PRE-CRASH SAFETY SYSTEM Power Source Circuit

DESCRIPTION

This circuit supplies power to the seat belt control ECU.

WIRING DIAGRAM

A019LONE01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (PGND CIRCUIT)


    1. A019P6EE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Seat Belt Control ECU)

      Disconnect the 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
      F57-8 (PGND) - Body ground Always Below 1 Ω

    3. Reconnect the seat belt control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PGND CIRCUIT)

    OK

  2. CHECK HARNESS AND CONNECTOR (IG1 CIRCUIT)


    1. A019O8QE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Seat Belt Control ECU)
      *2

      Front view of wire harness connector

      (to Seat Belt Control ECU)

      Disconnect the seat belt control ECU connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F56-8 (IG1) - F57-8 (PGND) Engine switch on (IG) 11 to 14 V

    4. Reconnect the seat belt control ECU connector.


    NG

    INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (+B CIRCUIT)


    1. A019P6EE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Seat Belt Control ECU)

      Disconnect the 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
      F57-7 (+B) - Body ground Always 11 to 14 V

    3. Reconnect the seat belt control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+B CIRCUIT)

    OK

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

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      A019P2TE01
      Text in Illustration
      *1 Instrument Panel Junction Block Assembly

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2K-1 - 2D-30 Always 10 kΩ or higher
      2K-1 - 2D-30 When battery voltage applied to terminals 2A-20 and 2A-3 Below 1 Ω

    3. Reinstall the instrument panel junction block assembly.


    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    OK

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


    1. A019K9PE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Seat Belt Control ECU)
      *2

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      Disconnect the instrument panel junction block assembly connector.

    2. Disconnect the 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
      2D-30 - F56-8 (IG1) Always Below 1 Ω
      2D-30 - Body ground Always 10 kΩ or higher
      F56-8 (IG1) - Body ground Always 10 kΩ or higher

    4. Reconnect the seat belt control ECU connector.

    5. Reconnect the instrument panel junction block assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - SEAT BELT CONTROL ECU)

    OK

  6. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BODY GROUND)


    1. A019MVJE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      Disconnect the instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-3 - Body ground Always Below 1 Ω

    3. Reconnect the instrument panel junction block assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BODY GROUND)

    OK

  7. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - POWER MANAGEMENT ECU)


    1. A019NYME01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management ECU)
      *2

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      Disconnect the instrument panel junction block assembly connector.

    2. Disconnect the power management ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-20 - F8-20 (IG1D) Always Below 1 Ω
      2A-20 - Body ground Always 10 kΩ or higher
      F8-20 (IG1D) - Body ground Always 10 kΩ or higher

    4. Reconnect the power management ECU connector.

    5. Reconnect the instrument panel junction block assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - POWER MANAGEMENT ECU)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BATTERY)