Discussion in 'E46 (1999-2006)' started by 109941, Dec 31, 2010.
The battery in the key for my 2003 330i seems to be dying. How do I replace it?
Are you sure it is the key? If so, I think you have to replace the entire key.
For me, it was a new GM5 module. I had the dealer do it, but here is a good writeup on the issue: http://www.bmwgm5.com/
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