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Old 12-11-2012, 06:00 PM
DBell DBell is offline
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Location: Campbell, CA
Join Date: Sep 2007
Posts: 12
Mein Auto: 1999 528i
Replacing key buttons

Received new buttons and CR2016s.
Wife's key had nearly new buttons, as it turned out, but really weak battery. Works like new!

As for mine, repair levels I and II completed, but . . .
Can I go to level III and replace the contact film *under* the buttons?
Lock and Trunk are great, but Unlock was still dead.
Re-opened the patient, slipped off the film on the transmitter PCB and held it up to the light.
The carbon(?) film is totally gone under the Unlock bubble.
PCB pads look perfect, and the solder mask is intact except where the film makes contact.

N'mind! Eventually found the film on Ebay.
Not under BMW E39 key film, key repair (several shops, ALL in the UK?), but key parts.
Another whopping $2.84 w/free shipping!


Last edited by DBell; 12-11-2012 at 06:11 PM.
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