[Warning Light] Strange electrical gremlins preventing start PLEASE HELP

[Ionfly333]

Peugeot partner 1.6 hdi 90 06 plate Your 06 Partner is an M59 aka Mk1:
A couple of months ago now, I had a strange anomaly with the wipers that would not turn off.  That problem resolved itself. Which I did find unusual and thought it may rear its ugly head again, of which it has, but much more spectacular this time.

So the other morning I go to unlock my car, oddly it will not unlock, and it is already unlocked. (using key fob) As I open the door, loads of yellow lights come on the dash, including the fuel empty light and three ABS lights I've never seen before.

The car wouldn't start, but after disconnecting the battery for half an hour it did start and all was okay for one day. Week kinds, The alarm to say the seat belt wasn't on kept going off constantly and the wipers wouldn't work again.

The next day I had the same problem but disconnecting the battery had not fixed it.

Load of strange Gremlins in the electrics, such as headlights on wipers won't work. Loads of bizarre lights, odd readings on the odometer, etc. Clearly a big issue somewhere.
From my little knowledge, I've pulled the body control module out and there was some water in it. I cleaned it up with IPA and refitted it. However, I've got the same problem.
I'm wondering if I'm looking in the wrong place and that the water in there was just a red herring, as the boards are gel coated to be fair.

So I'm stuck with a car that won't start and resembles a Christmas tree if you leave the battery plugged in.
Has anybody had anything similar? Any advice or help will be greatly appreciated.
In advance for anybody who helps here.

[Multispacer]

Peugeot partner 1.6 hdi 90 06 plate Your 06 Partner is an M59 aka Mk1:
A couple of months ago now, I had a strange anomaly with the wipers that would not turn off.  That problem resolved itself. Which I did find unusual and thought it may rear its ugly head again, of which it has, but much more spectacular this time.

So the other morning I go to unlock my car, oddly it will not unlock, and it is already unlocked. (using key fob) As I open the door, loads of yellow lights come on the dash, including the fuel empty light and three ABS lights I've never seen before.

The car wouldn't start, but after disconnecting the battery for half an hour it did start and all was okay for one day. Week kinds, The alarm to say the seat belt wasn't on kept going off constantly and the wipers wouldn't work again.

The next day I had the same problem but disconnecting the battery had not fixed it.

Load of strange Gremlins in the electrics, such as headlights on wipers won't work. Loads of bizarre lights, odd readings on the odometer, etc. Clearly a big issue somewhere.
From my little knowledge, I've pulled the body control module out and there was some water in it. I cleaned it up with IPA and refitted it. However, I've got the same problem.
I'm wondering if I'm looking in the wrong place and that the water in there was just a red herring, as the boards are gel coated to be fair.

So I'm stuck with a car that won't start and resembles a Christmas tree if you leave the battery plugged in.
Has anybody had anything similar? Any advice or help will be greatly appreciated.
In advance for anybody who helps here.

What/where is the module you are referring to as the 'Body Control Module' Are you talking about the module inside the vehicle [the BSI?]

If that is what you are referring to and it had water in it, you could have serious problems if that has been water damaged.

Firstly if that is the module you are referring to, you really need to find out how water got onto/into it. The common cause of water ingress into electronics both on the M59 and the later B9 [I've had both] is that the scuttle panel water drains in the corners of the engine bay under the wipers become clogged with debris and leaves and then water cannot drain out and ends up finding it's way into the cabin and all over the various electronics in the engine bay.

I would say the most likely candidate for your long list of problems is the engine bay fuse box [that is adjacent to the battery] as that is not only a fuse box but also has a load of electronic circuitry on the underside that communicates with the BSI and if that gets liquid damage, then it causes a whole load of random problems. In my case, first the rear wash/wipe stopped working, then I started getting a whole load of random warnings. Finally the wipers would randomly start and the headlamps would switch on all with the ignition off and the car shut and locked! 

To see if there is evidence of water damage to that unit. Disconnect the battery [if you have it connected] and wait the required five minutes or so for everything to go into sleep mode, then start going through the engine bay fuse box by pulling out one fuse at a time and looking for any sort of corrosion/liquid damage on the fuse blades or in the connector side that the fuse fits into. Clean each fuse and connector in turn with electrical contact cleaner [do not use any other cleaner such as WD40 on electrics as that can leave a residue that can cause even more problems] After you have checked, cleaned and refitted all the fuses then one at a time, disconnect each of the electrical connectors in this box
and again check for any corrosion on the pins and again clean with electrical contact cleaner and refit. 
After that try reconnecting the battery and see if that helps. Unfortunately if the liquid damage to this unit is too bad then [as in my case] the only option is to replace the whole unit [the fuse box complete with electronics] Luckily as they are used in many PSA group vehicles it is pretty easy to pick up a used unit but make sure if you do go down this road you purchase the EXACT same part number as in your vehicle as there are many different units in PSA group vehicles and although they look the same they are not interchangeable.
It is a DIY job to change [it took me about 20 minutes] and there is no programming/coding required, it is a plug and play unit. My replacement unit was less than £40 delivered from a supplier on the well known auction site and it cured all my random problems.

As I said right at the start though make sure you check the drains, as if they are still blocked, your new unit will suffer the same fate.

[Ionfly333]

Yes, I pulled it out from the driver's side where the obd plugged in.

Thank you so much for your kind advice and help. I will check the engine bay fuse box and report back.

Thank you again