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Taillight 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 relay operates.
      MAIN BODY:

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

      OK

      Taillight relay operates. (Taillights illuminate.)

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

    NG: Go to next step 

  2. INSPECT FUSE (TAIL) 
    1. Remove the TAIL fuse from the instrument panel J/B assembly.
    2. Measure the resistance of the fuse.

      Standard resistance

      Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  3. INSPECT TAILLIGHT RELAY 
    1. Remove the taillight relay from the instrument panel J/B assembly.
      Fig 1: Inspecting Taillight Relay
      GTY145079Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      Below 1 Ω (When battery voltage is applied to terminals 1 and 2)
      3 - 4 Below 1 Ω
      10 kΩ or higher (When battery voltage is applied to terminals 1 and 2)

    NG → REPLACE TAILLIGHT RELAY 

    OK: Go to next step 

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 2: Measure The Voltage
      GTY290143Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      IC-4 - Body ground Light control switch OFF → TAIL Below 1 V → 10 to 14 V
      IC-5 - Body ground Light control switch OFF → TAIL Below 1 V → 10 to 14 V
      IP-8 - Body ground Light control switch OFF → TAIL Below 1 V → 10 to 14 V

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND) 

    NG: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the IA instrument panel J/B assembly connector.
      Fig 3: Identifying IA Instrument Panel J/B Assembly Connector Terminals
      GTY206501Courtesy 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
      IA-1 - Body ground Always 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

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