DYNAMIC RADAR CRUISE CONTROL SYSTEM ECU Power Source Circuit

DESCRIPTION

The driving support ECU assembly controls the dynamic radar cruise control system based on information sent from switches, sensors and ECUs.

This circuit provides power to operate the driving support ECU assembly.

WIRING DIAGRAM

A0004XRE60
*1 from IG1 NO. 4 Relay
*2 ECU-IG1 NO. 3
*3 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. A0004RRE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Driving Support ECU Assembly)

      Disconnect the H75 driving support ECU assembly connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H75-30 (B) - Body ground Power switch on (IG) 11 to 14 V

    4. Reconnect the H75 driving support ECU assembly connector.

    5. Turn the power switch off.


    NG

    REPAIR OR REPLACE POWER SOURCE CIRCUIT

    OK

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


    1. Disconnect the H75 driving support ECU assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      H75-25 (GND) - Body ground Always Below 1 Ω

    3. Reconnect the H75 driving support ECU assembly connector.


    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR