LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2012 >> M37 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Security Control System (With Intelligent Key System) >> DTC/Circuit Diagnosis >> DTC B26EF: Steering Lock Relay >> Diagnosis Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnosis Procedure

  1. CHECK DTC OF IPDM E/R 

    Check DTC in "Self Diagnostic Result" mode of IPDM E/R using CONSULT.

    Is DTC detected? 

    YES: Perform the diagnosis procedure related to the detected DTC. Refer to "DTC INDEX ".

    NO: GO TO 2.

  2. CHECK STEERING LOCK UNIT POWER SUPPLY 

    Check voltage between steering lock unit harness connector and ground.

    (+) (-) Condition Voltage (V) (Approx.)
    Steering lock unit
    Connector Terminal
    M40 1 Ground Ignition switch OFF A few seconds after opening the driver door Battery voltage
    Ignition switch LOCK Press the push-button ignition switch Battery voltage
    Ignition switch ACC or ON 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 normal? 

    YES: GO TO 3.

    NO: GO TO  4.

  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 STEERING LOCK RELAY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R connector.
    3. Disconnect steering lock unit connector.
    4. 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
      E7 49 M40 1 Existed
    5. Check continuity between IPDM E/R harness connector and ground.
      IPDM E/R Ground Continuity
      Connector Terminal
      E7 49 Not existed

      Is the inspection result normal? 

      YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION ".

      NO: Repair or replace harness.