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 operating 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. 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

A01GYPKE05

INSPECTION PROCEDURE

PROCEDURE


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


    1. Check the Data List for proper functioning of the cruise control switch Click here.

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

      ON: -/SET switch ON

      OFF: -/SET switch OFF

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

      ON: +/RES switch ON

      OFF: +/RES switch OFF

      		 -
      OK
      When cruise control switch operation is performed, the results will be same as above.

    NG

    INSPECT CRUISE CONTROL SWITCH Click here

    OK

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

  2. INSPECT CRUISE CONTROL SWITCH


    1. Remove the cruise control switch Click here.

    2. Inspect the cruise control switch Click here.


    NG

    REPLACE CRUISE CONTROL SWITCH Click here

    OK

  3. INSPECT SPIRAL CABLE SUB-ASSEMBLY


    1. Remove the spiral cable sub-assembly Click here.

    2. Inspect the spiral cable sub-assembly Click here.


    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    OK

  4. INSPECT CRUISE CONTROL SWITCH WIRE


    1. A01GZJPE01

      Disconnect the z2 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
      z2-3 - A-3 Always Below 1 Ω
      z2-4 - A-1 Always Below 1 Ω
      z2-1 - A-2 Always Below 1 Ω
      A-3 - Body ground Always 10 kΩ or higher
      A-1 - Body ground Always 10 kΩ or higher
      A-2 - Body ground Always 10 kΩ or higher

    NG

    REPLACE CRUISE CONTROL SWITCH WIRE Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - DRIVING SUPPORT ECU AND BODY GROUND)


    1. A01H0OWE04

      Disconnect the L126 cable connector.

    2. Disconnect the A33 ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L126-1 (CCS) - A33-27 (CCS) Always Below 1 Ω
      L126-8 (R/N) - A33-30 (CCHG) Always Below 1 Ω
      L126-2 (ECC) - Body ground Always Below 1 Ω
      L126-1 (CCS) - Body ground Always 10 kΩ or higher
      L126-8 (R/N) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE DRIVING SUPPORT ECU Click here