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 MANUALSSUBARU2007IMPREZA WRX F4-2.5L DOHC TURBOREPAIR AND DIAGNOSISCRUISE CONTROLDESCRIPTION AND OPERATIONCRUISE CONTROL SYSTEMFAIL-SAFE FUNCTION
2007 Subaru Impreza WRX F4-2.5L DOHC Turbo
Fail-Safe Function
2007 Subaru Impreza WRX F4-2.5L DOHC TurboSECTION Fail-Safe Function
FAIL-SAFE FUNCTION
The cruise control system has a fail-safe function that cancels the cruise control operation when any of the following conditions occurs.
CONFLICT BETWEEN CRUISE CONTROL SWITCHES AND CANCELLATION SIGNAL GENERATING SWITCHES
- The cruise control system is deactivated if any of the cruise control switches (SET/COAST, RESUME/ACCEL, and CANCEL switches) is turned ON while any of the cancellation signal generating switches (brake, stop light, clutch, neutral position and inhibitor switches) is activated. The system is re-activated when the cruise control switch is turned OFF and then turn ON again after the cancellation signal generating switch has been returned to its released position.
- When the ignition switch is turned ON while any of the command switches is in the ON position, the cruise control system is deactivated. The system deactivating function is retained until the ignition switch is turned OFF.
ABNORMALITIES IN ELECTRIC CIRCUITS
The cruise control system is deactivated and the set speed is also canceled if any of the following abnormalities occurs in the system electric circuits. The system deactivation function is retained until the ignition switch is turned OFF.
- Abnormality of the command switch is detected.
- Abnormality of the stop light switch and brake switch is detected.
- Abnormality of the inhibitor switch is detected. (AT)
- Abnormality of the neutral position switch is detected. (MT)
- Abnormality of the ignition switch is detected.
- Change in vehicle speed signal is detected.
- Abnormality in any of the engine related sensors is detected.
- Abnormality of the brake switch input circuit in the engine control module (ECM) is detected.
- The MAIN switch and command switch were already ON when the ignition switch is turned ON.
CRUISE CONTROL CANCEL FUNCTION
When any of the following conditions is met, the cruise control is cancelled.
To set the cruise control again, the vehicle speed must be returned to within the speed setting range and necessary conditions must be met.
- Abnormal engine speed acceleration is detected.
- The vehicle speed has dropped below the lower control limit during cruise control driving.
- The vehicle has been running at speed higher than the set speed for an abnormally long time during cruise controlled driving.
- The set speed became impossible to be maintained for some reason (steep upgrade, hand brake operation, abnormal engine power drop, etc.).
The cruise control system has a fail-safe function that cancels the cruise control operation when any of the following conditions occurs.
CONFLICT BETWEEN CRUISE CONTROL SWITCHES AND CANCELLATION SIGNAL GENERATING SWITCHES
- The cruise control system is deactivated if any of the cruise control switches (SET/COAST, RESUME/ACCEL, and CANCEL switches) is turned ON while any of the cancellation signal generating switches (brake, stop light, clutch, neutral position and inhibitor switches) is activated. The system is re-activated when the cruise control switch is turned OFF and then turn ON again after the cancellation signal generating switch has been returned to its released position.
- When the ignition switch is turned ON while any of the command switches is in the ON position, the cruise control system is deactivated. The system deactivating function is retained until the ignition switch is turned OFF.
ABNORMALITIES IN ELECTRIC CIRCUITS
The cruise control system is deactivated and the set speed is also canceled if any of the following abnormalities occurs in the system electric circuits. The system deactivation function is retained until the ignition switch is turned OFF.
- Abnormality of the command switch is detected.
- Abnormality of the stop light switch and brake switch is detected.
- Abnormality of the inhibitor switch is detected. (AT)
- Abnormality of the neutral position switch is detected. (MT)
- Abnormality of the ignition switch is detected.
- Change in vehicle speed signal is detected.
- Abnormality in any of the engine related sensors is detected.
- Abnormality of the brake switch input circuit in the engine control module (ECM) is detected.
- The MAIN switch and command switch were already ON when the ignition switch is turned ON.
CRUISE CONTROL CANCEL FUNCTION
When any of the following conditions is met, the cruise control is cancelled.
To set the cruise control again, the vehicle speed must be returned to within the speed setting range and necessary conditions must be met.
- Abnormal engine speed acceleration is detected.
- The vehicle speed has dropped below the lower control limit during cruise control driving.
- The vehicle has been running at speed higher than the set speed for an abnormally long time during cruise controlled driving.
- The set speed became impossible to be maintained for some reason (steep upgrade, hand brake operation, abnormal engine power drop, etc.).
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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.