The reasons for the failure of the cruise switch are:
1. Fuses and relays: On some models, fuses and relays are used to protect the cruise control actuator circuit. If these two fail, the system will not work.
2. Cable harness: The cruise control switch of many models is installed on the steering wheel. When the harness connecting the switch fails, the cruise system cannot be controlled.
3. Control switch: The button generally has a life span. If the contact of the button is worn out, the cruise control switch cannot control the CCM. This may cause the car to disable the cruise system or fail to respond to cancellation or acceleration commands.