If you ground the wire at the sensor the light will go off. Mine does not work either and the previous owner or a tech had cut back part of the wire sheath and attached a ground to it, just wrapped up and taped. Cheesy but it works still and I have had it for two years.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....