Special conditions for system function

The following driving conditions  may cause a delay in the warning  being given in the event of a drop in tire pressure:

• Heavy braking
• Rapid acceleration
• High rate of lateral acceleration
• Cornering (in a tight corner)
• Vehicle speed dropping below a minimum speed (the RPA only responds when a certain minimum speed has been reached)
• Large difference in slip (between axles or between wheel on one side of vehicle)
• Initialization not being completed in current speed range (see "Operation ")
• Winter conditions
• Heavy changes in load (only vehicles with electronic height control)

  The following operating conditions  may cause a delay in the warning  being given in the event of a drop in tire pressure:

• Driving with snow chains fitted

  Driving with snow chains may impair the correct function of the RPA.

  The system will work as normal again after the snow chains have been removed and the vehicle is driven for a few minutes. (Repeat initialization not necessary.)

  NOTE: Do not perform initialization when snow chains are fitted.

  Initialization and snow chains will cause incorrect adaptation values.

• Trailer towing

  Initialization should be performed when a trailer with a weight greater than approx. 300 kg is being towed.

  Repeat the initialization process after detaching or unloading the trailer.

• Old/new tires
  NOTE: Only fit tires with the same tread depth!

  Avoid fitting tires with greatly different tread depth (from approx. 2 millimeters) on one axle. The different diameters mean that the correct operation of the RPA is no longer guaranteed.

  The following situations may cause unnecessary warnings : 

  • Initialization not completed after a tire has been replaced (old/new tires, summer/winter tires, change in direction of rotation, or replacement of single defective tire) tire pressures have been changed
  • Tires have different levels of wear
  • Frequent changes in load (only on vehicles with electronic height control)
  • Tires that have not been approved by BMW
  • Damaged tires, even if no loss of pressure can be detected (e.g. spin imbalance)
  • Tyre has changed slightly during the running-in phase (settling)

  In the following cases, the system will not emit a warning despite a drop in tire pressure being detected : 

  • The same amount of pressure is lost in 2 or more tires.
  • Drops in tire pressures caused by diffusion and affecting all 4 tires equally
  • If a tire is damaged with a sudden loss of all pressure (tire blow-out, warning is given too late)