LIGHTING SYSTEM Rear Fog Light Circuit

DTC Code DTC Name
Rear Fog Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives headlight dimmer switch information signals and illuminates the rear fog lights.

WIRING DIAGRAM

E270523E02

CAUTION / NOTICE / HINT

Note:

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

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

PROCEDURE

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

    1. Using the GTS, perform the Active Test.

      Click here

      Body Electrical > Main Body > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      Rear Fog Light Relay

      Rear fog light relay

      ON or OFF

      The headlight dimmer switch is in the 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

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    for LHD:

    Click here

    for RHD:

    Click here

    NG

  2. INSPECT REAR FOG LIGHT RELAY (FOG RR)

    1. E270109N02

      Remove the rear fog light relay from the No. 2 engine room relay block and junction block assembly.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3 - 5

      Battery voltage applied between terminals 1 and 2

      Below 1 Ω

      3 - 5

      Battery voltage not applied between terminals 1 and 2

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE REAR FOG LIGHT RELAY (FOG RR)

    OK

  3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY)

    1. E270517C01

      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      Remove the instrument panel junction block assembly connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      3A-1 - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (REAR FOG LIGHT RELAY [FOG RR] - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    1. Remove the rear fog light relay from the No. 4 relay block.

    2. Disconnect the 3C and 3D instrument panel junction block assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Rear fog light relay terminal 5 - 3C-25

      Always

      Below 1 Ω

      Rear fog light relay terminal 2 - 3D-52

      Always

      Below 1 Ω

      Rear fog light relay terminal 1 - 3C-38

      Always

      Below 1 Ω

      3C-25 - Body ground

      Always

      10 kΩ or higher

      3D-52 - Body ground

      Always

      10 kΩ or higher

      3C-38 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    1. E270524N01

      Remove the instrument panel junction block assembly.

      for LHD:

      Click here

      for RHD:

      Click here

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

      for LHD:

      Click here

      for RHD:

      Click here

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

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      3A-1 - 3C-25

      Always

      Below 1 Ω

      A-27 (RFGO) - 3D-52

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    for LHD:

    Click here

    for RHD:

    Click here