Hi, I left the vehicle outside for a couple of weeks unused (there had been a bit of rain and it does leak slightly although I've sealed it up as much as possible), when I came to use it, I pressed the remote and only the drivers door unlocked. All other doors remain locked (the interior locking switch on the dash has never worked so that doesn't help). trying to open the doors with the internal handles (two pulls) doesn't work so effectively they cant now be opened, using the key in the door lock has the same effect (I've tried pressing the inertia sensor which is working because the indicators start flashing but no door unlocking occurs). I've tried pressing the remote twice quickly in case its a superlock issue and that has no effect either and same for the single point entry function. Listening to the passenger doors when I use the remote I can hear them being actuated when I press the fob to lock the vehicle but there is no sound coming from them when I press to open. I've recently replaced the rear cargo door mechanism and that's not working either so its unlilely to be failure of all 4 door mechanisms at the same time. So logic indicates that they aren't getting power to them to unlock and I see in the electrical manual that there are separate 12V supplies, one to the drivers door only, the other to the rest, although they all seem to be connected to the one 25A fuse. I've been checking a few threads on this forum and others and I'm thinking that water has got into the back of the fusebox inside the vehicle which has corroded the PCB (another minor issue is rear wiper not working but thats been a long term problem). Just want to check with others of they can think of anything else i should check before I purchase a new fuse box? Grateful for any advice.

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I think you are just about to get a reply from the really knowledgable person about electronics on here, at least for Discovery 2s.

An update on my post. I ended up biting the bullet and purchased a second hand fusebox/IDM(?), got it all fitted last night with a bit of swearing and the central locking is now working perfectly. Still no rear wipers and rear window heater but I think i know what the problem is there, another connector which is prone to corrosion.

The Reluctant Mechanic said:

An update on my post. I ended up biting the bullet and purchased a second hand fusebox/IDM(?), got it all fitted last night with a bit of swearing and the central locking is now working perfectly. Still no rear wipers and rear window heater but I think i know what the problem is there, another connector which is prone to corrosion.

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Good to hear this!

Stanleysteamer said:

Good to hear this!

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It looked like there had been a bit of moisture in the area, the exposed steel body work under the steering wheel had corrosion on it so I'm guessing its had some rain water leaking over the years and condensation has got onto the PCB and slowly stuffed it.

The Reluctant Mechanic said:

It looked like there had been a bit of moisture in the area, the exposed steel body work under the steering wheel had corrosion on it so I'm guessing its had some rain water leaking over the years and condensation has got onto the PCB and slowly stuffed it.

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I understand this is quite a common occurence.