LIGHTING SYSTEM Light Control Switch Circuit

DESCRIPTION

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

WIRING DIAGRAM

A005SZWE05

INSPECTION PROCEDURE

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

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

    5. According to the display on the intelligent tester, read 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*1 Front fog light switch signal / ON or OFF

      ON: Front fog light switch on

      OFF: Front fog light switch off

      		 -
      Rear Fog Light SW*2 Rear fog light switch signal / ON or OFF

      ON: Rear fog light switch on

      OFF: Rear fog light switch off

      		 -
      Auto Light SW*3 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 on

      OFF: Headlight switch off

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

      ON: Taillight switch on

      OFF: Taillight switch off

      		 -

      *1: w/ Front Fog Light

      *2: w/ Rear Fog Light

      *3: w/ Automatic Light Control System

      OK
      Tester display changes according to operation of each switch in the headlight dimmer switch.

    NG

    INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY Click here

    OK

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

  2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY


    1. A005UFNE02
      Text in Illustration
      *1

      Component without harness connected

      (Headlight Dimmer Switch Assembly)
      *2 w/ Front Fog Light
      *3 w/ Rear Fog Light
      *4 w/ Automatic Light Control System

      Remove the headlight dimmer switch Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      18 (T) - 12 (E) Light control switch TAIL Below 1 Ω
      Light control switch HEAD Below 1 Ω
      20 (H) - 12 (E) Light control switch HEAD Below 1 Ω
      19 (A) - 12 (E) Light control switch AUTO Below 1 Ω
      4 (BFG) - 3 (LFG) Front fog light switch on Below 1 Ω
      2 (B) - 3 (LFG) Rear fog light switch on Below 1 Ω
      17 (HF) - 12 (E) Dimmer switch high Below 1 Ω
      11 (HU) - 12 (E) Dimmer switch low Below 1 Ω

    NG

    REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY Click here

    OK

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


    1. A005SL8E03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Headlight Dimmer Switch Assembly)
      *2 w/ Front Fog Light
      *3 w/ Rear Fog Light
      *4 w/ Automatic Light Control System
      *5

      Front view of wire harness connector

      (to Main Body ECU)

      Disconnect the D7 headlight dimmer switch connector.

    2. Disconnect the D81, D79, and DJ main body ECU connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D7-4 (BFG) - D81-13 (FFOG) Always Below 1 Ω
      D7-2 (B) - D81-9 (RFOG) Always Below 1 Ω
      D7-19 (A) - D81-18 (A) Always Below 1 Ω
      D7-20 (H) - D81-12 (HEAD) Always Below 1 Ω
      D7-18 (T) - D79-21 (TAIL) Always Below 1 Ω
      D7-17 (HF) - D79-22 (HF) Always Below 1 Ω
      D7-11 (HU) - DJ-4 (HU) Always Below 1 Ω
      D7-4 (BFG) - Body ground Always 10 kΩ or higher
      D7-2 (B) - Body ground Always 10 kΩ or higher
      D7-19 (A) - Body ground Always 10 kΩ or higher
      D7-20 (H) - Body ground Always 10 kΩ or higher
      D7-18 (T) - Body ground Always 10 kΩ or higher
      D7-17 (HF) - Body ground Always 10 kΩ or higher
      D7-11 (HU) - Body ground Always 10 kΩ or higher
      D7-12 (E) - Body ground Always Below 1 Ω
      D7-3 (LFG) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU