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LIGHTING SYSTEM IG Signal Circuit

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DTC Code DTC Name
  IG Signal Circuit
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DESCRIPTION

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

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WIRING DIAGRAM

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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.

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PROCEDURE


  1. Click here

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


    1. Check for DTCs (Click here)

      Table 1. Result
      Result Proceed to
      DTC is not output A
      DTC is output B

  2. Click here

    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 display on the GTS.

      Table 2. Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG SW Power switch on (IG) signal/ON or OFF

      ON: Power switch on (IG)

      OFF: Power switch off

      		 -
      OK
      Normal conditions listed above are displayed.

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


    1. Disconnect the 3E instrument panel junction block assembly connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3E-1 - Body ground Power switch off 11 to 14 V

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    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. A0008MHE05

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

      Table 3. Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

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

      Auxiliary battery positive (+) → 3A-27

      Auxiliary battery negative (-) → 3B-7

      		 Below 1 Ω

    • OK

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

    • NG

      REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (Click here)