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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK LEVEL HARNESS AND CONTROL ECU) CONNECTOR (FRONT CONTROLLER - HEADLIGHT BEAM 
    1. Disconnect connector 1H from the front controller.
    2. Disconnect the headlight beam level control ECU connector.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying Headlight Beam Level Control ECU Connector Terminals
      G05409987Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: Identifying Front Controller Connector Terminals
      G05409988Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A21-7 - 1H-11 Always Below 1 Ω
      A21-7 - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - HEADLIGHT BEAM LEVEL CONTROL ECU) 
    1. Disconnect the headlight beam level control ECU connector and the skid control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance: 

      without VSC 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A21-6 - A40-13 Always Below 1 Ω
      A21-5 - A40-24 Always Below 1 Ω
      A21-6 - Body ground Always 10 kΩ or higher
      A21-5 - Body ground Always 10 kΩ or higher

      with VSC 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A21-6 - A34-39 Always Below 1 Ω
      A21-5 - A34-40 Always Below 1 Ω
      A21-6 - Body ground Always 10 kΩ or higher
      A21-5 - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 3: Disconnecting Headlight Beam Level Control ECU Connector
    G05409989Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  3. CHECK HARNESS LEVEL CONTROL AND ECU) CONNECTOR (GENERATOR ASSEMBLY - HEADLIGHT BEAM 
    1. Disconnect connector B6 of the generator and connector A21 of the headlight beam level control ECU.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      B6-4 (L) - A21-8 (CHG-) Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 4: Disconnecting Headlight Beam Level Control ECU Connector
    G05409990Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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