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Home >> Infiniti >> 2011 >> FX35 RWD >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Exterior Lighting System -- FX35/FX50 >> DTC/Circuit Diagnosis >> DTC B2514: Height Sensor Unusual [RR] >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK HEIGHT SENSOR POWER SUPPLY OUTPUT
    1. Turn the ignition switch ON.
    2. Check the voltage between the AFS control unit harness connector and the ground.
      VOLTAGE REFERENCE CHART

      Terminals Voltage (Approx.)
      (+) (-)
      AFS control unit Ground
      Connector Terminal
      M16 6 5 V

      Is the measurement value within the standard value? 

      YES: GO TO 2.

      NO: Replace AFS control unit.

  2. CHECK HEIGHT SENSOR POWER SUPPLY INPUT

    Check the voltage between the AFS control unit harness connector and the ground.

    VOLTAGE REFERENCE CHART

    Terminals Voltage (Approx.)
    (+) (-)
    AFS control unit Ground
    Connector Terminal
    M16 28 0.25 - 4.75 V

    Is the measurement value within the standard value? 

    YES: Replace AFS control unit.

    Less than the standard value: GO TO 3.

    Higher than the standard value: GO TO  6.

  3. CHECK HEIGHT SENSOR POWER SUPPLY CIRCUIT OUTPUT VOLTAGE
    1. Turn the ignition switch OFF.
    2. Disconnect the height sensor connector.
    3. Turn the ignition switch ON.
    4. Check the voltage between the height sensor harness connector and the ground.
      VOLTAGE REFERENCE CHART

      Terminals Voltage (Approx.)
      (+) (-)
      Height sensor Ground
      Connector Terminal
      B32 1 5 V

      Is the measurement value within the standard value? 

      YES: GO TO 4.

      NO: Repair the harnesses or connectors.

  4. CHECK HEIGHT SENSOR SIGNAL OPEN CIRCUIT
    1. Turn the ignition switch OFF.
    2. Disconnect AFS control unit connector.
    3. Check continuity between the AFS control unit harness connector and the height sensor harness connector.
      CONTINUITY REFERENCE CHART

      AFS control unit Height sensor Continuity
      Connector Terminal Connector Terminal
      M16 28 B32 2 Existed

      Does continuity exist? 

      YES: GO TO 5.

      NO: Repair the harnesses or connectors.

  5. CHECK HEIGHT SENSOR SIGNAL SHORT CIRCUIT

    Check continuity between the height sensor harness connector and the ground.

    CONTINUITY REFERENCE CHART

    Height sensor Ground Continuity
    Connector Terminal
    B32 2 Not existed

    Does continuity exist? 

    YES: Repair the harnesses or connectors.

    NO: Replace the height sensor.

  6. CHECK HEIGHT SENSOR GROUND

    Check the voltage between the AFS control unit harness connector and the ground.

    VOLTAGE REFERENCE CHART

    Terminals Voltage (Approx.)
    (+) (-)
    AFS control unit Ground
    Connector Terminal
    M16 8 0 V

    Is the measurement value within the standard value? 

    YES: GO TO 7.

    NO: Replace AFS control unit.

  7. CHECK HEIGHT SENSOR GROUND CIRCUIT
    1. Turn the ignition switch OFF.
    2. Disconnect AFS control unit connector and the height sensor connector.
    3. Check continuity between the AFS control unit harness connector and the height sensor harness connector.
      CONTINUITY REFERENCE CHART

      AFS control unit Height sensor Continuity
      Connector Terminal Connector Terminal
      M16 8 B32 3 Existed

      Does continuity exist? 

      YES: Replace the height sensor.

      NO: Repair the harnesses or connectors.

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