LIGHTING SYSTEM Light Control Switch Circuit

DESCRIPTION

The main body ECU receives light control switch, dimmer switch and front fog light switch information signals from the headlight dimmer switch.

WIRING DIAGRAM

A01X4YBE02

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (HEADLIGHT DIMMER SWITCH)


    1. Operate the intelligent tester according to the display and select the "Data List".

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Dimmer SW Dimmer switch signal/ON or OFF

      ON: Dimmer switch on

      OFF: Dimmer switch off

      		 -
      Passing Light SW Passing light switch signal/ON or OFF

      ON: Passing light switch on

      OFF: Passing light switch off

      		 -
      Front Fog Light SW Front fog light switch signal/ON or OFF

      ON: Front fog light switch on

      OFF: Front fog light switch off

      		 -
      Rear Fog Light SW Rear fog light switch signal/ON or OFF

      ON: Rear fog light switch on

      OFF: Rear fog light switch off

      		 -
      Auto Light SW Auto light switch signal/ON or OFF

      ON: Auto light switch on

      OFF: Auto light switch off

      		 -
      Head Light SW (Head) Headlight switch signal/ON or OFF

      ON: Headlight switch (Head) on

      OFF: Headlight switch (Head) off

      		 -
      Head Light SW (Tail) Taillight switch signal/ON or OFF

      ON: Headlight switch (Tail) on

      OFF: Headlight switch (Tail) off

      		 -
      OK
      When combination light switch operation is performed, the result will be the same as above.

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY


    1. A01XAHAE03
      for LH Side
      *1 Component without harness connected: (Headlight Dimmer Switch Assembly)

      Remove the headlight dimmer switch Click here.

    2. for LH Side:


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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        18 (T) - 12 (EL) Light control switch tail Below 1 Ω
        20 (H) - 12 (EL) Light control switch head
        18 (T) - 12 (EL)
        19 (A) - 12 (EL) Light control switch AUTO
        4 (BFG) - 3 (LFG) Front fog light switch on
        2 (B) - 3 (LFG) Rear fog light switch on
        17 (HF) - 12 (EL) Dimmer switch flash
        11 (HU) - 12 (EL) Dimmer switch hi beam
    3. A01X7QRE02
      for RH Side
      *1 Component without harness connected: (Headlight Dimmer Switch Assembly)

      for RH Side:


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        13 (T) - 19 (EL) Light control switch tail Below 1 Ω
        11 (H) - 19 (EL) Light control switch head
        13 (T) - 19 (EL)
        12 (AUTO) - 19 (EL) Light control switch AUTO
        7 (BFG) - 8 (LFG) Front fog light switch on
        9 (B) - 8 (LFG) Rear fog light switch on
        14 (HF) - 19 (EL) Dimmer switch flash
        20 (HU) - 19 (EL) Dimmer switch hi beam

    NG

    REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND)


    1. Disconnect the E14 switch connector.

    2. for LH Side:


      1. Disconnect the E1, E2 and 2D ECU connectors.

        A01X1I5E02
        *1 Front view of wire harness connector: (to Headlight Dimmer Switch Assembly)
        *2 Front view of wire harness connector: (to Main Body ECU)
        *3 HEAD
        *4 TAIL

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        E14-4 (BFG) - E2-28 (FFOG) Always Below 1 Ω
        E14-2 (B) - E2-9 (RFGO)
        E14-19 (A) - E1-21 (A)
        E14-20 (H) - E2-17 (HEAD)
        E14-18 (T) - E1-23 (TAIL)
        E14-17 (HF) - E1-13 (HF)
        E14-11 (HU) - 2D-13 (HU)
        E14-12 (EL) - Body ground
        E14-3 (LFG) - Body ground
        E14-4 (BFG) - Body ground Always 10 kΩ or higher
        E14-2 (B) - Body ground
        E14-19 (A) - Body ground
        E14-20 (H) - Body ground
        E14-18 (T) - Body ground
        E14-17 (HF) - Body ground
        E14-11 (HU) - Body ground

    3. for RH Side:


      1. Disconnect the E1, E2 and 2D ECU connectors.

        A01X2FBE02
        *1 Front view of wire harness connector: (to Headlight Dimmer Switch Assembly)
        *2 Front view of wire harness connector: (to Main Body ECU)
        *3 HEAD
        *4 TAIL

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        E14-7 (BFG) - E2-28 (FFOG) Always Below 1 Ω
        E14-9 (B) - E2-9 (RFOG)
        E14-12 (A) - E1-21 (A)
        E14-11 (H) - E2-17 (HEAD)
        E14-13 (T) - E1-23 (TAIL)
        E14-14 (HF) - E1-13 (HF)
        E14-20 (HU) - 2D-13 (HU)
        E14-19 (EL) - Body ground
        E14-8 (LFG) - Body ground
        E14-7 (BFG) - Body ground Always 10 kΩ or higher
        E14-9 (B) - Body ground
        E14-12 (A) - Body ground
        E14-11 (H) - Body ground
        E14-13 (T) - Body ground
        E14-14 (HF) - Body ground
        E14-20 (HU) - Body ground

    OK

    REPLACE MAIN BODY ECU

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR