LIGHTING SYSTEM Rear Fog Light Circuit

DESCRIPTION

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

WIRING DIAGRAM

A003TSYE01
A003TIME06

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

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

    5. Check that the relay operates.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Rear Fog Light Relay Rear fog light relay ON/OFF Light control switch is in tail position
      OK
      Rear fog light relay operates. (Rear fog light comes on.)

    NG

    INSPECT REAR FOG LIGHT RELAY Click here

    OK

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

  2. INSPECT REAR FOG LIGHT RELAY


    1. A003U7SE87

      Remove the rear fog light relay from the No. 5 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage is applied between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE REAR FOG LIGHT RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (BATTERY - REAR FOG LIGHT RELAY)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Rear fog light relay terminal 2 - Body ground Light control switch off → tail Below 1 V → 11 to 14 V
      Rear fog light relay terminal 5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT - REAR FOG RELAY AND BODY GROUND)


    1. for LHD


      1. Disconnect the L36 rear combination light assembly connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Rear fog light relay Terminal 3 - L36-7 Always Below 1 Ω
        Rear fog light relay Terminal 3 - Body ground Always 10 kΩ or higher
        L36-5 - Body ground Always Below 1 Ω

    2. for RHD


      1. Disconnect the L36(*1) or M18(*2) rear combination light assembly connectors.

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

        Standard Resistance
        (*1)
        Tester Connection Condition Specified Condition
        Rear fog light relay Terminal 3 - L36-7 Always Below 1 Ω
        Rear fog light relay Terminal 3 - Body ground Always 10 kΩ or higher
        L36-5 - Body ground Always Below 1 Ω
        (*2)
        Tester Connection Condition Specified Condition
        Rear fog light relay Terminal 3 - M18-3 Always Below 1 Ω
        Rear fog light relay Terminal 3 - Body ground Always 10 kΩ or higher
        M18-5 - Body ground Always Below 1 Ω

        • *1: for Rear Fog Light LH Side Type

        • *2: for Rear Fog Light RH Side Type


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (REAR FOG LIGHT RELAY - INSTRUMENT PANEL JUNCTION BLOCK)


    1. Disconnect the 2B instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Rear fog light relay terminal 1 - 2B-26 Always Below 1 Ω
      2B-26 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. A003RW0E04
      Text in Illustration
      *1

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Remove the instrument panel junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-26 - A-27 (RFGO) Always Below 1 Ω
      2B-26 - Body ground Always 10 kΩ or higher

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)