Why don't 4S shops allow the installation of cruise control?

[McBrooke]

When purchasing a vehicle, some owners request 4S shops to install cruise control functionality, but some 4S shops advise against it. This is because installing a cruise control system differs from installing other vehicle accessories. The cruise control system needs to be connected to the engine control circuit, car airbags, and the central console. Such modifications can alter the original vehicle's circuitry and wiring, and improper installation may even damage the car. Cruise control systems, also known as speed control systems or autonomous driving systems, function by automatically maintaining the speed set by the driver without the need to press the accelerator pedal, allowing the vehicle to travel at a constant speed. Drawbacks of cruise control systems: They may malfunction, which can be extremely dangerous during high-speed driving. Cruise control is only suitable for use on highways or long-distance routes with light traffic and cannot be used on roads with complex conditions. When using cruise control, the driver's foot is freed from the accelerator pedal, leading to relaxation and reduced concentration. In emergency situations, this may delay braking response, resulting in untimely braking.