If the speed sensor fails the cruise control may stop working. If the brake pedal switch fails, the car may think the brakes are engaged and not allow the cruise control system to turn on.įailing Speed Sensor: A speed sensor has many purposes including indicating the speed of the vehicle, regulating flow of fuel and ignition timing, and operating the cruise control. Because cruise control systems have been designed to disengage when the brake pedal is pressed, the cruise control is wired to the brake pedal switch. When the fuse of for the cruise control blows, the cruise control will stop working altogether.įailing Brake Pedal Switch: The brake pedal switch turns on the vehicles brake lights when it senses that the brake pedal has been pressed. Service type Cruise control is not working Inspectionīad Fuse: Like many electronically controlled systems in your car, the cruise control has a corresponding fuse which will blow to protect the system if it senses a short circuit.
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