LIGHTING SYSTEM(for LED Headlight) Front Fog Light Circuit

DESCRIPTION

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

WIRING DIAGRAM

B001EPHE02

CAUTION / NOTICE / HINT

Note


  • Inspect the fuse for circuits related to this system before performing the follow procedure.

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Using the GTS, perform the Active Test.

      Click here

      Main Body
      Tester Display Measurement Item Control Range Diagnostic Note
      Front Fog Light Relay Front fog lights OFF or ON -
      OK
      Front fog light relay operates (front fog lights turn on).
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - FOG LIGHT ASSEMBLY AND BATTERY)


    1. Disconnect the 2M driver side junction block assembly connector.

    2. Disconnect the B5 fog light assembly LH connector.

    3. Disconnect the B6 fog light assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2M-18 - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2M-19 - B5-2 (B) Always Below 1 Ω
      2M-19 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY


    1. B001HUUC02
      *a

      Component without harness connected

      (Driver Side Junction Block Assembly)

      Remove the driver side junction block assembly.

      Click here

    2. Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

      Click here

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2M-19 - Battery negative (-) terminal Battery not connected to 2M-18 and A-7 (FFGO) Below 1 V

      Battery positive (+) → 2M-18

      Battery negative (-) → A-7 (FFGO)

      		 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY Click here