Landrover discovery 2 key fob did not open car changed batery in fob but still does not open doors there is a red light workink on fob open door with key but alarm goes off .

Hi
The key should always manually open the door.
Once in the car you can get someone to carry out a diagnostic test to confirm what part has failed.

This might sound to easy but isn't there a key slot in the door to unlock the door manually?

Change the batteries of the key fob

or chnage the car battery

The immobilizer systems on these vehicles can only be accessed and programmed by a dealer or a shop with a T4 or Autologic scantool system. Typically, replacing batteries in a fob should not present any new issues. Try manually locking the vehicle with the key. One turn to the right with the key in the driver door should lock the whole vehicle, activate the alarm which is indicated by one horn beep, a flash of the parking lights & a rapid flashing of the red light on the dash. After less than a minute, the red light should go to a slower flash and the vehicle is now armed. By placing the key back in the drivers door, one turn to the left should de-activate the alarm and a second turn should un-lock the rest of the vehicle and it should start. If this does not work then the key may not be communicating with the vehicle and may need to be re-programmed. Make sure the batteries in the fob are correct, installed correctly and of good quality. If you do need to have the key re-programmed, make sure you have all the keys so that they can all be done at the same time. Most local shops do not have the capability to access the immobilization systems on these vehicles.

hold the cetral locking lock all button down until the doors lock and unlock. The imobilser light goes solid red. At this point you have 10 to press the botton on your key 2 times . the doors will unlock and lock.

The red light means the Immobiliser has not been turned off, the deactivator in the key must not be working correctly, visit your local land rover dealer who will be able to make sure the key is paired to the car correctly, otherwise you may need a new key.

it sound like a broken door latch there is a spring inside which breaks you used to have to replace the whole latch but i think there are repair kits available from some independant parts specialists.

if it is a mems unit , it will need to be programed to the key fob and alarm . (there is no way round it).

take off the logo on the rear door and spray some wd40 into the system.

Have a technician check all the earth points especially the body earth just next to the battery box,this one likes to come loose and brake off.