Dynamic Radar Cruise Control System Road Test

Cruise Control System. Lexus Is250, Is220D. Gse20 Ale20
Cruise Control. Lexus Is250, Is220D. Gse20 Ale20

  1. PROBLEM SYMPTOM CONFIRMATION

Dynamic Radar Cruise Control System -- Road Test



PROBLEM SYMPTOM CONFIRMATION
HINT:
The dynamic radar cruise control system has two cruise control modes: the constant speed control mode and vehicle-to-vehicle distance control mode.
  1. The vehicle-to-vehicle distance control mode is always selected when starting up the dynamic radar cruise control system.
  2. Operation of the constant speed control mode is the same as that for a conventional cruise control system.


    Lexus Is250, Is220D. Gse20 Ale20

  1. Inspect the SET function.

    1. Turn the main switch on.

    2. Drive at the required speed (43 km/h (27 mph) or higher).

    3. Push the cruise control main switch to - (COAST)/SET.

    4. After releasing the switch, check that the vehicle cruises at the set speed.



    2. Lexus Is250, Is220D. Gse20 Ale20

  2. Inspect the ACCELERATION function.

    1. Turn the main switch on.

    2. Drive at the required speed (43 km/h (27 mph) or higher).

    3. Push the cruise control main switch to - (COAST)/SET.

    4. Check that vehicle speed increases while the cruise control main switch is pushed to + (ACCEL)/RES (RESUME), and that the vehicle cruises at the newly set speed when the switch is released.

    5. Push the cruise control main switch to + (ACCEL)/RES (RESUME) and then release it immediately. Check that vehicle speed increases* (tap-up control).

      HINT:
      *: Constant speed control mode: increases by 1.6 km/h (1.0 mph); vehicle-to-vehicle distance control mode: increases by 5 km/h (3 mph)


    3. Lexus Is250, Is220D. Gse20 Ale20

  3. Inspect the - (COAST) function.

    1. Turn the main switch on.

    2. Drive at the required speed (43 km/h (27 mph) or higher).

    3. Push the cruise control main switch to - (COAST)/SET.

    4. Check that vehicle speed decreases while the cruise control main switch is pushed to - (COAST)/SET, and the vehicle cruises at the newly set speed when the switch is released.

    5. Push the cruise control main switch to - (COAST)/SET, and then release it immediately. Check that vehicle speed decreases* (tap-down control).

      HINT:
      *: Constant speed control mode: decreases by 1.6 km/h (1.0 mph); vehicle-to-vehicle distance control mode: decreases by 5 km/h (3 mph).


    4. Lexus Is250, Is220D. Gse20 Ale20

  4. Inspect the CANCEL function.

    1. Turn the main switch on.

    2. Drive at the required speed (43 km/h (27 mph) or higher).

    3. Push the cruise control main switch to - (COAST)/SET.

    4. When performing any one of the following, check that the cruise control system is canceled and that the normal driving mode is reset.

      1. Depressing the brake pedal
      2. The shift lever is moved from the D to the N position or the transmission is shifted to the 3rd, 2nd, or 1st gear with the shift lever in the S position
      3. Turning the main switch off
      4. Pulling the cruise control main switch to CANCEL


    5. Lexus Is250, Is220D. Gse20 Ale20

  5. Inspect the RES (RESUME) function.

    1. Turn the main switch on.

    2. Drive at the required speed (43 km/h (27 mph) or higher).

    3. Push the cruise control main switch to - (COAST)/SET.

    4. Cancel the cruise control system by performing any of the above operations (other than turning the main switch off).

    5. After pushing the cruise control main switch to + (ACCEL)/RES (RESUME) at a driving speed of more than 40 km/h (25 mph), check that the vehicle resumes the speed set prior to the cancellation.

      HINT:
      The stored vehicle speed is retained even if vehicle speed drops below 40 km/h (25 mph) once. The previously stored vehicle speed can be resumed by pushing the cruise control main switch to + (ACCEL)/RES (RESUME) when vehicle speed returned to approximately 40 km/h (25 mph) or more.