Quote:
Originally Posted by dcb
It's definitely correct for Canada...Seems odd that BMW would create 2 different TPMS for North America...I don't think they even price different owners manuals.
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It appears that BMW uses the indirect method (ABS sensors to measure wheel rotation differences) for most of the world.
US legislators have determined that the indirect method isn't good enough, and mandated a direct method (using pressure sensors inside the tires), so BMW cars sold in the US are equipped with both.
The US manual has an added paragraph on the sensors. It's really confusing, as having the sensors makes the indirect method unnecessary. But the manual talks about both and it's not clear which method is responsible for turning on the warning lights and when.