Disco 1 Central locking query

I've jus acquired a p reg discovery with working remote central locking and alarm complete with a pair of two button remotes. My s reg has got none of this and the red light on the dash is inoperable, what bits of gubbins do I need to swap over?
Thanks in advance.....

Just the security ECU that's positioned behind the glove box on the left.

discool said:

Just the security ECU that's positioned behind the glove box on the left.

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Great, thanks.

Whether the replacement works in your S reg is something else, there must have been some serious modifications to its system to enable the engine start without the ecu or its fob being present in the vehicle.

discool said:

Whether the replacement works in your S reg is something else, there must have been some serious modifications to its system to enable the engine start without the ecu or its fob being present in the vehicle.

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The central locking has never worked because there's an issue with the n/s rear door and it keeps popping fuses and making a buzzing noise when the fuse is replaced. Not bothered about the alarm or immobiliser working but I'd be nice to have remote central locking

Buzzing sounds like the doorlock motor's little gearbox is seized which will make it blow the fuse.
Had that problem on my previous Range Rover, new door latch fixed it, but you can overhaul the gearbox & motors yourself.

Marmaduke said:

The central locking has never worked because there's an issue with the n/s rear door and it keeps popping fuses and making a buzzing noise when the fuse is replaced. Not bothered about the alarm or immobiliser working but I'd be nice to have remote central locking

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Just isolate the actuator from the circuit buy unplugging it, if the problem goes away u know whats coursing the issue,
There’s not much to go wrong with the actuator other than the motor seizing due to lack of lubricant.
If, after unplugging the actuator you still have an issue then it may be a short in the common loom that serves the other three slave actuators.

DanClarke said:

Buzzing sounds like the doorlock motor's little gearbox is seized which will make it blow the fuse.
Had that problem on my previous Range Rover, new door latch fixed it, but you can overhaul the gearbox & motors yourself.

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Gearbox? Where will we find that in the central locking of a D1?

discool said:

Gearbox? Where will we find that in the central locking of a D1?

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Not sure, as I don't have a D1. As the D1 came after the P38 I have erroneously assumed it has "Superlocking" like the Rangie. There is a mini "geared" box in the superlock mechanism of the Rangie. My assumption was that the same process would probably have been used in a follow-on vehicle. If I am in error, please ignore it and I can only apologise for the mistake.
One of my earlier 1999 Rangie's doorlocks used to buzz and sometimes struggle to open. I took the thing apart and cleaned and lubricated it and it was fine thereafter.

Ok I will, after 20 years with a D1 and prior to that 10 years with a RR which both have the same central locking system I thought I’m missing something.