DYNAMIC RADAR CRUISE CONTROL SYSTEM Cruise Control Switch Circuit

DESCRIPTION

The cruise control switch operates 8 functions: SET, COAST, TAP-DOWN, RESUME, ACCEL, TAP-UP, CANCEL and MODE. The SET, TAP-DOWN and COAST functions and the RESUME, TAP-UP and ACCEL functions are operated with the same switch. The cruise control switch is an automatic return type switch which turns on only while pushing it in each arrow direction and turns off after releasing it. The internal contact point of the cruise control switch is turned on with the switch operation. The driving support ECU then reads the resistance value that has been changed by the switch operation to control MODE, SET, COAST, RESUME, ACCEL and CANCEL operations. The dynamic radar cruise control system has two cruise control modes: the constant speed control mode and vehicle-to-vehicle distance control mode.

Tech Tips


  • The vehicle-to-vehicle distance control mode is always selected when starting up the dynamic radar cruise control system.

  • The operation of the constant speed control mode is the same as the cruise control system.

WIRING DIAGRAM

A006V1VE01

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (CRUISE CONTROL SWITCH)


    1. Use the Data List to check if the cruise control switch is functioning properly.

      Radar Cruise
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Main SW S-CPU Cruise control switch (Sub CPU) signal / ON or OFF

      ON: Cruise control switch on

      OFF: Cruise control switch off

      		 -
      Main SW M-CPU Cruise control switch (Main CPU) signal / ON or OFF

      ON: Cruise control switch on

      OFF: Cruise control switch off

      		 -
      Cancel Switch Cancel switch signal / ON or OFF

      ON: Cancel switch on

      OFF: Cancel switch off

      		 -
      SET/COAST Switch -SET switch signal / ON or OFF

      ON: -SET switch on

      OFF: -SET switch off

      		 -
      RES/ACC Switch +RES switch signal / ON or OFF

      ON: +RES switch on

      OFF: +RES switch off

      		 -
      OK
      On screen, each item changes between ON and OFF according to above chart.

    NG

    INSPECT SPIRAL CABLE SUB-ASSEMBLY Click here

    OK

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

  2. INSPECT SPIRAL CABLE SUB-ASSEMBLY


    1. A006U9QE07

      If there are any defects as follows, replace the spiral cable with a new one: scratches, cracks, dents or chips on the connector or spiral cable.

    2. Check the spiral cable.


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

      2. 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.

        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
        3 (CCS) - 1 (CCS) Always Below 1 Ω
        4 (ECC) - 2 (ECC)
        1 (R/N) - 7 (R/N)

      3. Set the spiral cable to the center position and 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.

        Standard Resistance
        Tester Connection Condition Specified Condition
        3 (CCS) - 1 (CCS) Always Below 1 Ω
        4 (ECC) - 2 (ECC)
        1 (R/N) - 7 (R/N)

    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    OK

  3. CHECK CRUISE CONTROL SWITCH WIRE


    1. A006TMEE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Spiral Cable Sub-assembly)
      *2

      Front view of wire harness connector

      (to Cruise Control Switch)

      Disconnect the z5 spiral cable connector.

    2. Disconnect the z8 switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z5-3 (CCS) - z8-3 (CCS) Always Below 2.5 Ω
      z5-4 (ECC) - z8-1 (ECC)
      z5-1 (R/N) - z8-2 (R/N)
      z5-3 (CCS) - Body ground Always 1 MΩ or higher
      z5-4 (ECC) - Body ground
      z5-1 (R/N) - Body ground

    NG

    REPLACE CRUISE CONTROL SWITCH WIRE

    OK

  4. INSPECT CRUISE CONTROL SWITCH


    1. Remove the cruise control switch Click here.

      A006VAYE02

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      3 (CCS) - 1 (ECC) Cruise control switch on Below 2.5 Ω
      Cruise control switch off 1 MΩ or higher
      +RES switch held on 235 to 245 Ω
      -SET switch held on 617 to 643 Ω
      CANCEL switch held on 1509 to 1571 Ω
      2 (R/N) - 1 (ECC) MODE switch held on Below 2.5 Ω

    NG

    REPLACE CRUISE CONTROL SWITCH Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - ECM AND BODY GROUND)


    1. A006SJYE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Spiral Cable Sub-assembly)
      *2

      Front view of wire harness connector

      (to ECM)

      Disconnect the D5 spiral cable connector.

    2. Disconnect the A40 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D5-1 (CCS) - A40-23 (CCS) Always Below 1 Ω
      D5-7 (R/N) - A40-47 (CCHG)
      D5-2 (ECC) - Body ground
      D5-1 (CCS) - Body ground Always 10 kΩ or higher
      D5-7 (R/N) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here