Put key in ignition.
Turn key till dash warning ligth come on.
Press "open" button on fob.
If it works the locks will go down and up to show it has worked.
Get you replacement Vauxhall Corsa key fob and many other makes from <a href="http://www.keyfurb.com/?s=vauxhall+corsa"> Keyfurb.com</a>.
The battery is a CR2032, Vauxhall part number 90541381.
You do not have to reset the key fob when changing the battery.
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The key fob doesn't get reset... the keyless entry module gets programmed to accept commands from that key fob. If your key fob suddenly stops working and it's not a battery issue, then you either have a problem with your key fob itself, or the keyless entry module, and it'll need to be diagnosed and repaired accordingly.
Put the key in the ignition and turn the key 2 clicks to the On position and press and release the lock button on the fob. Then press and hold the unlock button on the fob 5 times and then release. This will reset the fob for your Mercedes.
use the key
nothing works and I replaced the battery. to the fob