PRE-COLLISION SYSTEM ECU Power Source Circuit

DESCRIPTION

This circuit supplies power to the driving support ECU assembly when the engine switch is on (IG).

WIRING DIAGRAM

B0066VDE06
*1 from IG1 NO. 3 Relay
*2 ECU-IG1 NO. 2
*3 Driving Support ECU Assembly

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK DRIVING SUPPORT ECU ASSEMBLY (B VOLTAGE)


    1. B006825C08
      *a

      Front view of wire harness connector

      (to Driving Support ECU Assembly)

      Disconnect the Q2 driving support ECU assembly 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
      Q2-7 (B) - Body ground Engine switch on (IG) 11 to 14 V

    4. Turn the engine switch off.

    5. Reconnect the Q2 driving support ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  2. CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - BODY GROUND)


    1. B006825C09
      *a

      Front view of wire harness connector

      (to Driving Support ECU Assembly)

      Disconnect the Q2 driving support ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q2-28 (GND) - Body ground Always Below 1 Ω

    3. Connect the Q2 driving support ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR