LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2012 >> G37 Base, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 234 (Security Control System -- G37 Convertible) >> DTC/Circuit Diagnosis >> DTC B210A: Steering Lock Unit >> Diagnosis Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Infiniti G37. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECTION START

    Perform inspection in accordance with procedure that confirms DTC.

    Which procedure confirms DTC? 

    DTC confirmation procedure 1: Go to 2.

    DTC confirmation procedure 2: Go to 6.

  2. CHECK BCM OUTPUT SIGNAL-1
    1. Turn ignition switch OFF.
    2. Disconnect steering lock unit connector and IPDM E/R connector.
    3. Check voltage between steering lock unit harness connector and ground.
    TERMINALS VOLTAGE REFERENCE CHART

    (+) (-) Voltage (V) (Approx.)
    Steering lock unit
    Connector Terminal
    M40 3 Ground Battery voltage

    Is the inspection result normal? 

    YES: Go to 4.

    NO: Go to 3.

  3. CHECK STEERING LOCK UNIT CIRCUIT-1
    1. Disconnect BCM connector.
    2. Check continuity between steering lock unit harness connector and BCM harness connector.
      TERMINALS CONTINUITY REFERENCE CHART

      Steering lock unit BCM Continuity
      Connector Terminal Connector Terminal
      M40 3 M122 97 Existed
    3. Check continuity between steering lock unit harness connector and ground.
    TERMINALS CONTINUITY REFERENCE CHART

    Steering lock unit Ground Continuity
    Connector Terminal
    M40 3 Not existed

    Is the inspection result normal? 

    YES: Replace BCM. Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair or replace harness.

  4. CHECK IPDM E/R OUTPUT SIGNAL-1
    1. Connect IPDM E/R connector.
    2. Disconnect BCM connector.
    3. Check voltage between steering lock unit harness connector and ground.
    TERMINALS VOLTAGE REFERENCE CHART

    (+) (-) Voltage (V) (Approx.)
    Steering lock unit
    Connector Terminal
    M40 3 Ground Battery voltage

    Is the inspection result normal? 

    YES: Replace steering lock unit.

    NO: Go to 5.

  5. CHECK STEERING LOCK UNIT CIRCUIT-2
    1. Disconnect IPDM E/R connector.
    2. Check continuity between steering lock unit harness connector and IPDM E/R harness connector.
      TERMINALS CONTINUITY REFERENCE CHART

      Steering lock unit IPDM E/R Continuity
      Connector Terminal Connector Terminal
      M40 3 E5 32 Existed
    3. Check continuity between steering lock unit harness connector and ground.
    TERMINALS CONTINUITY REFERENCE CHART

    Steering lock unit Ground Continuity
    Connector Terminal
    M40 3 Not existed

    Is the inspection result normal? 

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

    NO: Repair or replace harness.

  6. CHECK BCM OUTPUT SIGNAL-2
    1. Turn ignition switch OFF.
    2. Disconnect steering lock unit connector and IPDM E/R connector.
    3. Check voltage between steering lock unit harness connector and ground.
    TERMINALS VOLTAGE REFERENCE CHART

    (+) (-) Voltage (V) (Approx.)
    Steering lock unit
    Connector Terminal
    M40 8 Ground Battery voltage

    Is the inspection result normal? 

    YES: Go to 8.

    NO: Go to 7.

  7. CHECK STEERING LOCK UNIT CIRCUIT-3
    1. Disconnect BCM connector.
    2. Check continuity between steering lock unit harness connector and BCM harness connector.
      TERMINALS CONTINUITY REFERENCE CHART

      Steering lock unit BCM Continuity
      Connector Terminal Connector Terminal
      M40 8 M122 98 Existed
    3. Check continuity between steering lock unit harness connector and ground.
    TERMINALS CONTINUITY REFERENCE CHART

    Steering lock unit Ground Continuity
    Connector Terminal
    M40 8 Not existed

    Is the inspection result normal? 

    YES: Replace BCM. Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair or replace harness.

  8. CHECK IPDM E/R OUTPUT SIGNAL-2
    1. Connect IPDM E/R connector.
    2. Disconnect BCM connector.
    3. Check voltage between steering lock unit harness connector and ground.
    TERMINALS VOLTAGE REFERENCE CHART

    (+) (-) Voltage (V) (Approx.)
    Steering lock unit
    Connector Terminal
    M40 8 Ground Battery voltage

    Is the inspection result normal? 

    YES: Replace steering lock unit.

    NO: Go to 9.

  9. CHECK STEERING LOCK UNIT CIRCUIT-4
    1. Disconnect IPDM E/R connector.
    2. Check continuity between steering lock unit harness connector and IPDM E/R harness connector.
    TERMINALS CONTINUITY REFERENCE CHART

    Steering lock unit IPDM E/R Continuity
    Connector Terminal Connector Terminal
    M40 8 E5 33 Existed
  10. Check continuity between steering lock unit harness connector and ground.
TERMINALS CONTINUITY REFERENCE CHART

Steering lock unit Ground Continuity
Connector Terminal
M40 8 Not existed

Is the inspection result normal? 

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

NO: Repair or replace harness.

scientia non olet · About LEMON Manuals