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


  1. B002D1CE01
    *a from Battery
    *b from Certification ECU (Smart Key ECU Assembly)
    *c Cowl Side Junction Block LH
    *d Main Body ECU (Multiplex Network Body ECU)

CAUTION / NOTICE / HINT

Note


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

  • Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).

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

PROCEDURE


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


    1. Clear the DTCs.

      Click here


      Body Electrical > Entry&Start > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > Entry&Start > Trouble Codes
      Result
      Result Proceed to
      Entry and Start System (for Start Function) DTCs are not output A
      Entry and Start System (for Start Function) DTCs are output B

    B

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

    A

  2. READ VALUE USING GTS (IG SW)


    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 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 Engine switch on (IG) signal ON or OFF

      ON: Engine switch on (IG)

      OFF: Engine switch off

      		 -

      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

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE - COWL SIDE JUNCTION BLOCK LH)


    1. B002DD4C02
      *a

      Front view of wire harness connector

      (to Cowl Side Junction Block LH)

      Disconnect the cowl side junction block LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      5E-1 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT COWL SIDE JUNCTION BLOCK LH


    1. Remove the cowl side junction block LH.

      Click here

    2. Remove the main body ECU (multiplex network body ECU) from the cowl side junction block LH.

      Click here

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

      B002EZIC01
      *a

      Component without harness connected

      (Cowl Side Junction Block LH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      5E-1 - MB-32 (IG) Battery not connected to 5A-35 and 5B-1 10 kΩ or higher
      5E-1 - MB-32 (IG)

      Battery positive (+) → 5A-35

      Battery negative (-) → 5B-1

      		 Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here