If you have Comfort Access, the battery does not charge. It takes a CR2032 coin battery that you can buy from anywhere.
Other than that, pay attention to how you're grabbing the handle. Is your thumb or any other part of your hand touching the lock ridges while you try to open the door? Only touch the inside of the door handle when unlocking.
AW/Terra | ZSP | ZPP | ZCW | iDrive | CA
Mods: BC BR coilovers | Blacklines | M-tech rear | dual exhaust | M3 steering wheel | BMW SSK | ZHP shift knob | High-kick CF spoiler | NBT Retrofit
M3 front control arms | M3 rear guide rods | Manzo rear toe and camber links | Monroe rear shock mounts | Varrstoen ES1 19x9.5+20 Front, 19x11+25 rear