Tire pressure loss warning
This system analyses a range of measured variables and displays a visual prompt to check the tire pressure in case of deviations indicating falling tire pressure.
The tire pressure loss warning system operates on the basis of indirect measurements.
On detecting probable pressure loss in a tire a general warning appears on the display, prompting the driver to check the tire pressures.
In contrast to the tire pressure monitoring system, the tire pressure loss warning system performs indirect measurements without any additional sensors in the wheels. The ESP®-based system ("Active tire pressure monitoring" appears on the display) continuously compares the speeds of the wheels. The control unit additionally takes account of dynamic variables such as lateral acceleration, turn rate and wheel torque.
Should the system detect any conspicuous deviations which indicate declining air pressure in a tire, the warning "Check tire pressure" will appear in red letters on the central display. The system requires to be restarted via the operating menu after changing a tire or changing the air pressure in individual tires. The system is temporarily unable to provide warnings during the learning process which follows such a restart.