LIGHTING SYSTEM IG Signal Circuit

DESCRIPTION

This circuit detects the ignition switch ON or off condition, and sends it to the main body ECU (driver side junction block assembly).

WIRING DIAGRAM

A01EJYJE04
A01EIS6E04

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    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 Ignition switch or engine switch IG signal/ON or OFF

      ON: Ignition switch ON

      OFF: Ignition switch off

      		 -
      OK
      Normal conditions listed above are displayed.

    NG

    INSPECT IG1 RELAY Click here

    OK

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

  2. INSPECT IG1 RELAY


    1. A01EK6FE15
      Text in Illustration
      *1

      Component without harness connected

      (IG1 Relay)

      Remove the IG1 relay from the main body ECU (driver side junction block assembly).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kΩ or higher
      When battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE IG1 RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) - BATTERY AND BODY GROUND)


    1. A01ELS4E12
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))

      Disconnect the 2A main body ECU (driver side junction block assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2A-1 - Body ground Always 11 to 14 V
    3. A01EJ97E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))

      Disconnect the 2F main body ECU (driver side junction block assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2F-16 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK VEHICLE CONDITION


    1. Check the vehicle condition.

      Result
      Condition Proceed to
      w/o Smart Entry and Start System A
      w/ Smart Entry and Start System B

    B

    CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - MAIN BODY ECU) Click here

    A

  5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) - IGNITION SWITCH)


    1. A01EMQ3E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))
      *2

      Front view of wire harness connector

      (to Ignition Switch)

      Disconnect the D12 ignition switch connector.

    2. Disconnect the 2G main body ECU (driver side junction block assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2G-10 - D12-2 (AM1) Always Below 1 Ω
      2G-29 - D12-4 (IG1) Always Below 1 Ω
      2G-10 - Body ground Always 10 kΩ or higher
      2G-29 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT IGNITION SWITCH


    1. A01EKM8E15
      Text in Illustration
      *1

      Component without harness connected

      (Ignition Switch)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (AM1) - 4 (IG1) Ignition switch off 10 kΩ or higher
      Ignition switch ON Below 1 Ω

    NG

    REPLACE IGNITION SWITCH Click here

    OK

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here

  7. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - MAIN BODY ECU)


    1. A01EJ0JE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))

      Disconnect the 2G main body ECU (driver side junction block assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2G-29 - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here