LIGHTING SYSTEM Hazard Warning Switch Circuit

DESCRIPTION

the low beam headlights do not illuminate, or a communication malfunction is detected between the headlight assembly and main body ECU (multiplex network body ECU).

WIRING DIAGRAM


  1. w/ side turn signal light

    A004I1OE02

  2. w/o side turn signal light

    A004ISPE03

PROCEDURE


  1. CHECK VEHICLE TYPE


    1. Check vehicle type.

      Result
      Result Proceed to
      w/ side turn signal light A
      w/o side turn signal light B

    B

    READ VALUE USING GTS (HAZARD SWITCH) Click here

    A

  2. READ VALUE USING GTS (HAZARD SWITCH)


    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 / Main Body / Data List.

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

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Hazard Switch Hazard warning signal switch signal ON or OFF

      ON: Hazard switch on

      OFF: Hazard switch off

      		 -
      OK
      Normal conditions listed above are displayed.

    NG

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CLOCK ASSEMBLY (HAZARD WARNING SIGNAL SWITCH) ) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - TURN SIGNAL FLASHER ASSEMBLY)


    1. Disconnect the 3B instrument panel junction block assembly connector.

    2. Disconnect the D61 turn signal flasher assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-16 - D61-8 (EHW) Always Below 1 Ω
      3B-16 or D61-8 (EHW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

    2. A004JQ3E02
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Remove the main body ECU (network gateway ECU) from the instrument panel junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-14 - 3B-16 Always Below 1 Ω

    OK

    REPAIR TURN SIGNAL FLASHER ASSEMBLY Click here

    NG

    REPAIR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

  5. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CLOCK ASSEMBLY (HAZARD WARNING SIGNAL SWITCH) )


    1. Disconnect the 3B instrument panel junction block assembly connector.

    2. Disconnect the D18 clock assembly (hazard warning signal switch) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-14 - D18-7 Always Below 1 Ω
      D18-8 - Body ground Always Below 1 Ω
      D18-14 - Body ground Always Below 1 Ω
      3B-14 or D18-7 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT CLOCK ASSEMBLY (HAZARD WARNING SIGNAL SWITCH)


    1. Remove the clock assembly (hazard warning signal switch) Click here.

    2. Inspect the clock assembly (hazard warning signal switch) Click here.


    NG

    REPAIR CLOCK ASSEMBLY (HAZARD WARNING SIGNAL SWITCH) Click here

    OK

  7. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

    2. Remove the main body ECU (network gateway ECU) from the instrument panel junction block assembly.

      A004H4NE02

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-16 - MB-3 Always Below 1 Ω
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    OK

    REPAIR MAIN BODY ECU (NETWORK GATEWAY ECU)

    NG

    REPAIR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

  8. READ VALUE USING GTS (HAZARD SWITCH)


    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 / Main Body / Data List.

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

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Hazard Switch Hazard warning signal switch signal ON or OFF

      ON: Hazard switch on

      OFF: Hazard switch off

      		 -
      OK
      Normal conditions listed above are displayed.

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - TURN SIGNAL FLASHER ASSEMBLY)


    1. Disconnect the 3B instrument panel junction block assembly connector.

    2. Disconnect the D61 turn signal flasher assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-16 - D61-8 (EHW) Always Below 1 Ω
      3B-16 or D61-8 (EHW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

    2. A004JQ3E02
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Remove the main body ECU (network gateway ECU) from the instrument panel junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-14 - 3B-16 Always Below 1 Ω

    OK

    REPAIR TURN SIGNAL FLASHER ASSEMBLY Click here

    NG

    REPAIR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

  11. CHECK HARNESS AND CONNECTOR


    1. Disconnect the 3B instrument panel junction block assembly connector.

    2. Disconnect the D18 clock assembly (hazard warning signal switch) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-14 - D18-7 (HAZRD+) Always Below 1 Ω
      D18-8 (GND) - Body ground Always Below 1 Ω
      D18-14 (GND) - Body ground Always Below 1 Ω
      3B-14 or D18-7 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. INSPECT CLOCK ASSEMBLY (HAZARD WARNING SIGNAL SWITCH)


    1. Remove the clock assembly (hazard warning signal switch) Click here.

    2. Inspect the clock assembly (hazard warning signal switch) Click here.


    NG

    REPAIR CLOCK ASSEMBLY (HAZARD WARNING SIGNAL SWITCH) Click here

    OK

  13. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

    2. A004JQ3E02
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Remove the main body ECU (network gateway ECU) from the instrument panel junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-14 - 3B-33 Always Below 1 Ω

    OK

    REPAIR MAIN BODY ECU (NETWORK GATEWAY ECU)

    NG

    REPAIR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY