Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2012IS 250C V6-2.5L (4GR-FSE)REPAIR AND DIAGNOSISCRUISE CONTROLTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWDYNAMIC RADAR CRUISE CONTROL SYSTEMFAIL-SAFE CHART
2012 Lexus IS 250C V6-2.5L (4GR-FSE)
Fail-Safe Chart
2012 Lexus IS 250C V6-2.5L (4GR-FSE)SECTION Fail-Safe Chart
CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: FAIL-SAFE CHART
1. Constant speed control mode and vehicle-to-vehicle distance control mode:
Text in Illustration
HINT
If the following conditions are detected while the dynamic radar cruise control system is operating, the system clears the stored vehicle speed in the ECM and cancels the dynamic radar cruise control operation.
2. Vehicle-to-vehicle distance control mode:
Text in Illustration
HINT
If the following conditions are detected while the dynamic radar cruise control system is operating, the system clears the stored vehicle speed in the ECM and cancels the dynamic radar cruise control operation.
3. Vehicle-to-vehicle distance control mode:
Text in Illustration
HINT
If the following conditions are detected while the dynamic radar cruise control system is operating, the system maintains the stored vehicle speed in the ECM and cancels the dynamic radar cruise control operation.
4. Constant speed control mode and vehicle-to-vehicle distance control mode:
HINT
If the following conditions are detected while the dynamic radar cruise control system is operating, the system clears the stored vehicle speed and cancels the dynamic radar cruise control operation.
HINT
If the following conditions are detected while the dynamic radar cruise control system is operating, the system cancels the dynamic radar cruise control operation.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.