LIGHTING SYSTEM Taillight Relay Circuit

DESCRIPTION

The main body ECU receives headlight dimmer switch information signals and illuminates the clearance lights, taillights and license plate lights.

WIRING DIAGRAM

A01XFAZE10

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (TAILLIGHT RELAY)


    1. Using the intelligent tester, perform the Active Test Click here.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Taillight Relay Taillight relay ON/OFF -
      OK
      Taillight relay operates (taillights illuminate).

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU)


    1. A01XL0PE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Main Body ECU)

      Remove the main body ECU Click here.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A-14(TRLY) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY

    A01XHETE01

    1. Remove the driver side junction block assembly Click here.

    2. Remove the main body ECU from the driver side junction block assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-14(TRLY) - 2K-1 Always Below 1 Ω

    OK

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

    NG

    REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY