LIGHTING SYSTEM IG Signal Circuit

DESCRIPTION

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

WIRING DIAGRAM

B000ISGE01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

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

    5. Read the display on the intelligent tester.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG SW Ignition switch ON signal/ON or OFF

      ON: Ignition switch ON

      OFF: Ignition switch off

      		 -
      OK
      Normal conditions listed above are displayed.

    NG

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY AND BODY GROUND) Click here

    OK

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

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


    1. Disconnect the 3A, 3B, 3F*1 and 3E*2 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
      3F-1 - Body ground*1 Ignition switch off 11 to 14 V
      3E-1 - Body ground*2 Ignition switch off 11 to 14 V
      3A-27 - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-7 - Body ground Always Below 1 Ω

      • *1: for RHD

      • *2: for LHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 NO.2 RELAY)


    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.

      B000LYJE05
      Text in Illustration
      *a

      Component without harness connected

      (Instrument panel junction block assembly)

      		 *b for LHD
      *c for RHD - -
      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


    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

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