problem with remote key fob, immobiliser, alarm and central locking systems

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cyclopath

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Vehicle: Land Rover Discovery tdi 2 (1995 model) with spider & 2 button key fob.

NB Central locking does NOT work using the key as it won't operate in the lock in the driver's door. Until yesterday the central locking used to work with the remote fob. Should I be able to operate the central locking using the key instead of the fob - if so, how can I get it to work properly?:doh:

Description of fault & troubleshooting I have tried so far:

1) Yesterday evening I had a problem with remote key fob, immobiliser, alarm and central locking systems after a day of steady rain. :doh:The car was unlocked outside my house (v rural here) as usual & I keep the key in the house.

2) When I tried to start the car, the starting motor did not turn over - no power was coming thru from the battery. I suspected a flat battery or immobiliser immediately. Battery was 12.4 V & I also tried to jump start from a spare battery - problem(s) still persisted.

3) I then tried the lock & unlock buttons on the fob - the locks did not react at all, even after replacing the fob battery, and indicator lights do NOT flash at all.

4) Disconnected negative lead from car battery for a few seconds. Alarm siren pipped twice & then stopped. Tried to start engine & operate remote fob - all operations failed.

5) Disconnected negative lead from car battery for a few minutes. Alarm siren pipped twice & then stopped. Tried to start engine & operate remote fob - all operations failed. Tried locking driver's door using door button - it only locked driver's door (it should lock all doors, so I suspect a problem with the central locking unit - where???

6) Disconnected negative lead from car battery overnight. Alarm siren pipped twice & then stopped. After reconnecting battery next day I tried to remote fob to lock & unlock doors - all operations failed & no indicator lights flashed.

7) I left key in ignition in the start position, & with driver's door open, I pressed the lock button on the fob several times. Turned key back to off position & the alarm pipped several times. The alarm also went off every time I opened the driver's door. However, I managed to start the engine & keep it running for several minutes, so I have overcome the immobiliser problem :):D

8) Disconnected battery again for a few minutes, shut driver's door and reconnected battery. Alarm doesn't go off when I open the door now. However, remote fob and central locking still don't work.

Does anyone know the correct procedure for resetting:
- alarm
- immobiliser
_ central locking system
& how these systems interact with each other?

All help very gratefully appreciated.

Emyr

 
The security system must be well confused if the power being removed so many times.

Starting with the fob and assuming it isn't faulty should have a good quality battery fitted, to resync the fob to the system press the lock button a lease 4 times and you will find the central locking system will lock/unlock. Fobs can go faulty and loose their tuning but can be refurbed. Key Fob Reconditioning

To remobilise the engine the fob should be near the ignition switch and will unless you have a problem with the immobiliser 'spider' and if there is, the spider can be bypassed.

The central locking via the drivers door lock is controlled by the master actuator within the door, it may only require some adjustment on its screw mountings or it may be faulty and require replacing.

You will find more info if you do a search.

And :welcome2: to the Forum
 
Last edited:
Thanks for reply.

I re-soldered 2 dry joints on the spider last year when it was cutting off the fuel solenoid sporadically. Fuel solenoid (& spider) has worked fine ever since.

Is it possible (& common) for a faulty spider to affect immobiliser, central locking unit, alarm and key fob simultaneously?

Everything was working fine the last time I used the vehicle, & after 3 days of rest nothing worked. The indicator lights don't even flash when I press the key fob.

I'm still researching the faults - takes more time on a dial up connection.
 
Still have immobiliser, C/L, alarm problems. Car won't turn over, alarm screeches whenever I reconnect battery - can only silence it by pulling alarm fuse.

Does anyone know where I gen get a wiring &/or logic diagram for the Discovery 3 (1995) security / alarm / immobiliser systems - I have wiring diagram in Haynes Manual only for central locking system. Web link or other contact info would very much be appreciated.
 
I had and continue to have a problem like yours. I would look at the alarm unit under the glove box and see if any water has got in it.
 
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