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

A01X8PQE06

CAUTION / NOTICE / HINT

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.

    OK

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

    NG

  2. CHECK NO. 1 SWITCH WIRE


    1. A01WYZYE02
      *1 Front view of wire harness connector: (to Spiral Cable)
      *2 Front view of wire harness connector: (to Steering Pad Switch)

      Disconnect the A and z36 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
      z36-4 (DIST) - A-2 (DIST) Always Below 1 Ω
      z36-6 (ECC) - A-10 (ECC) Always Below 1 Ω

    NG

    REPLACE NO. 1 SWITCH WIRE

    OK

  3. INSPECT STEERING PAD SWITCH


    1. Disconnect the steering pad switch connector from the spiral cable.

      A01X7QME02
      *1 Front view of wire harness connector: (to Steering Pad Switch)
      *2 Distance Control Switch

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      4 (DIST) - 6 (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. 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.

      A01X49RE01
      *1 Component without harness connected: (Spiral Cable)

    2. 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
        z36-4 (DIST) - E12-11 (DIST) Always Below 1 Ω
        z36-6 (ECC) - E12-2 (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
        z36-4 (DIST) - E12-11 (DIST) Always Below 1 Ω
        z36-6 (ECC) - E12-2 (ECC)

    NG

    REPLACE SPIRAL CABLE Click here

    OK

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


    1. A01WYW3E01
      *1 Front view of wire harness connector: (to Spiral Cable)
      *2 Rear view of wire harness connector: (to Distance Control ECU)
      *3 MODE

      Disconnect the E108 distance control ECU connector.

    2. Disconnect the E12 spiral cable connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E12-2 (ECC) - Body ground Always Below 1 Ω
      E12-11 (DIST) - E108-16 (MODE) Always Below 1 Ω
      E12-11 (DIST) - Body ground Always 10 kΩ or higher

    OK

    REPLACE DISTANCE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR