PRE-CRASH SAFETY SYSTEM Power Source Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01EQ3VE01

INSPECTION PROCEDURE

Tech Tips

Start the engine before inspection. Check the IG1 NO. 1 relay or battery if the starting system does not start.

PROCEDURE


  1. INSPECT FUSE (ECU-IG No. 1, PSB)


    1. Remove the ECU-IG No. 1 and PSB fuses from the cowl side junction block LH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ECU-IG No. 1 fuse Always Below 1 Ω
      PSB fuse

    NG

    REPLACE FUSE

    OK

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


    1. A01EQFHE03

      Disconnect the E41 and E42 seat belt control ECU connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E42-8 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      E41-7 (+B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E41-8 (PGND) - Body ground Always Below 1 Ω
      Result
      Result Proceed to

      OK

      (for LHD)

      		 A

      OK

      (for RHD)

      		 B
      NG C

    B

    REPLACE SEAT BELT CONTROL ECU Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE SEAT BELT CONTROL ECU Click here