PRE-CRASH SAFETY SYSTEM Power Source Circuit

DESCRIPTION

This circuit supplies power to the seat belt control ECU.

WIRING DIAGRAM

A0161TZE06

INSPECTION PROCEDURE

Note

When the seat belt control ECU is replaced with a new one, Initialization must be performed Click here.

PROCEDURE


  1. INSPECT SEAT BELT CONTROL ECU (+B TERMINAL VOLTAGE)


    1. A0161G8E20

      Disconnect the negative (-) terminal cable from the battery.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

      When disconnecting the cable, some system need to be initialized after the cable is reconnected Click here.

    2. Disconnect the Q61 seat belt control ECU connector.

    3. Connect the negative (-) terminal cable to the battery.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      Q61-7 (+B) - Body ground Always 11 to 14 V

    5. Disconnect the negative (-) terminal cable from the battery.

    6. Reconnect the Q61 seat belt control ECU connector.

    7. Connect the negative (-) terminal cable to the battery.


    NG

    INSPECT FUSE (PSB FUSE) Click here

    OK

  2. INSPECT SEAT BELT CONTROL ECU (IG1 TERMINAL VOLTAGE)


    1. A0163IDE09

      Disconnect the negative (-) terminal cable from the battery.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

      When disconnecting the cable, some system need to be initialized after the cable is reconnected Click here.

    2. Disconnect the Q62 seat belt control ECU connector.

    3. Connect the negative (-) terminal cable to the battery.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      Q62-8 (IG1) - Body ground Engine switch on (IG) 10 to 14 V
      Q62-8 (IG1) - Body ground Engine switch off Below 1 V

    5. Disconnect the negative (-) terminal cable from the battery.

    6. Reconnect the Q62 seat belt control ECU connector.

    7. Connect the negative (-) terminal cable to the battery.


    NG

    INSPECT FUSE (ECU-IG RH FUSE) Click here

    OK

  3. INSPECT SEAT BELT CONTROL ECU (PGND CIRCUIT)


    1. A0161G8E21

      Disconnect the negative (-) terminal cable from the battery.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

      When disconnecting the cable, some system need to be initialized after the cable is reconnected Click here.

    2. Disconnect the Q61 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
      Q61-8 (PGND) - Body ground Always Below 1 Ω

    4. Reconnect the Q61 seat belt control ECU connector.

    5. Connect the negative (-) terminal cable to the battery.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PGND CIRCUIT)

    OK

    REPLACE SEAT BELT CONTROL ECU Click here

  4. INSPECT FUSE (PSB FUSE)


    1. A015YULE09

      Remove the PSB fuse from the cowl side J/B LH.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      PSB fuse Always Below 1 Ω

    3. Reinstall the PSB fuse to the cowl side J/B LH.


    NG

    REPLACE FUSE (PSB FUSE)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SEAT BELT CONTROL ECU - BATTERY)

  5. INSPECT FUSE (ECU-IG RH FUSE)


    1. A015YULE10

      Remove the ECU-IG RH fuse from the cowl side J/B RH.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      ECU-IG RH fuse Always Below 1 Ω

    3. Reinstall the ECU-IG RH fuse to the cowl side J/B RH.


    NG

    REPLACE FUSE (ECU-IG RH FUSE)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SEAT BELT CONTROL ECU - RH IG1 RELAY)