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

A003VJYE01

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 power switch on (IG).

    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 Power switch IG signal/ON or OFF

      ON: Power switch on (IG)

      OFF: Power switch off

      		 -
      OK
      Normal conditions listed above are displayed.

    NG

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - AUXILIARY 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 - AUXILIARY BATTERY AND BODY GROUND)


    1. Disconnect the 2E*1 or 2F*2 and 2B 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
      2E-1*1 - Body ground Power switch off 11 to 14 V
      2F-1*2 - Body ground Power switch off 11 to 14 V
      2B-25 - Body ground Power switch on (IG) 11 to 14 V

      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-4 - Body ground Always Below 1 Ω
      2B-6 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 NO.1 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.

      A003V1PE02
      Standard Resistance
      for LHD:
      Tester Connection Condition Specified Condition
      2E-1 - A-32 (IG) Always 10 kΩ or higher
      2E-1 - A-32 (IG)

      Auxiliary battery positive (+) → 2B-25

      Auxiliary battery negative (-) → 2B-6

      Auxiliary battery negative (-) → 2B-4

      		 Below 1 Ω
      for RHD:
      Tester Connection Condition Specified Condition
      2F-1 - A-32 (IG) Always 10 kΩ or higher
      2F-1 - A-32 (IG)

      Auxiliary battery positive (+) → 2B-25

      Auxiliary battery negative (-) → 2B-6

      Auxiliary battery negative (-) → 2B-4

      		 Below 1 Ω
      Text in Illustration
      *a

      Component with harness connected

      (Instrument panel junction block assembly)

      		 *b

      Component with harness connected

      (Instrument panel junction block assembly)
      *c

      Component with harness connected

      (Instrument panel junction block assembly)

      		 *d for LHD
      *e for RHD - -

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

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