Here's the DIY guys

http://www.bimmerfest.com/forums/showthread.php?t=315311

I'll be doing this to both my "dead" spares (///M & ZHP) soon

Once you replace the battery remember to do the following afterwards:

HOW PROGRAM THE REMOTE ( RE-INITIATE)

-you must follow and do all the following steps quickly but do it right.


1. Put the key in ignition switch it ON then OFF and quickly remove it.

2. Hold DOWN the UN-LOCK Button, then Press the LOCK Button 3 times.

3. Release the UN-Lock button, your door now should signal

4. Put the key back in the ignition switch it ON then OFF to finalize.