PRE-CRASH SAFETY SYSTEM Power Source Circuit

DESCRIPTION

This circuit supplies power to the seat belt control ECU.

WIRING DIAGRAM

A005AGPE06

CAUTION / NOTICE / HINT

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 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.

      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

    GO TO LIGHTING SYSTEM Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (PGND CIRCUIT)


    1. A0059TSE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Seat Belt Control ECU)

      Disconnect the L2 seat belt control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L2-8 (PGND) - Body ground Always Below 1 Ω

    3. Reconnect the L2 seat belt control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (IG1 CIRCUIT)


    1. A005B08E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Seat Belt Control ECU)

      Disconnect the L3 seat belt control ECU connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L3-8 (IG1) - Body ground Power switch on (IG) 11 to 14 V

    4. Reconnect the L3 seat belt control ECU connector.


    NG

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - SEAT BELT CONTROL ECU) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (+B CIRCUIT)


    1. A005BPBE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Seat Belt Control ECU)

      Disconnect the L2 seat belt control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L2-7 (+B) - Body ground Power switch off 11 to 14 V

    OK

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

    NG

  5. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - SEAT BELT CONTROL ECU)


    1. Disconnect the 2A and 2B instrument panel junction block assembly connectors.

    2. Disconnect the L3 seat belt control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-5 - L2-7 (+B) Always Below 1 Ω
      2B-16 - L3-8 (IG1) Always Below 1 Ω
      L2-7 (+B) - Body ground Always 10 kΩ or higher
      L3-8 (IG1) - Body ground Always 10 kΩ or higher

    OK

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR