LIGHTING SYSTEM IG Signal Circuit

DESCRIPTION

This circuit detects the power switch on (IG) or off condition, and sends it to the main body ECU (multiplex network body ECU).

WIRING DIAGRAM

A003KKTE01

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • First, check for entry and start system (for Start Function) DTCs, and after confirming that there is no malfunction, proceed with troubleshooting.

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

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


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      IG SW Power switch on (IG) signal OFF or ON

      OFF: Power switch off

      ON: Power switch on (IG)

      		 "OFF" is also displayed for this item when the power switch is on (ACC).

      Body Electrical > Main Body > Data List
      Tester Display
      IG SW
      OK
      Normal conditions listed above are displayed.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3K-1 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    A003KC6C06
    *a

    Component without harness connected

    (Instrument Panel Junction Block Assembly)

    		 - -

    1. Remove the instrument panel junction block assembly.

      Click here

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

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3K-1 - MB-32 (IG) Auxiliary battery not connected to 3A-17 and 3D-3 10 kΩ or higher
      3K-1 - MB-32 (IG)

      Auxiliary battery positive (+) → 3A-17

      Auxiliary battery negative (-) → 3D-3

      		 Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here