DYNAMIC RADAR CRUISE CONTROL SYSTEM Distance Control Switch Circuit

DESCRIPTION

The distance control switch sets the vehicle-to-vehicle distance control mode. The distance control switch is installed in the steering pad switch. The vehicle-to-vehicle distance set value can be changed by operating the steering pad switch (distance control switch) while the dynamic radar cruise control system is in operation. The steering pad switch uses the CAN communication line to communicate with each ECU.

WIRING DIAGRAM

A01EQTFE03

INSPECTION PROCEDURE

CAUTION:

The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the Precaution for the SRS Click here.

Note

When the distance control ECU is replaced with a new one, initialization must be performed Click here.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (VEHICLE DISTANCE)


    1. Using the intelligent tester, read the Data List Click here.

      Radar Cruise
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Car Dist Time Setting

      Vehicle distance time setting condition /

      SHORT, LONG, MID or NO

      		 Vehicle distance selected by steering pad switch (distance control switch) -
      OK
      Normal conditions listed above are displayed.

    NG

    CHECK NO. 1 SWITCH WIRE Click here

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. CHECK NO. 1 SWITCH WIRE


    1. A01EMZ4E02

      Disconnect the A and z54 No. 1 switch wire connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z54-4 (DIST) - A-2 (DIST) Always Below 1 Ω
      z54-6 (ECC) - A-10 (ECC) Always Below 1 Ω

    NG

    REPLACE NO. 1 SWITCH WIRE

    OK

  3. INSPECT STEERING PAD SWITCH


    1. Remove the steering pad. Click here

      A01ENK1E01

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      2 (DIST) - 10 (ECC) Distance control switch on (pushed) Below 1 Ω
      Distance control switch off (pushed again) 1 MΩ or higher

    NG

    REPLACE STEERING PAD ASSEMBLY Click here

    OK

  4. INSPECT SPIRAL CABLE


    1. Remove the spiral cable Click here.

    2. Check the spiral cable and connector for scratches, cracks, dents and chips. If any defects are found, replace the spiral cable with a new one.

      A01EPESE06

    3. Check the spiral cable.


      1. Set the spiral cable to the center position Click here.

      2. After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise, and measure the resistance according to the value(s) in the table below. Then rotate the spiral cable 5 times counterclockwise, and measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        z54-4 (DIST) - E102-12 (DIST) Always Below 1 Ω
        z54-6 (ECC) - E102-2 (ECC)

      3. After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise. Then while rotating the spiral cable 5 times counterclockwise, measure the resistance according to the value(s) in the table below.

        Note

        As the spiral cable may break, do not rotate the spiral cable more than the specified amount.

        Standard Resistance
        Tester Connection Condition Specified Condition
        z54-4 (DIST) - E102-12 (DIST) Always Below 1 Ω
        z54-6 (ECC) - E102-2 (ECC)

    NG

    REPLACE SPIRAL CABLE Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - DISTANCE CONTROL ECU AND BODY GROUND)


    1. A01ES3PE02

      Disconnect the E86 distance control ECU connector.

    2. Disconnect the E102 spiral cable connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E102-2 (ECC) - Body ground Always Below 1 Ω
      E102-12 (DIST) - E86-16 (MODE) Always Below 1 Ω
      E102-12 (DIST) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE DISTANCE CONTROL ECU Click here