RDW system description
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RDW measures the wheel speeds on all four wheels, using the wheel speed sensors of the ABS/ASC or ABS/DSC system. It compares the wheel speeds of the diagonally opposite wheels and of the average speed.
In the event of a drop in tire pressure, the dynamic diameter of a wheel will change, leading to a changed wheel speed.
A drop in tire pressure of 30 ± 10 % can be detected on all wheels from about 15 km/h (10 mph) up to the vehicle's top speed.
If this value is exceeded, the driver will be warned via the instrument cluster as follows:
TIRE PRESSURE SPECIFICATION
| Loss of tire pressure | Warning |
|---|---|
| Loss of tire pressure of 30 ± 10 % | Red LED Text: "Tyre failure" Gong: yes The vehicle is not to be driven faster than 80 km/h (50 mph).
NOTE:
A cautious driving style with moderate forward and transverse acceleration will help to prolong the service life of the defective tire.
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