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      01-30-2013, 05:45 PM   #14
HighlandPete
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Drives: BMW F11 535i Touring
Join Date: Mar 2007
Location: Scotland, Highland Region

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NOTE: For those of us with the indirect system, is not a tyre pressure warning system, it is a puncture warning system.

We still need to regularly check tyre pressures and reset the sytem for accurate tyre working pressures. Particularly as we know all four tyre pressures can go down without any warning gong.


Quote:
BMW Wrote:

Tyre Puncture Warning System (TPWS)

The Tyre Puncture Warning System regularly monitors the tyre pressures of all four tyres by comparing their rotational speed when the vehicle is being driven. Whenever tyre pressure drops by approximately 30 per cent or more, the wheel's rolling radius changes significantly and rotates at a different speed from the other wheels. Via DSC's wheel-speed sensors, the Tyre Puncture Warning System recognises any such major deviation. Within one to three minutes, this system triggers a pressure-loss indication on the instrument panel, plus an audible warning. In a vehicle equipped with the iDrive interface, the warning appears on the Control Display.
HighlandPete
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