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: 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

A01DQ41E05

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


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

      Radar Cruise
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      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. Remove the spiral cable sub-assembly Click here.

    2. A01DSJRE07

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

    3. 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. INSPECT CRUISE CONTROL SWITCH WIRE


    1. A01DPKLE19

      Disconnect the z7 spiral cable connector.

    2. Disconnect the A switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z7-3 (CCS) - A-3 (CCS) Always Below 2.5 Ω
      z7-4 (ECC) - A-1 (ECC)
      z7-1 (R/N) - A-2 (R/N)
      z7-3 (CCS) - Body ground Always 1 MΩ or higher
      z7-4 (ECC) - Body ground
      z7-1 (R/N) - Body ground

    NG

    REPLACE CRUISE CONTROL SWITCH WIRE

    OK

  4. INSPECT CRUISE CONTROL SWITCH


    1. Remove the cruise control switch Click here.

      A01DS80E02

    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 SUB-ASSEMBLY - ECM AND BODY GROUND)


    1. Disconnect the G40 spiral cable connector.

    2. Disconnect the G56*1 or G57*2 and G58*2 ECM connectors.


      • *1: for 1GR-FE

      • *2: for 1KD-FTV

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

      Standard Resistance
      for 1GR-FE
      Tester Connection Condition Specified Condition
      G40-1 (CCS) - G56-11 (CCS) Always Below 1 Ω
      G40-7 (R/N) - G56-17 (CCHG)
      G40-2 (ECC) - Body ground
      G40-1 (CCS) - Body ground Always 10 kΩ or higher
      G40-7 (R/N) - Body ground
      for 1KD-FTV
      Tester Connection Condition Specified Condition
      G40-1 (CCS) - G57-14 (CCS) Always Below 1 Ω
      G40-7 (R/N) - G58-9 (CCHG)
      G40-2 (ECC) - Body ground
      G40-1 (CCS) - Body ground Always 10 kΩ or higher
      G40-7 (R/N) - Body ground
      Result
      Result Proceed to
      OK (for 1GR-FE) A
      OK (for 1KD-FTV) B
      NG C

    B

    REPLACE ECM Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE ECM Click here