LIGHTING SYSTEM Taillight Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.

WIRING DIAGRAM


  1. B002C88E01

CAUTION / NOTICE / HINT

Note


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

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

  • The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. If a main body ECU (multiplex network body ECU) power source malfunction occurs, the door control battery may be malfunctioning.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (TAILLIGHT RELAY)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Perform the Active Test according to the display on the GTS.


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

      Body Electrical > Main Body > Active Test
      Tester Display
      Taillight Relay
      OK
      Taillight relay operates. (Taillights illuminate.)
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE - NO. 2 INTEGRATION RELAY)


    1. B002DFWC11
      *a

      Front view of wire harness connector

      (to No. 2 Integration Relay)

      Disconnect the No. 2 integration relay connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      2G-1 (ALT) - Body ground Always 11 to 14 V
      2B-7 (BATT) - Body ground
      2B-8 (IG1A) - Body ground Engine switch on (IG)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-10 (GNDB) - Body ground Always Below 1 Ω
      2A-22 (GNDA) - Body ground
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - COWL SIDE JUNCTION BLOCK LH)


    1. Disconnect the 2A No. 2 integration relay connector.

    2. Disconnect the 5D cowl side junction block LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-16 (TAIL) - 5D-11 Always Below 1 Ω
      2A-16 (TAIL) - Body ground 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT COWL SIDE JUNCTION BLOCK LH


    1. B002DWWE09

      Remove the cowl side junction block LH.

      Click here

    2. Remove the main body ECU from the cowl side junction block LH.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      MB-14 (TRLY) - 5D-11 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here