td5 keys / key fobs

[sotal]

My father in law has 2 keys for his td5 discovery (1999)

The first key works fully for the car. The second key doesn't. They have always been like this since he got the vehicle about 5 or 6 years ago.

The second key fits the locks etc but the remote doesn't work - the light doesn't even light up even with a new battery. The circuit board looks like it has been wet at some point.

The key also won't start the disco so isn't deactivating the immobiliser.

How does the immobiliser work on these? I expected that if you unlocked the disco with the working fob that the dead key would still start the engine?

What would be required to get the key working again?

[landroversforever]

Having overheard a convo in a local LR place... Disco 2 remotes need the battery changing before they die. as if they are left to run down you need a new remote not just a battery!

[sierrafery]

if the second key is dead from some reason(maybe interrupted circuit within) then the passive remobilisation coil doesnt comunicate with it:

"The passive remobilisation exciter coil consists of a coil around the steering column lock. The coil energises to create a magnetic field when the ignition is switched to position II.This coil activates the handset initiating the mobilisation of the vehicle. (RAVE)"

so the fob must be fully functional to start the car...unless u deactivatte the passive immobilisation...it's a setting in the BCU configurable with tester,( nanocom, hawkeye,etc)

[teabag]

As the Count above states your keyfob must be full functional to remobilise the engine and if it's been in water forget it, remove the blade and throw the rest a way and get a new one.