The stable on-off control of automobile watering can usually depends on the following technical means:

1. Electric switch control: Automobile watering can is usually controlled by electric switch, and the driver starts and stops the water spraying operation through the windshield cleaning switch in the car. The electric switch can provide stable current output and ensure the accuracy and reliability of the switch action.

2. Control module: Some automobile watering cans are equipped with special control modules to monitor and control the working state of the water spraying pump. The control module can realize overload protection, short circuit protection and other functions, and ensure the stability and reliability of the watering can in the working process.

3. Sensor technology: Some high-end automobile watering cans adopt sensor technology, which can monitor the working state and environmental conditions of watering cans in real time, adjust the water spraying quantity and pressure according to the actual situation, and realize accurate on-off control.

4. Software control: Some car watering cans are also equipped with special control software, which can realize intelligent control and management. Software control can be set according to users' needs to provide personalized water spraying operation experience.

Generally speaking, the stable switch control of automobile watering can depends on the comprehensive application of various technical means such as electric switch, control module, sensor technology and software control. These technical means can ensure the stable and reliable switching operation of the watering can, provide an efficient and convenient cleaning experience, and ensure driving safety and driving comfort. If the switch control of the automobile watering can is unstable, it is suggested to check and maintain it in time to ensure its normal operation.