LIGHTING SYSTEM Rear Fog Light Circuit

DESCRIPTION

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

WIRING DIAGRAM

B002CF7E02

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK OPERATION (TAILLIGHTS)


    1. Check the operation of the taillights.

      OK
      Taillights operate normally.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. PERFORM ACTIVE TEST USING GTS (REAR FOG LIGHT RELAY)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch to ON.

    3. Turn the GTS on.

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

    5. Check that the relay operates.


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Rear Fog Light Relay Rear fog light relay ON/OFF Light control switch is 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

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

    NG

  3. CHECK HARNESS AND CONNECTOR (RR FOG RELAY INPUT VOLTAGE)


    1. Disconnect the No. 1 junction block assembly connector.

    2. B002E86C01
      *a

      Front view of wire harness connector

      (to No. 1 Junction Block Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      6B-3 - Body ground Taillights on 11 to 14 V
      6D-1 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT NO. 1 JUNCTION BLOCK ASSEMBLY


    1. Remove the No. 1 junction block assembly.

      Click here

    2. Connect a positive (+) lead from the battery to terminal 6B-3.

    3. Connect a negative (-) lead from the battery to terminal 6B-7.

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

      B002DJVC01
      *a

      Component without harness connected

      (No. 1 Junction Block Assembly)

      		 - -
      Standard Voltage
      Tester Connection Condition Specified Condition
      6A-5 - Battery negative (-) terminal Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE JUNCTION BLOCK COVER

    OK

  5. CHECK HARNESS AND CONNECTOR (NO. 1 JUNCTION ASSEMBLY - REAR LIGHT AND BODY)


    1. Disconnect the X1 rear light assembly LH connector.

    2. Disconnect the X10 rear light assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      6A-5 - X1-4(B) Always Below 1 Ω
      6A-5 - X10-4(B) Always Below 1 Ω
      6A-5 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (NO. 1 JUNCTION BLOCK ASSEMBLY - COWL SIDE JUNCTION BLOCK LH)


    1. Disconnect the 5C cowl side junction block LH connector.

    2. Disconnect the 6B No. 1 junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      6B-7 - 5C-16 Always Below 1 Ω
      6B-7 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT COWL SIDE JUNCTION BLOCK LH


    1. Remove the cowl side junction block LH.


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

    3. B002CG2C02
      *a

      Component without harness connected

      (Cowl Side Junction Block LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5C-16 - MB-27 (RFGO) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    NG

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here