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Home >> Lexus >> 2017 >> RX 450h Base >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Cruise Control System (Diagnostics - Introduction) >> Cruise Control System >> Fail-Safe Chart [10/2015 - 12/2017] >> Fail-Safe Chart [10/2015 - 12/2017]
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Fail-Safe Chart [10/2015 - 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 hybrid vehicle control ECU assembly 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 in the electronically controlled brake system
  • Communication stop between skid control ECU assembly and hybrid vehicle control ECU assembly
 Cruise Control Malfunction Visit Your Dealer Illuminates Does not illuminate Sounds Power switch is turned off and back to on (IG) again.
If the following condition occurs, the hybrid vehicle control ECU assembly 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 in the hybrid control 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
  • Electronically controlled brake system 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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