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PRE-CRASH SAFETY SYSTEM Power Source Circuit

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DTC Code DTC Name
  Power Source Circuit
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DESCRIPTION

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

Table 1. *1 from Auxiliary Battery *2 from IG1 NO. 2 Relay *3 ECU-IG1 NO. 1 *4 Seat Belt Control ECU
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

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PROCEDURE


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


    1. A0008KBE01

      Disconnect the H77 and H78 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
      H77-7 (+B) - Body ground Always 11 to 14 V
      H78-8 (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
      H77-8 (PGND) - Body ground Always Below 1 Ω
      Table 2. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Seat Belt Control ECU)

    • OK

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

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR