LIGHTING SYSTEM Taillight Relay Circuit

DESCRIPTION

The main body ECU controls the TAIL relay.

WIRING DIAGRAM

A01VHTME01

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Active Test.

    5. According to the display on the intelligent tester, perform the Active Test.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Taillight Relay Taillight relay OFF or ON -
      OK
      TAIL relay operates. (Clearance lights, taillights and license plate lights illuminate.)

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY)

    A01VG4FE01
    Text in Illustration
    *A for LHD
    *B for RHD
    *a

    Front view of wire harness connector

    (to Instrument Panel Junction Block Assembly)

    1. for LHD


      1. Disconnect the 3E instrument panel junction block assembly connectors.

    2. for RHD


      1. Disconnect the 3F instrument panel junction block assembly connectors.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      3E-1 - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      3F-1 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE MAIN BODY ECU


    1. Temporarily replace the main body ECU with a new functioning one Click here.


    NEXT

  4. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Active Test.

    5. According to the display on the intelligent tester, perform the Active Test.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Taillight Relay Taillight relay OFF or ON -
      OK
      TAIL relay operates. (Clearance lights, taillights and license plate lights illuminate.)

    OK

    END (MAIN BODY ECU DEFECTIVE)

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY