My other car is a Mini
Join Date: Feb 2013
Location: South Australia
Local Time: 11:32 PM
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I had a similar problem with my MCS 2007, the boot button worked one day and then not the next. The local MINI garage wanted to charge $350 to replace the whole unit (number plate lights, handle, release button) but I politely declined and put up with using the key pad to release the boot. From time-to-time i'd try it and then after a year, one day it worked! Then after a few more weeks it didn't work, so I removed the unit (4 Torx screws and 1 small electrical connector) and pulled it apart by removing the number plate light lenses and the thin plastic cosmetic cover. Leave the number plate light lenses on though, don't need to remove them.
The actual switch is on a circuit board sealed within the unit, however some careful prying along the glued seam got the cover off to reveal the microswitch. The microswitch is about 1x1cm with a button on it. It should also have a plastic pad clipped over it with a clip on two sides. This is what the button pushes against when you push the button. On mine, one of the plastic clips had snapped so that the pad would come loose. A tiny dab of super glue on the microswitch button and replace the clip-on pad to glue it to the microswitch button, then more superglue to glue the cover back into place, clip the number plate light lenses back into place (no need to remove them really) and the cosmetic cover, then re-install, and it works!!
Well it worked for me...hope this helps.