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LIGHTING SYSTEM Light Control Switch Circuit

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DTC Code DTC Name
  Light Control Switch Circuit
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DESCRIPTION

The main body ECU receives the following signals:


Tip:

When performing troubleshooting, inspect the switch that is related to the malfunction. For example, if both right and left low beam headlights do not illuminate, read the light control switch HEAD signal value only in the Data List. If the value is normal, perform the headlight relay Active Test.

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WIRING DIAGRAM


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  1. A01CBX5E01

    for RHD

  2. A01CB1BE01

    for LHD

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

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

    5. Read the displays on the intelligent tester.

      Table 1. Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Dimmer Hi SW Dimmer switch HIGH signal / ON or OFF

      ON: Dimmer switch in HIGH

      OFF: Dimmer switch in LOW

      		 -
      Passing Light SW Dimmer switch FLASH signal / ON or OFF

      ON: Dimmer switch in HIGH FLASH (PASS)

      OFF: Dimmer switch not in HIGH FLASH (PASS)

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

      ON: Rear fog light switch on

      OFF: Rear fog 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

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

      ON: Light control switch in AUTO

      OFF: Light control switch not in AUTO

      		 -
      Headlight SW Light control switch HEAD signal / ON or OFF

      ON: Light control switch in HEAD

      OFF: Light control switch not in HEAD

      		 -
      Taillight SW Light control switch TAIL signal / ON or OFF

      ON: Light control switch in TAIL or HEAD

      OFF: Light control switch in neither TAIL nor HEAD

      		 -
      OK
      Normal conditions listed above are displayed.

  2. Click here

    INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY


    1. for RHD


      1. Remove the headlight dimmer switch assembly (Click here).

      2. A01CCB5E26

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

        Standard Resistance
        Light Control Switch
        Tester Connection Switch Condition Specified Condition
        19 (EL) - 13 (T) off 10 kΩ or higher
        13 (T) - 12 (A)
        12 (A) - 11 (H)
        19 (EL) - 13 (T) TAIL Below 1 Ω
        19 (EL) - 13 (T) HEAD Below 1 Ω
        13 (T) - 11 (H)
        19 (EL) - 12 (A) AUTO Below 1 Ω
        Dimmer Switch
        Tester Connection Switch Condition Specified Condition
        20 (HU) - 19 (EL) HIGH Below 1 Ω
        19 (EL) - 20 (HU) HIGH FLASH Below 1 Ω
        19 (EL) - 14 (HF) Below 1 Ω
        Front Fog Light Switch
        Tester Connection Switch Condition Specified Condition
        8 (LFG) - 7 (BFG) off 10 kΩ or higher
        on Below 1 Ω

    2. for LHD


      1. Remove the headlight dimmer switch assembly (Click here).

      2. A01CCB5E51

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

        Standard Resistance
        Light Control Switch
        Tester Connection Switch Condition Specified Condition
        12 (EL) - 18 (T) off 10 kΩ or higher
        18 (T) - 19 (A)
        19 (A) - 20 (H)
        12 (EL) - 18 (T) TAIL Below 1 Ω
        12 (EL) - 18 (T) HEAD Below 1 Ω
        18 (T) - 20 (H)
        12 (EL) - 19 (A) AUTO Below 1 Ω
        Dimmer Switch
        Tester Connection Switch Condition Specified Condition
        11 (HU) - 12 (EL) HIGH Below 1 Ω
        12 (EL) - 11 (HU) HIGH FLASH Below 1 Ω
        12 (EL) - 17 (HF) Below 1 Ω
        Front Fog Light Switch
        Tester Connection Switch Condition Specified Condition
        3 (LFG) - 4 (BFG) off 10 kΩ or higher
        on Below 1 Ω
        Rear Fog Light Switch
        Tester Connection Switch Condition Specified Condition
        2 (B) - 3 (LFG) off 10 kΩ or higher
        2 (B) - 3 (LFG) - 4 (BFG) on Below 1 Ω

  3. Click here

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT DIMMER SWITCH ASSEMBLY)


    1. for RHD


      1. A01CFC8E02

        Disconnect the G1 headlight dimmer switch assembly connector.

      2. Disconnect the G48, G49 and 4D main body ECU connectors.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        G1-7 (BFG) - G49-28 (FFOG) Always Below 1 Ω
        G1-7 (BFG) - Body ground Always 10 kΩ or higher
        G1-11 (H) - G49-17 (HEAD) Always Below 1 Ω
        G1-11 (H) - Body ground Always 10 kΩ or higher
        G1-12 (A) - G48-21 (A) Always Below 1 Ω
        G1-12 (A) - Body ground Always 10 kΩ or higher
        G1-13 (T) - G48-23 (TAIL) Always Below 1 Ω
        G1-13 (T) - Body ground Always 10 kΩ or higher
        G1-14 (HF) - G48-13 (HF) Always Below 1 Ω
        G1-14 (HF) - Body ground Always 10 kΩ or higher
        G1-20 (HU) - 4D-10 (HU) Always Below 1 Ω
        G1-20 (HU) - Body ground Always 10 kΩ or higher

    2. for LHD


      1. A01CFC8E03

        Disconnect the G1 headlight dimmer switch assembly connector.

      2. Disconnect the G48, G49 and 4D main body ECU connectors.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        G1-4 (BFG) - G49-28 (FFOG) Always Below 1 Ω
        G1-4 (BFG) - Body ground Always 10 kΩ or higher
        G1-20 (H) - G49-17 (HEAD) Always Below 1 Ω
        G1-20 (H) - Body ground Always 10 kΩ or higher
        G1-19 (A) - G48-21 (A) Always Below 1 Ω
        G1-19 (A) - Body ground Always 10 kΩ or higher
        G1-18 (T) - G48-23 (TAIL) Always Below 1 Ω
        G1-18 (T) - Body ground Always 10 kΩ or higher
        G1-17 (HF) - G48-13 (HF) Always Below 1 Ω
        G1-17 (HF) - Body ground Always 10 kΩ or higher
        G1-11 (HU) - 4D-10 (HU) Always Below 1 Ω
        G1-11 (HU) - Body ground Always 10 kΩ or higher
        G1-2 (B) - G49-9 (RFOG) Always Below 1 Ω
        G1-2 (B) - Body ground Always 10 kΩ or higher

  4. Click here

    CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - BODY GROUND)


    1. for RHD


      1. A01CF9RE01

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        G1-8 (LFG) - Body ground Always Below 1 Ω
        G1-19 (EL) - Body ground Always Below 1 Ω

    2. for LHD


      1. A01CF9RE03

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        G1-3 (LFG) - Body ground Always Below 1 Ω
        G1-12 (EL) - Body ground Always Below 1 Ω

  5. Click here

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  6. Click here

    REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLYClick here

  7. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. Click here

    REPLACE MAIN BODY ECUClick here