Lexus IS250 · Service Manual CRUISE CONTROL SYSTEM

FAIL-SAFE CHART

System information


Constant speed control mode and vehicle-to-vehicle distance control mode:
If the following conditions are detected while the dynamic radar cruise control system is in operation, the system clears the stored vehicle speed in the ECM and cancels the dynamic radar cruise control operation.
E117768E01
Vehicle Condition
 Auto Cancel Condition
 Fail-safe Deactivation Condition
  1. CRUISE main indicator light blinks
  2. Master warning light comes on
  3. "Check Cruise System" is displayed
  4. "Pong" warning sound is heard
  1. Open or short in stop light switch circuit
  2. Problem with vehicle speed signal
  3. Problem with throttle position sensor and motor
 Turn cruise control main switch ON again

Vehicle-to-vehicle distance control mode:
If the following conditions are detected while the dynamic radar cruise control system is in operation, the system clears the stored vehicle speed in the ECM and cancels the dynamic radar cruise control operation.
E117768E01
Vehicle Condition
 Auto Cancel Condition
 Fail-safe Deactivation Condition
  1. CRUISE main indicator light blinks
  2. Master warning light comes on
  3. "Check Cruise System" is displayed
  4. "Pong" warning sound is heard
  1. There is problem with millimeter wave radar sensor
  2. Beam axis of millimeter wave radar sensor deviates
 Engine switch ON (IG) again

Vehicle-to-vehicle distance control mode:
If the following conditions are detected while the dynamic radar cruise control system is in operation, the system maintains the stored vehicle speed in the ECM and cancels the dynamic radar cruise control operation.
E117747E01
Vehicle Condition
 Auto Cancel Condition
 Fail-safe Deactivation Condition
  1. Master warning light comes on
  2. "Clean Radar Sensor" is displayed
  3. "Pong" warning sound is heard
 There is dirt on millimeter wave radar sensor
 Recover from condition on left (RESUME operation is possible after recovery)
  1. Master warning light comes on
  2. "Cruise not Available" is displayed
  3. "Pong" warning sound is heard
  1. Wiper switch is in HI position
  2. ECT-SNOW switch is on
  3. Millimeter wave radar sensor is least sensitive because of bad weather such as rain, fog, snow, and sandstorms
  1. Recover from condition on left (RESUME operation is possible after recovery)
  2. Turn cruise control main switch ON again

Constant speed control mode and vehicle-to-vehicle distance control mode:
If the following conditions are detected while the dynamic radar cruise control system is in operation, the system clears the stored vehicle speed and cancels the dynamic radar cruise control operation.
Vehicle Condition
 Auto Cancel Condition
 Fail-safe Deactivation Condition
CRUISE main indicator light goes off
  1. Vehicle speed is lower than low speed limit (approx. 40 km/h (25 mph)) while running with cruise control on
  2. Vehicle speed is lower than stored vehicle speed by 16 km/h (9.9 mph) or more while running with cruise control on
  1. Push the cruise control main switch to RESUME/ACCEL
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