How to Replace the Battery in Your BMW Key


1. Turn your key over--with the BMW emblem facing away from you.
2. Press the button on the top-right side of the unit to release the integrated mechanical key. Pull the key out of the unit; this will expose the edge of the battery cover.
3. Flip open the battery cover with your fingernail. Pull the old battery out carefully.
4. Insert the new battery with the positive symbol (+) facing up. Close the battery cover. Re-insert the integrated mechanical key.