LIGHTING SYSTEM Taillight Relay Circuit

DESCRIPTION

Illumination of the taillights and license plate light is controlled by the main body ECU (multiplex network body ECU).

WIRING DIAGRAM

B008IDXE05

CAUTION / NOTICE / HINT

Note


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

  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.*

    *: w/ Door Control Battery

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (TAILLIGHT RELAY)


    1. Using the GTS, perform the Active Test.

      Click here


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Taillight Relay Taillight relay ON or OFF -

      Body Electrical > Main Body > Active Test
      Tester Display
      Taillight Relay
      Result
      Proceed to
      Taillights and license lights come on
      Taillights and license lights do not come on

    Taillights and license lights come on

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

    Taillights and license lights do not come on

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


    1. Disconnect the instrument panel junction block assembly connector.

    2. B008JI0C04
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      4F-1 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      for LHD:

      Click here

      for RHD:

      Click here

      B008GL0E02

    2. Remove the instrument panel junction block assembly.

      for LHD:

      Click here

      for RHD:

      Click here

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      4A-37 - Battery negative (-) terminal Battery voltage applied between terminals 4F-1 and A-14 (TRLY) 11 to 14 V
      Battery voltage not applied between terminals 4F-1 and A-14 (TRLY) Below 1 V
      4A-38- Battery negative (-) terminal Battery voltage applied between terminals 4F-1 and A-14 (TRLY) 11 to 14 V
      Battery voltage not applied between terminals 4F-1 and A-14 (TRLY) Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here
    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for RHD: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here