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Home >> Infiniti >> 2011 >> G37 IPL, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Exterior Lighting System -- G37 Coupe >> DTC/Circuit Diagnosis >> Turn Signal Lamp Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK TURN SIGNAL LAMP BULB

    Check the applicable lamp bulb.

    Is the bulb normal? 

    YES: GO TO 2.

    NO: Replace the bulb.

  2. CHECK TURN SIGNAL LAMP OUTPUT VOLTAGE

    CONSULT-III ACTIVE TEST

    1. Turn the ignition switch OFF.
    2. Disconnect the front combination lamp connector or the rear combination lamp connector.
    3. Turn the ignition switch ON.
    4. Select "FLASHER" of BCM (FLASHER) active test item.
    5. With operating the turn signal switch, check the voltage between the BCM harness connector and the ground.

      Front

      VOLTAGE REFERENCE CHART

      Terminals Test item Voltage (Approx.)
      (+) (-)
      BCM Ground FLASHER
      Connector Terminal
      RH M119 17 RH
      G05372447
      Off 0 V
      LH 18 LH
      G05372447
      Off 0 V

      Rear

      VOLTAGE REFERENCE CHART

      Terminals Test item Voltage (Approx.)
      (+) (-)
      BCM Ground FLASHER
      Connector Terminal
      RH M120 20 RH
      G05372447
      Off 0 V
      LH 25 LH
      G05372447
      Off 0 V

      Is the measurement value normal? 

      YES: GO TO 3.

      NO: Replace BCM.

  3. CHECK TURN SIGNAL LAMP OPEN CIRCUIT
    1. Turn the ignition switch OFF.
    2. Disconnect BCM connector.
    3. Check the continuity between the BCM harness connector and the front combination lamp or the rear combination lamp harness connector.

      Front combination lamp

      CONTINUITY REFERENCE CHART

      BCM Front combination lamp Continuity
      Connector Terminal Connector Terminal
      RH M119 17 E28 6 Existed
      LH 18 E58 6

      Rear combination lamp

      CONTINUITY REFERENCE CHART

      BCM Rear combination lamp Continuity
      Connector Terminal Connector Terminal
      RH M120 20 B67 4 Existed
      LH 25 B60 4

      Does continuity exist? 

      YES: GO TO 4.

      NO: Repair the harnesses or connectors.

  4. CHECK TURN SIGNAL LAMP SHORT CIRCUIT

    Check continuity between the BCM harness connector and the ground.

    Front

    CONTINUITY REFERENCE CHART

    BCM Ground Continuity
    Connector Terminal
    RH M119 17 Not existed
    LH 18

    Rear

    CONTINUITY REFERENCE CHART

    BCM Ground Continuity
    Connector Terminal
    RH M120 20 Not existed
    LH 25

    Does continuity exist? 

    YES: Repair the harnesses or connectors.

    NO: GO TO 5.

  5. CHECK TURN SIGNAL LAMP GROUND OPEN CIRCUIT

    Check the voltage between the BCM harness connector and the front combination lamp or the rear combination lamp and the ground.

    Front combination lamp

    CONTINUITY REFERENCE CHART

    Front combination lamp Ground Continuity
    Connector Terminal
    RH E28 4 Existed
    LH E58 4

    Rear combination lamp

    CONTINUITY REFERENCE CHART

    Rear combination lamp Ground Continuity
    Connector Terminal
    RH B67 3 Existed
    LH B60 3

    Does continuity exist? 

    YES: Replace the front combination lamp or the rear combination lamp.

    NO: Repair the harnesses or connectors.

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