Diagnosis instructions for service

NOTE: The only external way to establish if a set of wheel electronics has been installed is to examine the aluminium screw valve. The only way to check if the correct set of wheel electronics has been installed is by first dismantling the tire. Regrettably, for technical reasons, it is not possible to submit a query via the diagnosis system.

NOTE: Following wheel changes it is necessary to observe a stationary period of 8 minutes before proceeding to initialize the Tire Pressure Monitor.

NOTE: Note the preconditions for initialization.

An initialization of the tire pressure control must be performed in the following cases:

The tire pressure is changed.
A wheel exchange is carried out. The exchanged wheels must be equipped with the correct wheel electronics systems.
Axle-wise wheel exchange on the vehicle.
Diagnosis instruction

During the initialization process, the existing inflation pressure is transferred as a specification for the nominal pressure.

The driver is personally responsible for setting the correct inflation pressures on cold tires in accordance with the operating instructions. The initialization process is controlled from any of a variety of locations according to the specific model series (refer to the Owner's Handbook).

The DSC control unit checks the plausibility of the setpoint value before adopting it (minimum pressure). Any initialization is only possible if the inflation pressure in all wheels is at least 1.6 bar. If the tire pressure of one wheel falls below this limit, a Check Control message is issued immediately.

Remedy: Set inflation pressures to correct values then repeat the initialization process. Should the initialization process be forgotten following replacement of a wheel or the wheel electronics, the driver of a vehicle with iDrive will receive a request to perform the initialization.

The tire pressure increases by 0.1 bar per 10 °C increase in temperature. If the temperature-evaluated limit values are not reached, the Tire Pressure Monitor issues a Check Control message.

For successful completion of the wheel-assignment process, the vehicle must be driven for at least 8 minutes at a speed in excess of 30 km/h.

Technical modifications may be introduced at any time. Observe model-specific diagnostic information and any applicable service bulletins for updates.