42+ Bmw 5 Series Key Fob Background. Some bmw models such and e and 5 series e46 and e39 use rechargeable batteries. If you've tried replacing the battery and your key fob still isn't working, or if you've lost your fob entirely, it's time to get a new one.
If you've tried replacing the battery and your key fob still isn't working, or if you've lost your fob entirely, it's time to get a new one. Remove the key from ignition and press and hold the unlock button for 15 seconds during this time press the key lock button 3 times within 5 seconds. Easy to replace, just prise open fob.
Took it to locksmith and he said key fob was ok.
I wonder if both fobs have failed. Keep a spare battery somewhere as i have been locked out by a dud battery! Take the working key fob along with the ones you want to program inside the car with all doors and windows closed. Bmw 5 series since bmw 5 series key fob devices are not manual locks, hence breach sets quick alarms.