DYNAMIC RADAR CRUISE CONTROL SYSTEM ECU Power Source Circuit

DTC Code DTC Name
ECU Power Source Circuit

DESCRIPTION

This circuit provides power to operate the driving support ECU assembly. The driving support ECU assembly determines information about the vehicle in front based on data from the radar sensor, and then decides how much acceleration and/or deceleration is needed to maintain the set distance. The driving support ECU assembly also requests the skid control ECU to apply brakes and sounds the skid control buzzer.

WIRING DIAGRAM

B437481E06

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. E323582C55

      *a

      Front view of wire harness connector

      (to Driving Support ECU Assembly)

      Disconnect the G168 driving support ECU assembly connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G168-7 (B) - Body ground

      Ignition switch ON

      11 to 14 V*1

      10.5 to 16 V*2

      *1: w/o Stop and Start System

      *2: w/ Stop and Start System

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE POWER SOURCE CIRCUIT

    OK

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

    1. Disconnect the G168 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

      G168-28 (GND) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR