PRE-CRASH SAFETY SYSTEM Power Source Circuit

DESCRIPTION

This circuit supplies power to the seat belt control ECU when the power switch is on (IG).

WIRING DIAGRAM

A01FR7UE04

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - BATTERY AND BODY GROUND)


    1. A01FTCRE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Seat Belt Control ECU)

      Disconnect the seat belt control ECU connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      U34-7 (+B) - Body ground Always 11 to 14 V
      U35-8 (IG1) - Body ground Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U34-8 (PGND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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