Body Electronics: IKE: Initialization: Notes

The system must be initialized for the particular set of tires used and the cold pressure specified. This process is initiated manually using the RDW button.

Procedure: switch on ignition and then press and hold the RDW switch for longer than 4 seconds. The control unit will then go into learn mode (initialization). The system then enters a learning phase. Due to the preset threshold values, this phase can last anywhere from 45 minutes to several hours depending on the driving style and number of data rejections. The system is ready to provide warnings after a minimum of approximately 10 minutes. It will then be able to detect pressure losses of 50% of the cold pressure. As the initialization progresses, the warning thresholds increase incrementally to 30% ±10% of the cold pressure.

The initialization routine can be interrupted as often as desired; interim results are stored in the control unit.

The system must be initialized if:

• The tire pressures are adjusted (must be set cold)
• The tire positions are altered (interchanged on the same axle or between axles)
• Tires are changed (new tires for old tires, summer tires for winter tires etc.)

False warnings may be given if initialization is not performed after pressures have been changed or a wheel/wheel position has been changed. False warnings may also be given if tires with large differences in the degree of ageing/wear are fitted on the same axle. When using a space saver spare tire the RDW cannot compensate for the difference in diameters of the wheels, in this case, initialization cannot be completed.