7. REPLACE BCM 
    1. Replace BCM. Refer to "REMOVAL AND INSTALLATION ".
    2. Perform DTC CONFIRMATION PROCEDURE for DTC B26F5. Refer to "DTC LOGIC ".

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION ".

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