LIGHTING SYSTEM Headlight Dimmer Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives the following switch information:



WIRING DIAGRAM


  1. for Light Control Switch LH Side Type

    B005OQHE01

  2. for Light Control Switch RH Side Type

    B005OQHE02

CAUTION / NOTICE / HINT

Note


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

  • The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before proceeding with troubleshooting, perform an on-vehicle inspection and confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*

    Click here


    • *: w/o Canister Pump Module with Door Ajar Warning Buzzer Function

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Dimmer SW Dimmer switch high position signal ON or OFF

      ON: Dimmer switch in high or high flash position

      OFF: Dimmer switch in low position

      		 -
      Passing Light SW Dimmer switch high flash position (pass) signal ON or OFF

      ON: Dimmer switch in high flash position

      OFF: Dimmer switch not in high flash position

      		 -
      Rear Fog Light SW Fog light switch rear position signal ON or OFF

      ON: Fog light switch in rear position

      OFF: Fog light switch off

      		 *
      Front Fog Light SW Fog light switch front position signal ON or OFF

      ON: Fog light switch in front position

      OFF: Fog light switch off

      		 -
      Auto Light SW Light control switch AUTO position signal ON or OFF

      ON: Light control switch in AUTO position

      OFF: Light control switch not in AUTO position

      		 -
      Head Light SW (Head) Light control switch head position signal ON or OFF

      ON: Light control switch in head position

      OFF: Light control switch not in head position

      		 -
      Head Light SW (Tail) Light control switch tail position signal ON or OFF

      ON: Light control switch in tail or head position

      OFF: Light control switch not in tail or head position

      		 -

      • *: w/ Rear Fog Light


      Body Electrical > Main Body > Data List
      Tester Display
      Dimmer SW
      Passing Light SW
      Rear Fog Light SW
      Front Fog Light SW
      Auto Light SW
      Head Light SW (Head)
      Head Light SW (Tail)
      OK
      Normal conditions listed above are displayed.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

    Tech Tips

    Inspect the items that did not change when reading the Data List.


    1. Remove the headlight dimmer switch assembly.

      Click here

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


      1. B005ODUC86
        *A w/ Rear Fog Light
        *a

        Component without harness connected

        (Headlight Dimmer Switch Assembly)

        for Light Control Switch LH Side Type:

        Standard Resistance
        Light Control Switch
        Tester Connection Condition Specified Condition
        18 (T) - 15 (EL) Light control switch off*2 10 kΩ or higher
        19 (H) - 15 (EL) Light control switch off*2 10 kΩ or higher
        20 (A) - 15 (EL) Light control switch off*2 10 kΩ or higher
        18 (T) - 15 (EL) Light control switch in tail position Below 1 Ω
        18 (T) - 15 (EL) Light control switch in head position Below 1 Ω
        19 (H) - 15 (EL) Light control switch in head position Below 1 Ω
        20 (A) - 15 (EL) Light control switch in AUTO position Below 1 Ω
        Dimmer Switch
        Tester Connection Condition Specified Condition
        16 (HL) - 15 (EL) Dimmer switch in low position Below 1 Ω
        14 (HU) - 15 (EL) Dimmer switch in high or high flash position Below 1 Ω
        17 (HF) - 15 (EL) Dimmer switch in high flash position Below 1 Ω
        Fog Light Switch
        Tester Connection Condition Specified Condition
        9 (BFG) - 8 (LFG) Fog light switch off 10 kΩ or higher
        9 (BFG) - 8 (LFG) Fog light switch in front position Below 1 Ω
        7 (B) - 8 (LFG)*1 Fog light switch off 10 kΩ or higher
        7 (B) - 8 (LFG)*1 Fog light switch in rear position Below 1 Ω

        • *1: w/ Rear Fog Light

        • *2: w/ Light Control Switch Off Position

      2. B005ODUC87
        *A w/ Rear Fog Light
        *a

        Component without harness connected

        (Headlight Dimmer Switch Assembly)

        for Light Control Switch RH Side Type:

        Standard Resistance
        Light Control Switch
        Tester Connection Condition Specified Condition
        13 (T) - 16 (EL) Light control switch off*2 10 kΩ or higher
        12 (H) - 16 (EL) Light control switch off*2 10 kΩ or higher
        11 (A) - 16 (EL) Light control switch off*2 10 kΩ or higher
        13 (T) - 16 (EL) Light control switch in tail position Below 1 Ω
        13 (T) - 16 (EL) Light control switch in head position Below 1 Ω
        12 (H) - 16 (EL) Light control switch in head position Below 1 Ω
        11 (A) - 16 (EL) Light control switch in AUTO position Below 1 Ω
        Dimmer Switch
        Tester Connection Condition Specified Condition
        15 (HL) - 16 (EL) Dimmer switch in low position Below 1 Ω
        17 (HU) - 16 (EL) Dimmer switch in high or high flash position Below 1 Ω
        14 (HF) - 16 (EL) Dimmer switch in high flash position Below 1 Ω
        Fog Light Switch
        Tester Connection Condition Specified Condition
        2 (BFG) - 3 (LFG) Fog light switch off 10 kΩ or higher
        2 (BFG) - 3 (LFG) Fog light switch in front position Below 1 Ω
        4 (B) - 3 (LFG)*1 Fog light switch off 10 kΩ or higher
        4 (B) - 3 (LFG)*1 Fog light switch in rear position Below 1 Ω

        • *1: w/ Rear Fog Light

        • *2: w/ Light Control Switch Off Position

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the J8 main body ECU (multiplex network body ECU) connector.

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


      1. for Light Control Switch LH Side Type:

        Standard Resistance
        Tester Connection Condition Specified Condition
        J28-9 (BFG) - J8-26 (FFOG) Always Below 1 Ω
        J28-7 (B) - J8-23 (RFOG)* Always Below 1 Ω
        J28-14 (HU) - J8-24 (HU) Always Below 1 Ω
        J28-17 (HF) - J8-10 (HF) Always Below 1 Ω
        J28-18 (T) - J8-22 (TAIL) Always Below 1 Ω
        J28-19 (H) - J8-12 (HEAD) Always Below 1 Ω
        J28-20 (A) - J8-8 (A) Always Below 1 Ω
        J28-9 (BFG) or J8-26 (FFOG) - Body ground Always 10 kΩ or higher
        J28-7 (B) or J8-23 (RFOG) - Body ground* Always 10 kΩ or higher
        J28-14 (HU) or J8-24 (HU) - Body ground Always 10 kΩ or higher
        J28-17 (HF) or J8-10 (HF) - Body ground Always 10 kΩ or higher
        J28-18 (T) or J8-22 (TAIL) - Body ground Always 10 kΩ or higher
        J28-19 (H) or J8-12 (HEAD) - Body ground Always 10 kΩ or higher
        J28-20 (A) or J8-8 (A) - Body ground Always 10 kΩ or higher
        J28-15 (EL) - Body ground Always Below 1 Ω
        J28-8 (LFG) - Body ground Always Below 1 Ω

        • *: w/ Rear Fog Light

      2. for Light Control Switch RH Side Type:

        Standard Resistance
        Tester Connection Condition Specified Condition
        J28-2 (BFG) - J8-26 (FFOG) Always Below 1 Ω
        J28-4 (B) - J8-23 (RFOG)* Always Below 1 Ω
        J28-17 (HU) - J8-24 (HU) Always Below 1 Ω
        J28-14 (HF) - J8-10 (HF) Always Below 1 Ω
        J28-13 (T) - J8-22 (TAIL) Always Below 1 Ω
        J28-12 (H) - J8-12 (HEAD) Always Below 1 Ω
        J28-11 (A) - J8-8 (A) Always Below 1 Ω
        J28-2 (BFG) or J8-26 (FFOG) - Body ground Always 10 kΩ or higher
        J28-4 (B) or J8-23 (RFOG) - Body ground* Always 10 kΩ or higher
        J28-17 (HU) or J8-24 (HU) - Body ground Always 10 kΩ or higher
        J28-14 (HF) or J8-10 (HF) - Body ground Always 10 kΩ or higher
        J28-13 (T) or J8-22 (TAIL) - Body ground Always 10 kΩ or higher
        J28-12 (H) or J8-12 (HEAD) - Body ground Always 10 kΩ or higher
        J28-11 (A) or J8-8 (A) - Body ground Always 10 kΩ or higher
        J28-16 (EL) - Body ground Always Below 1 Ω
        J28-3 (LFG) - Body ground Always Below 1 Ω

        • *: w/ Rear Fog Light

      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR