Quote:
Originally Posted by ovekvam
What pressure was it initialized at?
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This is likely the issue.
I'm aware of users thinking they have initialized the system and have not even checked the tyre pressures first. There has to be the baseline reference, as has been stated. We need it to be of meaning, by being accurate.
The other issue is the system is not initialized correctly, some users think they have done it correctly, but not OK'd the action.
Note the pressure drop can be up to 30% before a warning is triggered. A tyre set at 35 psi should trigger before dropping past ~25 psi.
BMW Wrote:
Quote:
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.
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HighlandPete