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Sam, BMW Master technician
Category: BMW
Satisfied Customers: 1043
Experience:  BMW S.T.E.P. graduate, 10 years BMW dealership experience
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I have a remote key for a 2002 X5 with a dead battery. How

Customer Question

I have a remote key for a 2002 X5 with a dead battery. How do I open the key to change the battery?
Submitted: 7 years ago.
Category: BMW
Expert:  Sam replied 7 years ago.
Hello and welcome to Just Answer.

The battery in your key is not replaceable separately, it is a rechargeable battery that charges off of the ignition lock as the vehicle is driven. Note, the battery will only charge as the vehicle is driven, not just sitting with the engine running. There is no other way to charge the key battery.
Sam and other BMW Specialists are ready to help you
Customer: replied 7 years ago.
thanks for info on battery in key. Any idea why car won't open (have been driving it). It is 18 degrees. Could it be the cold?
Expert:  Sam replied 7 years ago.
I doubt it is the cold. Have you checked all the fuses in the front and rear fuse boxes?
Customer: replied 7 years ago.
have not checked fuses. Car is in church parking lot. Will go look at fuses and be back soon
Expert:  Sam replied 7 years ago.
I'll be here.