DYNAMIC RADAR CRUISE CONTROL SYSTEM Cruise Control Switch Circuit

DESCRIPTION

The cruise control main 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 main 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 main 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

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INSPECTION PROCEDURE

Note

When replacing the driving support ECU, always replace it with a new one and be sure to perform initialization Click here. If an ECU which was installed to another vehicle is used, the information stored in the ECU will not match the information from the vehicle, and as a result, a DTC may be stored.

PROCEDURE


  1. READ VALUE USING GTS (CRUISE CONTROL MAIN 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 is on

      OFF: Cruise control switch is off

      		 -
      Distance Control Switch Distance control switch signal / ON or OFF

      ON: Distance control switch on

      OFF: Distance control switch off

      		 -
      SET/COAT 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
      When cruise control switch operation is performed, the results are same as above.

    NG

    INSPECT CRUISE CONTROL MAIN SWITCH Click here

    OK

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

  2. INSPECT CRUISE CONTROL MAIN SWITCH


    1. Remove the cruise control main switch Click here.

    2. Inspect the cruise control main switch Click here.


    NG

    REPLACE CRUISE CONTROL MAIN SWITCH Click here

    OK

  3. INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY


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

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


    NG

    REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY Click here

    OK

  4. INSPECT CRUISE CONTROL SWITCH WIRE

    A01FHD2E10
    Text in Illustration
    *A Connector A
    *a

    Front view of wire harness connector

    (to Spiral with Sensor Cable Sub-assembly Connector)
    *b

    Front view of wire harness connector

    (to Cruise Control Main Switch)

    1. Disconnect the spiral with sensor cable sub-assembly connector.

    2. Disconnect the cruise control main switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z8-1 - A-2 Always Below 1 Ω
      z8-3 - A-3 Always Below 1 Ω
      z8-4 - A-1 Always Below 1 Ω
      A-2 - Body ground Always 10 kΩ or higher
      A-3 - Body ground Always 10 kΩ or higher
      A-1 - Body ground Always 10 kΩ or higher

    NG

    REPLACE CRUISE CONTROL SWITCH WIRE

    OK

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


    1. Disconnect the N31 spiral with sensor cable sub-assembly connector.

    2. Disconnect the N5 driving support ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N31-1 (CCS) - N5-23 (CCS) Always Below 1 Ω
      N31-8 (R/N) - N5-10 (CCHG) Always Below 1 Ω
      N31-2 (ECC) - Body ground Always Below 1 Ω
      N31-1 (CCS) - Body ground Always 10 kΩ or higher
      N31-8 (R/N) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE DRIVING SUPPORT ECU Click here