LIGHTING SYSTEM Rear Fog Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the rear fog lights.

WIRING DIAGRAM

B004OW8E05

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.

PROCEDURE


  1. CHECK OPERATION (TAILLIGHTS)


    1. Check the operation of the taillights.

      OK
      Taillights operate normally.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  2. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power 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
      Rear Fog Light Relay Rear fog lights ON/OFF Light control switch in tail position

      Body Electrical > Main Body > Active Test
      Tester Display
      Rear Fog Light Relay
      OK
      Rear fog light relay operates. (Rear fog lights come on.)
      Result
      Proceed to
      OK
      NG

    OK
    NG
  3. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OR BODY GROUND)


    1. Disconnect the P7 rear light assembly RH connector.

    2. Disconnect the P8 rear light assembly LH connector.

    3. Disconnect the 3H instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3H-21 - P7-2 (B) Always Below 1 Ω
      3H-21 - P8-2 (B) Always Below 1 Ω
      3H-21 or P7-2 (B) - Body ground Always 10 kΩ or higher
      3H-21 or P8-2 (B) - Body ground Always 10 kΩ or higher
      P7-1 (E) - Body ground Always Below 1 Ω
      P8-1 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG
    OK
  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      Click here

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

    3. Connect a positive (+) lead from the auxiliary battery to terminal 3K-1.

    4. Connect a negative (-) lead from the auxiliary battery to terminal MB-14 (TRLY) and MB-27 (RFGO).

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

      B004QB1C02
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      - -
      Standard Voltage
      Tester Connection Condition Specified Condition
      3H-21 - Negative (-) auxiliary battery terminal Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK
    NG