LIGHTING SYSTEM IG Signal Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01W4F6E01

CAUTION / NOTICE / HINT

Note


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

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

PROCEDURE


  1. CHECK DTC (SMART ENTRY AND START SYSTEM (for Start Function))


    1. Check for DTCs Click here

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    GO TO SMART ENTRY AND START SYSTEM (for Start Function) Click here

    A

  2. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    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
      IG SW Engine switch on (IG) signal/ON or OFF

      ON: Engine switch on (IG)

      OFF: Engine switch off

      		 -
      OK
      Normal conditions listed above are displayed.

    OK

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

    NG

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


    1. Disconnect the 3E*1 or 3F*2 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
      3E-1 - Body ground*1 Always 11 to 14 V
      3F-1 - Body ground*2 Always 11 to 14 V

      • *1: for LHD

      • *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT 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.

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

      A01VZK8E02
      Text in Illustration
      *A for LHD *B for RHD
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3E-1 - MB-32 (IG)*1 Always 10 kΩ or higher
      3E-1 - MB-32 (IG)*1

      Battery positive (+) → 3A-27

      Battery negative (-) → 3B-7

      		 Below 1 Ω
      3F-1 - MB-32 (IG)*2 Always 10 kΩ or higher
      3F-1 - MB-32 (IG)*2

      Battery positive (+) → 3A-27

      Battery negative (-) → 3B-7

      		 Below 1 Ω

      • *1: for LHD

      • *2: for RHD


    OK

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

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here