Date registered: Nov 2005
Vehicle: '83 W123 200, '98 E200 Kompressor, (both Euro-spec., in Portugal), '08 B200
Location: Toronto, Canada
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From what I understand (either from the o/m or I picked it up somewhere else), the system doesn't use pressure sensors in the tire valves. It basically uses the speed sensors (from the ABS, ESP, etc. systems) to look for wheels spinning at different rates. A tire significantly underinflated will turn at a different rate (think of the tread being closer to the center of the wheel). I guess the computer is programmed to ignore a temporary deviation (let's say you spin the wheel while taking off from a light or a slippery road), but enough change for long enough and it'll post a warning.
Remember to always check tire pressures regularly, since the system only notices bigger pressure (well, speed) changes.
As always, if my understanding is off, please post.
(Re: compass - posted in the other thread, my o/m says B200 Turbo only, under compass, although the brochure says I should have it with the premium package).
edit: Ron - if it says range: 206km under the fuel menu then yes, distance to empty, but don't rely on it too much. The other pages in the fuel menu should be fuel avg. since start (I think for the day, it says time driven also), and fuel avg. since reset.
Paul (Paulo Santos)
'83 W123 200, '98 W210 E200K, '08 W245 B200
* Feel free to PM me if needed *
Last edited by pfsantos; 12-09-2011 at 01:41 PM.