Cruise Control: Description and Operation

The Cruise Control system enables the driver to preselect the speed of the car and then take his foot off the accelerator, leaving the system to keep the car travelling at the present speed. The driver sets the system by means of a switch on the combined dipswitch and direction-indicator stalk. The system will be switched out automatically when either the clutch pedal or brake pedal is depressed, when the switch is moved to the OFF or TIP position, when the selector lever is in the P position or when the TCS system is activated.

The Cruise Control system consists of the following components and signals:
- Control module
- Switches
- Brake and clutch pedal switches Brake light switch
- Speed signal from ABS control module
- Cruise Control signal active, to engine management system





Cars with TCS
On cars equipped with the Traction Control System (TCS), positive voltage from the brake light switch is supplied to terminal G (7) of the control module for the Cruise Control system via the TCS control module. This is to enable the TCS control module to switch out the Cruise Control system if wheelspin occurs for more than one second.

Cars with TRIONIC
On cars equipped with the TRIONIC engine management system and the Cruise Control system, the TRIONIC control module receives a signal from terminal J (9) of the control module for the Cruise Control system to the effect that the Cruise Control system is engaged.

This ensures smoother control of the car's speed.

Automatic transmission
The Cruise Control system is supplied with current from fuse 9 via the idling-speed compensation switch in the selector lever position sensor and also from fuse 22. This ensures that the system will be operative when the selector lever is in any of the drive positions (D, 3, 2, 1).