The alarm ECU will have died as it has had no 12v input and the internal battery has carked it. Can happen after about 12 months. The alarm ECU controls the central locking. Once it is dead it is a very dead parrot.
I replaced the alarm ECU (sits just above the drivers knee adjacent to the steering column) with an aftermarket unit and connected the new alarm blinking light output to the Rangie light on the dash (the installer used a new blue light which lit half the street and looked terrible). Has worked well for four years. The unit I installed was this one Car Alarm System | Brant Corporation (I think) but it would pay to check out what else is available now. It operates the central locking just like the original one and picks up alarm inputs just the same (volumetric and perimetric). The only downside is that the driver's door button doesn't lock all the other doors. I could fix this, I just haven't bothered.
I should add that I had mine installed by a local Brant dealer. Was very happy with them and have used them since for other stuff.
2013 D4 expedition equipped
1966 Army workshop trailer
(previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE 3.9V8 then HS2.8)
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