LIGHTING SYSTEM Light Control Switch Circuit

DESCRIPTION

The main body ECU (driver side junction block assembly) receives the following switch information:


WIRING DIAGRAM

A01EMRLE01

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Read the display on the GTS.

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

      ON: Dimmer switch in high or high flash (pass) position

      OFF: Dimmer switch in low position

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

      ON: Dimmer switch in high flash (pass) position

      OFF: Dimmer switch not in high flash (pass) position

      		 -
      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

      		 -
      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

      		 -
      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 in neither tail nor head position

      		 -
      OK
      Normal conditions listed above are displayed.

    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

    Tech Tips

    Inspect the items that did not change as a result of monitoring the Data List.


    1. A01EML1E95
      Text in Illustration
      *1

      Component without harness connected

      (Headlight Dimmer Switch Assembly)

      Remove the headlight dimmer switch assembly Click here.

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

      Standard Resistance
      Light Control Switch
      Tester Connection Switch Condition Specified Condition
      18 (T) - 12 (EL) Off 10 kΩ or higher
      19 (A) - 12 (EL) Off 10 kΩ or higher
      20 (H) - 12 (EL) Off 10 kΩ or higher
      18 (T) - 12 (EL) Tail Below 1 Ω
      18 (T) - 12 (EL) Head Below 1 Ω
      20 (H) - 12 (EL) Head Below 1 Ω
      19 (A) - 12 (EL) AUTO Below 1 Ω
      Dimmer Switch
      Tester Connection Switch Condition Specified Condition
      11 (HU) - 12 (EL) Low 10 kΩ or higher
      11 (HU) - 12 (EL) High Below 1 Ω
      12 (EL) - 17 (HF) Flash Below 1 Ω
      Fog Light Switch
      Tester Connection Switch Condition Specified Condition
      3 (LFG) - 4 (BFG) Off 10 kΩ or higher
      3 (LFG) - 4 (BFG) Front Below 1 Ω
      2 (RF) - 3 (LFG) Off 10 kΩ or higher
      2 (RF) - 3 (LFG) Rear Below 1 Ω

    NG

    REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - SWITCH ASSEMBLY)


    1. Disconnect the D33 headlight dimmer switch assembly connector.

      A01EL2EE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Headlight Dimmer Switch Assembly)

      		 *2

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))
      *3

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))

      		 *4

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))
      *5

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))

      		 - -

    2. Disconnect the D49, D50, 2K and 2N main body ECU (driver side junction block assembly) connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D33-4 (BFG) - D49-28 (FFOG) Always Below 1 Ω
      D33-2 (RF) - 2K-7 (RFOG) Always Below 1 Ω
      D33-11 (HU) - 2N-2 (HU) Always Below 1 Ω
      D33-17 (HF) - D50-13 (HF) Always Below 1 Ω
      D33-18 (T) - D50-23 (TAIL) Always Below 1 Ω
      D33-19 (A) - D50-21 (A) Always Below 1 Ω
      D33-20 (H) - D49-17 (HEAD) Always Below 1 Ω
      D33-3 (LFG) - Body ground Always Below 1 Ω
      D33-4 (BFG) - Body ground Always 10 kΩ or higher
      D33-2 (RF) - Body ground Always 10 kΩ or higher
      D33-11 (HU) - Body ground Always 10 kΩ or higher
      D33-17 (HF) - Body ground Always 10 kΩ or higher
      D33-18 (T) - Body ground Always 10 kΩ or higher
      D33-19 (A) - Body ground Always 10 kΩ or higher
      D33-20 (H) - Body ground Always 10 kΩ or higher
      D33-12 (EL) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here