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Headlight Relay Circuit: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn Techstream on.
    4. Select the following menu items: Body Electrical / Main Body / Active Test.
    5. Check that the relays operate.
      MAIN BODY:

      Tester Display Test Part Control Range Diagnostic Note
      Headlight Relay Headlight Relay ON/OFF -

      OK

      Headlight relays operate. (LO-beam headlights illuminate.)

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

    NG: Go to next step 

  2. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 1: Instrument Panel Junction Block Assembly Connector Terminal
      GTY206511Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      ID-3 (HRLY) - Body ground Light control switch OFF → HEAD 10 to 14 V → Below 1 V

    OK → See step   6 

    NG: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (BATTERY - ENGINE ROOM J/B ASSEMBLY) 
    1. Disconnect the 1G engine room J/B assembly connector.
      Fig 2: Identifying Engine Room J/B Assembly
      GTY120225Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connector Condition Specified Condition
      1G-1 - Body ground Always 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. INSPECT ENGINE ROOM J/B BLOCK ASSEMBLY 
    1. Reconnect the 1G engine room J/B assembly connector.
    2. Disconnect the 1D engine room J/B assembly connector.
      Fig 3: Identifying 1D Engine Room J/B Assembly Connector Terminal
      GTY151337Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Condition Specified Condition
      1D-9 - Body ground Always 10 to 14 V

    NG → REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY (POWER DISTRIBUTOR) 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B ASSEMBLY - INSTRUMENT PANEL J/B ASSEMBLY) 
    1. Reconnect the 1D engine room J/B assembly connector.
    2. Disconnect the ID instrument panel J/B assembly connector.
      Fig 4: Identifying ID Instrument Panel J/B Assembly Connector Terminals
      GTY206483Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Condition Specified Condition
      ID-3 (HRLY) - Body ground Always 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

  6. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY 
    1. Remove the H-LP (RL) fuse and H-LP (LL) fuse from the engine room J/B assembly.
      Fig 5: Identifying H-LP (RL) Fuse And H-LP (LL) Fuse From Engine Room J/B Assembly
      GTY126727Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the loading slot of each fuse and body ground.

      Standard voltage

      Tester Connection Condition Specified Condition
      H-LP (RL) Terminal - Body ground Light control switch in HEAD 10 to 14 V
      H-LP (LL) Terminal - Body ground Light control switch in HEAD 10 to 14 V

    NG → REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY (POWER DISTRIBUTOR) 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (FUSE - BODY GROUND) 

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