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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
  1. PERFORM ACTIVE TEST BY TECHSTREAM (HEADLIGHT) 
    1. Operate the Techstream according to the steps on the display and select "Active Test".
      1. Techstream

        Main Body 

        MAIN BODY - TECHSTREAM ACTIVE TEST CHART

        Tester Display Test Part Control Range Diagnostic Note
        Head Light (Hi) Headlight (High) ON or OFF -

        OK: Headlight (High) turns on / off. 

    NG: Go to step 2 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

  2. INSPECT FUSE (HEAD LH, HEAD RH) 
    1. Remove the HEAD LH and HEAD RH fuse from the engine room junction block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      FUSE (HEAD LH, HEAD RH)

      Tester Connection Condition Specified Condition
      HEAD LH fuse Always Below 1 Ω
      HEAD RH fuse

    NG: REPLACE FUSE 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT HIGH BULB - BATTERY) 
    1. for LH:
      1. Disconnect the A8 headlight connector.
        Fig 1: Identifying Headlight Connector Terminals - LH
        G05160749Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the voltage according to the value(s) in the table below.

        Standard voltage 

        HEADLIGHT HIGH BULB - BATTERY LH

        Tester Connection Switch Condition Specified Condition
        A8-2 - Body ground Light control switch HEAD, dimmer switch High 11 to 14 V
        Light control switch HEAD, dimmer switch except High Below 1 V
    2. for RH:
      1. Disconnect the A9 headlight connector.
        Fig 2: Identifying Headlight Connector Terminals - RH
        G05160750Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the voltage according to the value(s) in the table below.

        Standard voltage 

        HEADLIGHT HIGH BULB - BATTERY RH

        Tester Connection Switch Condition Specified Condition
        A9-2 - Body ground Light control switch HEAD, dimmer switch High 11 to 14 V
        Light control switch HEAD, dimmer switch except High Below 1 V

    NG: Go to step 4 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT HIGH BULB - BODY GROUND) 

  4. INSPECT HEADLIGHT DIMMER RELAY (DIM) 
    1. Remove the headlight dimmer relay from the engine room relay block.
      Fig 3: Identifying Headlight Dimmer Relay (DIM) Terminals
      G05160751Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      HEADLIGHT DIMMER RELAY (DIM)

      Tester Connection Condition Specified Condition
      3 - 5 When battery voltage is not applied to terminals land 2 10 kΩ or higher
      When battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG: REPLACE HEADLIGHT DIMMER RELAY 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - BATTERY) 
    1. Remove the headlight dimmer relay from the engine room relay block.
      Fig 4: Identifying Headlight Dimmer Relay (DIM) Terminals
      G05160752Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      HEADLIGHT DIMMER RELAY - BATTERY

      Tester Connection Switch Condition Specified Condition
      Headlight dimmer relay terminal 1 - Body ground Light control switch HEAD, dimmer switch Low 11 to 14 V
      Headlight dimmer relay terminal 3 - Body ground Light control switch HEAD, dimmer switch Low

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - HEADLIGHT HIGH BULB) 
    Fig 5: Identifying Headlight Dimmer Relay And Headlight High Bulb Connector Terminals
    G05160753Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the headlight dimmer relay from the engine room relay block.
    2. for LH:
      1. Disconnect the A8 headlight connector.
      2. Measure the resistance according to the value(s) in the table below.

        Standard resistance 

        HEADLIGHT DIMMER RELAY - HEADLIGHT HIGH BULB LH

        Tester Connection Condition Specified Condition
        Headlight dimmer relay terminal 5 - A8-2 Always Below 1 Ω
        Headlight dimmer relay terminal 5 - Body ground Always 10 kΩ or higher
    3. for RH:
      1. Disconnect the A9 headlight connector.
      2. Measure the resistance according to the value(s) in the table below.

        Standard resistance 

        HEADLIGHT DIMMER RELAY - HEADLIGHT HIGH BULB RH

        Tester Connection Condition Specified Condition
        Headlight dimmer relay terminal 5 - A9-2 Always Below 1 Ω
        Headlight dimmer relay terminal 5 - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. CHECK HEADLIGHT (HIGH BEAM) 
    1. Disconnect the DB ECU connector.
      Fig 6: Identifying Main Body ECU Connector Terminals
      G05160754Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using a service wire, connect DB-19 (DIM) on the wire harness side and body ground.
    3. Check that the headlight high beam illuminates.

      OK: Headlight high beam illuminates. 

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT DIMMER RELAY - MAIN BODY ECU) 

    OK: REPLACE MAIN BODY ECU 

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