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Headlight Solenoid Circuit [08/2015 - ]: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Active Test.
    5. Check the operation.
      MAIN BODY

      Tester Display Test Part Control Range Diagnostic Note
      Head Light Hi Dimmer relay (High beam headlights) ON/OFF -

      OK

      The high beam headlights illuminate.

    NG → Refer to   2 

    OK → Refer to   7 

  2. CHECK DIM RELAY 
    1. Inspect the DIM relay. Refer to ON-VEHICLE INSPECTION [08/2015 - ] .

    NG → REPLACE DIM RELAY 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (DIM RELAY POWER SOURCE) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Relay Terminal 2 - Body ground Power switch off 11 to 14 V
      Relay Terminal 5 - Body ground Power switch off 11 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (DIM RELAY - INSTRUMENT PANEL JUNCTION BLOCK) 
    1. Disconnect the 2C instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Relay Terminal 1 - 2C-22 Always Below 1 Ω
      2C-22 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (DIM RELAY - HEADLIGHT ASSEMBLY) 
    1. Disconnect the A79 headlight assembly LH connector.
    2. Disconnect the A81 headlight assembly RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Relay Terminal 3 - A79-2 (SOL) Always Below 1 Ω
      Relay Terminal 3 - A81-2 (SOL) Always Below 1 Ω
      Relay Terminal 3 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly. Refer to REMOVAL [08/2015 - ] .
    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly. Refer to REMOVAL [08/2015 - ] .
      GTY481999Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2C-22 - MB-22 (DIM) Always Below 1 Ω
      2C-22 - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)

    NG → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 

  7. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2015 - ] 
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