PRE-CRASH SAFETY 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

B002CYGE02
*1 from LH-IG1 RLY1 Relay
*2 Driving Support ECU Assembly

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK DRIVING SUPPORT ECU ASSEMBLY (B VOLTAGE)


    1. B002EYQC36
      *a

      Front view of wire harness connector

      (to Driving Support ECU Assembly)

      Disconnect the K4 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 Switch Condition Specified Condition
      K4-7 (B) - Body ground Engine switch on (IG) 11 to 14 V

    4. Turn the engine switch off.

    5. Reconnect the K4 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. Disconnect the K4 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
      K4-28 (GND) - Body ground Always Below 1 Ω
      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