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Home >> Lexus >> 2017 >> RX 350 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Cruise Control System - Diagnostics - Introduction >> Cruise Control System >> Fail-Safe Chart [09/2015 - 12/2017] >> Fail-Safe Chart [09/2015 - 12/2017]
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Fail-Safe Chart [09/2015 - 12/2017]

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If any of the following conditions are detected while the cruise control system is controlling vehicle speed, the system clears the vehicle speed stored in the ECM and cancels control of vehicle speed by the cruise control system.

Auto Cancel Condition Warning Fail-safe Deactivation Condition
Multi-information Display Master Warning Light Cruise Control Indicator Warning Buzzer
Open or short in stop light switch circuit Cruise Control Malfunction Visit Your Dealer Illuminates Does not illuminate Sounds Cruise control system is turned off and back on again using the cruise control main switch (ON/OFF button).
  • Problem with stop light switch input circuit
  • Problem with cruise control main switch cancel circuit
  • Malfunction is detected in the vehicle stability control system
  • Communication stop between skid control ECU (brake actuator assembly) and ECM
 Cruise Control Malfunction Visit Your Dealer Illuminates Does not illuminate Sounds Engine switch is turned off and back to on (IG) again.
If the following condition occurs, the ECM cancels control of vehicle speed by the cruise control system (Stored vehicle speed is maintained):
  • Vehicle speed is less than approximately 40 km/h (25 mph) while driving with the cruise control system controlling vehicle speed
 - Does not illuminate Illuminates - Cruise control main switch is pushed to +RES
Malfunction is detected in SFI system - Illuminates Does not illuminate - Cruise control system is turned off and back on again using the cruise control main switch (ON/OFF button).
Vehicle speed is less than stored vehicle speed by approximately 16 km/h (10 mph) or more - Does not illuminate Illuminates - Cruise control main switch is pushed to -SET
  • Vehicle stability control system operates while driving with cruise control system controlling vehicle speed
  • TRC system operates for a certain period of time while driving with cruise control system controlling vehicle speed.
  • TRC is turned off
  • VSC is turned off
 - Does not illuminate Illuminates - Cruise control main switch is pushed to +RES
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