Key fob won't work even after changing battery, can only open and lock car using key, alarm won't shut off and keeps ringing

I would look into getting a new key fob and having it programmed to the vehicle. If not tben use the key and lock unlock the door to deactivate the security

There is a special procedure involved in keying your fob to your car once the battery has been changed. You must lock and open the door with your key. Turn the ignition to "on"(not start) then push the fob's open and close button, then shut off ignition. This procedure is done everything the key battery is changed. Hope this can help you!
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I recently changed the battery on my key fob for my ssanyong rexton. I then did the following for the key fob to make it work. 1. Enter vehicle and close all doors.

2. Put seatbelt on (or clip it into the buckle) to shut the warning buzzer off.

3. Put key in ignition, turn to run position but don't start it.

4. Press and hold both buttons on key fob until red light on fob stays on. Then let go of both buttons. Then pressed the alarm button then the panic button, somthing like that. To be fair the button sequence after the red light came on is a bit vague. The alarm was blaring so i was happy when it just stopped.

Vauxhall key fob re programming

and a few other links:

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If the passkey is messed up, there will be a light on the dash that says security, or have a picture of a car with a lock thru it. If there is no light when the key is turned forward, then its NOT a passkey problem.

try locking and unlocking drivers door lock with the key

Open the door and immediately place the key in the ignition, that will shut off the alarm. The batteries in the Keyfob are probably dead and need to be replaced. You will see that the keyfob can be opened, though do it carefully, and you can replace the batteries. This will fix the remote. You may also have a valet button in the car which temporarily disables the alarm and will keep the alarm from sounding if the door is opened.

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you may have a bad door switch, theres a switch on the drivers door lock, when door is unlocked with fob or key the switch is activeated to shut alarm down,the lock moves to hit switch with key or fob,so if the switch is bad it will not shut down alarm, i would start there,door panel has to be remove,then latch has to be remove to get to switch, then test with a meter see if it opens and closes the connection, hope this helps.

i have a rover 25 and the key fob is not opening the car i could use the key to open it but the alarm will go off and cant stop it without the fob...

hi seems like water is getting inside the drivers door and getting on the alarm switch inside the door or it could just be afaulty alarm switch its the micro switch that connects to the door lock yatse210456