Car Mechanics (UK)
The key-fob has stopped working for my 2002 Jaguar S-TYPE. It had been working fine beforehand and didn’t show any signs that the battery was going flat. I replaced the battery with a decent brand, but it still doesn’t work.
Can these key-fobs be reprogrammed easily? Opinions differ at the online Jaguar forums, with some suggesting it’s a main dealer job.
From the data I have, the key can only be programmed using diagnostic equipment. It also notes that, while changing the battery in the key-fob, the buttons should not be depressed. Having said that, in the past I have recommended trying a couple of different methods which have worked and would be worth attempting.
The first method is: 1) Sit in the vehicle and turn the ignition from off to on (position II) four times.
A chime should be heard. 2) Press the lock button on the remote (and any further remotes for the vehicle), then switch off the ignition. Test the operation. If this is not successful, the second method is slightly longer and I would recommend leaving the vehicle for a short time between attempts. 1) Open the driver’s door and the boot, sit in the vehicle and pull the main beam switch towards you. While doing this, insert the ignition key and turn it to the ‘accessory’ position, then release the main beam switch. 2) Pull and release the main beam switch four times – do not flash the lights as
such, but do this slowly. After doing this you should hear a chime. 3) Press the ‘lock’ button on the remote. If you have more than one key, all
remotes will need to be pressed in sequence. Another chime should be heard. 4) Close and open the driver’s door, then close the door and test the remote.
These methods are not guaranteed, but they do access hidden menus in the control module and have been used with success in the past.
As the remote central locking stopped suddenly and with no warning or reduced range before the failure, the problem may not be the key but the remote-control module located in the driver’s door. If this is the case, the power supply to the module or the module itself may be at fault. I would first check the wiring between the door and A-post – a broken wire here could cause your problems, as could a bad connection within the door.
Finally, there is a small Sealey device which most auto locksmiths should have which will ensure that the key is giving out a remote signal. This unit is available at Machine Mart for £36: https://bit.ly/2okbpwc