Quote:
Originally Posted by Swift135
If they send pressure data then why the hell can't the car work out which tyre is flat. You try it: drop 15PSI out of a tyre when the car is turned off and start it and drive away, it takes at least a minute for the chime and the tyre symbol to appear on the display then you have to walk around the car to see which tyre is down.
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That's a different system than what's being used in the US then. It's called an indirect measurement system, and sense pressure differences using wheel speeds. The Federal government has mandated the systems here to be able to sense actual pressure. I'm not sure about the current BMWs, but on a lot of cars (even cheap cars) you can display the tire pressure from wheel to wheel right down to a PSI. The alarm may not say specifically which tire is flat, but you can look on the display and see it very easily.
What they're using down under may not be the same right now. There's a pretty tight supply of the systems right now, so it's possible that the manufacturers are only using them where they're required until the production number come up.