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Taillight Relay Circuit: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    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
      Taillight Relay Taillight relay ON/OFF -

      OK

      Taillight relay operates. (Taillights illuminate.)

    NG → See step   2 

    OK → See step   6 

  2. INSPECT FUSE (TAIL) 
    1. Remove the TAIL fuse from the instrument panel junction block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      TAIL fuse Always Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  3. INSPECT TAILLIGHT RELAY (TAIL) 
    1. Remove the taillight relay from the instrument panel junction block.
      Fig 1: Inspecting Taillight Relay
      GTY300123Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      Apply the battery voltage between terminals 1 and 2 Below 1 Ω

    NG → REPLACE TAILLIGHT RELAY 

    OK: Go to next step 

  4. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) 
    1. Remove the TAIL fuse from the instrument panel junction block.
      Fig 2: Identifying TAIL Fuse Terminal
      GTY208128Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the loading slot of the TAIL fuse and body ground.

      Standard voltage

      Tester Connection Condition Specified Condition
      TAIL fuse terminal - Body ground Light control switch OFF → TAIL Below 1 V → 11 to 14 V

    NG → See step   5 

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

  5. CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK) 
    1. Disconnect the 1A instrument panel junction block connector.
      Fig 3: Checking Harness And Connector (Battery - Instrument Panel Junction Block)
      GTY206503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Condition Specified Condition
      1A-1 - Body ground Always 11 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

  6. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
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