DYNAMIC RADAR CRUISE CONTROL SYSTEM Cruise Control Switch Circuit

DESCRIPTION

The cruise control switch is used to turn the dynamic radar cruise control system on and off, as well as operate 8 functions: SET, -(COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, CANCEL and MODE. The SET, TAP-DOWN and - (COAST) functions, and the RES (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 it is being operated and turns off when it is released. The driving support ECU assembly then reads the voltage value that has been changed by the switch operation to control MODE, SET, -, RES, +, or CANCEL function. The dynamic radar cruise control system has 2 cruise control modes: constant speed control mode and vehicle-to-vehicle distance control mode.


WIRING DIAGRAM

A01MSADE03

CAUTION / NOTICE / HINT

Note


  • The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

    Click here

  • When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.

PROCEDURE


  1. READ VALUE ON GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Radar Cruise / Data List.

    5. Read the Data List according to the display on the GTS.


      Powertrain > Radar Cruise > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Cruise Control Main Switch Cruise control switch signal ON or OFF

      ON: Cruise control switch (ON/OFF button) pushed

      OFF: Cruise control switch (ON/OFF button) released

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

      ON: +/RES switch on

      OFF: +/RES switch off

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

      ON: -/SET switch on

      OFF: -/SET switch off

      		 -

      Powertrain > Radar Cruise > Data List
      Tester Display
      Cruise Control Main Switch
      RES/ACC Switch
      SET/COAST Switch
      OK
      When the cruise control switch is operated, the display changes as shown above.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. INSPECT CRUISE CONTROL SWITCH


    1. Remove the cruise control switch.

      Click here

    2. Inspect the cruise control switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CRUISE CONTROL SWITCH Click here

    OK

  3. CHECK CRUISE CONTROL SWITCH WIRE


    1. A01MTU5C07
      *a

      Front view of wire harness connector

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

      Front view of wire harness connector

      (to Cruise Control Switch)

      Remove the cruise control switch wire.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z5-1 (R/N) - B2 (R/N) Always Below 1 Ω
      z5-3 (CCS) - B3 (CCS) Always Below 1 Ω
      z5-4 (ECC) - B1 (ECC) Always Below 1 Ω
      z5-1 (R/N) or B2 (R/N) - Body ground Always 10 kΩ or higher
      z5-3 (CCS) or B3 (CCS) - Body ground Always 10 kΩ or higher
      z5-4 (ECC) or B1 (ECC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CRUISE CONTROL SWITCH WIRE Click here

    OK

  4. 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

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY Click here

    OK

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


    1. Disconnect the K26 spiral with sensor cable sub-assembly connector.

    2. Disconnect the M1 driving support ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K26-1 (CCS) - M1-23 (CCS) Always Below 1 Ω
      K26-8 (R/N) - M1-10 (CCHG) Always Below 1 Ω
      K26-2 (ECC) - Body ground Always Below 1 Ω
      K26-1 (CCS) or M1-23 (CCS) - Body ground Always 10 kΩ or higher
      K26-8 (R/N) or M1-10 (CCHG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR