Cage Question about a 51 plate Vauxhall Astra

My mate replaced the battery on his key fob for the central locking. Assuming he put it in the right way (he's a sparky!) It now doesn't work. Any idea if you have to 'retune' the fob to the central locking system? This is my only thought other than it's fooked!

Any help given is greatly appereciated

once you take out the battery then "too late"I had to get mine retuned

just for replacing the battery? eh? dont do it on fords.

had this on the vectras

get inside the car turn the ignition on, then pres the close fob and open fob the door should lock and unlock,

also you might have to do it one click back on the key


this is only if the fob has already worked with this car if the fobs have never worked with the car then its a tech 2 job

apparently if you have a spare key ,the details can be scanned from that