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

B006NB2E01

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.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    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
      Result Proceed to
      Taillights and license lights come on A
      Taillights and license lights do not come on B

    A

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

    B

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


    1. B006Q47C07
      *a

      Front view of wire harness connector

      (to Junction Block Assembly LH)

      Disconnect the junction block assembly LH connector.

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

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT JUNCTION BLOCK ASSEMBLY LH


    1. Remove the junction block assembly LH.

      Click here

      B006LGEE01

    2. Remove the main body ECU (multiplex network body ECU) from the junction block assembly LH.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4K-1 - 4H-15 Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      4A-14 - Battery negative (-) terminal Battery voltage applied between terminals 4K-1 and A-14 (TRLY) 11 to 14 V
      Battery voltage not applied between terminals 4K-1 and A-14 (TRLY) Below 1 V
      4H-15 - Battery negative (-) terminal Battery voltage applied between terminals 4K-1 and A-14 (TRLY) 11 to 14 V
      Battery voltage not applied between terminals 4K-1 and A-14 (TRLY) Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE JUNCTION BLOCK ASSEMBLY LH Click here