Megane II CC Wiring Major Issue - Replacing Junction Box - C

[Alec]

Hey Guys,

So the back-story, a couple of months ago I was reversing down a slipway to launch a boat, due to some 'unforeseen complications' (a rope I'd stupidly put somewhere holding the boat on the trailer and forgotten about!) I ended up taking the car for a bit of a 'paddle' in the sea. It didn't like it. After emptying the boot of water, and leaving the carpets out to dry, unfortunately the damage was more than just the smell, the electrics were royally screwed. We're talking hazard lights on when they fancy, rear windows not working, the car would lock or unlock as and when it wanted, the roof wouldn't open, all kinds of warning lights on the dash, and so the list went on.

Anyway, after working with my mechanic friend, we found the source of the issue. Under the passenger seat carpet there are two junction boxes, sat nicely in a sort of 'tray.' This tray was still full of salt water, and had done an excellent job of corroding all the connections. Here's how it looked:



So I stripped out the junction boxes and connected the wires using solder & heat shrink, however there are 2 wires left over. The connections so far have solved the majority of the issues including rear lights, locking devices and so on. But the rear windows and the roof opening system are not solved. Clearly these two wires are important and should be connected to other wires somehow, but I have no idea which!

I recently purchased Dialogys, however I'm having issues with it connecting to the world vehicle database / registering the VIN, and even if / when I get into it I expect it to be very challenging to locate what I'm looking for in the sea of information it holds.

I'm really hoping someone can help me out here, maybe it's a wiring diagram I'm looking for, for this single junction box, or some expert knowledge. Any help is much appreciated!

Many Thanks,

Alec

[AlexB]

The wiring diagrams are pointed at in the sticky thread (you still need to use google to locate them).

I am afraid this car will keep throwing nasty surprises at you. You should have washed all electronics and everything else with plenty of fresh water from a garden hose within an hour from the incident. It will be difficult to use Clip because of multiple failures masking each other. In this situation you might need to wash off any residue of salt from everywhere (including the bodywork with all its cavities), dry it off, then go around fixing the visible damage. All connectors need to be inspected and serviced. Then connect Clip and pray...

[Alec]

The wiring diagrams are pointed at in the sticky thread (you still need to use google to locate them).

I am afraid this car will keep throwing nasty surprises at you. You should have washed all electronics and everything else with plenty of fresh water from a garden hose within an hour from the incident. It will be difficult to use Clip because of multiple failures masking each other. In this situation you might need to wash off any residue of salt from everywhere (including the bodywork with all its cavities), dry it off, then go around fixing the visible damage. All connectors need to be inspected and serviced. Then connect Clip and pray...

Ah that's useful! Thanks for pointing them out, just giving them a go now to see if I can find the relevant information.

Yeah, I would have done if I knew where these connectors were, it's taken me this long to find them! Thanks for the advice mate, much appreciated

[stewgough]

Hi, did you manage to sort this wiring out ?, as I have to do the same job, are the wires colour code like for like across the male and female part of the plug ? And did you do 1 wire at a time ? , thanks

[Alec]

Hi, did you manage to sort this wiring out ?, as I have to do the same job, are the wires colour code like for like across the male and female part of the plug ? And did you do 1 wire at a time ? , thanks

Still not successfully completed it yet. Most of them are colour coded (and were soldered together 1 by 1), however there are some exceptions (and a different number of wires on each side of the plug). So I've ended up buying this plug section of the wiring loop from someone who was breaking a Megan for spares, hopefully I'll be able to use this to identify which wires connect to what!

[stewgough]

ok cheers, I only have to re wire the under seat part , is this the part you had the problem with ? As it looks as though you had to do the back seat part too, thanks

[stewgough]

I have to do the one on the left in your phot, other one is ok

[Alec]

ok cheers, I only have to re wire the under seat part , is this the part you had the problem with ? As it looks as though you had to do the back seat part too, thanks

Yeah, to be honest I've had problems with both of them! As you can see from the image not all the cables match up. I can try and get some pictures of the replacement part I've got when I'm home next (should be next weekend) if this is of any use to you? May be able to assist finding the right connections.

[stewgough]

That woul be great, I am looking at buying replacement plugs but it's finding them in good condition and off the right car , only one I can find is off a 2.0 and mines a 1.6 and I know if I ask them tgey gonna say it will fit regardless !!!

[Alec]

That woul be great, I am looking at buying replacement plugs but it's finding them in good condition and off the right car , only one I can find is off a 2.0 and mines a 1.6 and I know if I ask them tgey gonna say it will fit regardless !!!

Here's a couple of pics of the socket, https://onedrive.live.com/redir?resid=2 ... =folder%2c

Don't think you'll be able to gauge much from these Images though to be honest!

[stewgough]

That woul be great, I am looking at buying replacement plugs but it's finding them in good condition and off the right car , only one I can find is off a 2.0 and mines a 1.6 and I know if I ask them tgey gonna say it will fit regardless !!!

Here's a couple of pics of the socket, https://onedrive.live.com/redir?resid=2 ... =folder%2c

Don't think you'll be able to gauge much from these Images though to be honest!

Yeah , hard to tell , I started to tackle mine last weekend, you were right , there are wires that seem to go nowhere ?? , have found a couple breaking in Coventry so am going to pick one up the weekend , is this piece of loom std on the cc do you know ? .

Thanks , will let you know how I get on.

[Alec]

That woul be great, I am looking at buying replacement plugs but it's finding them in good condition and off the right car , only one I can find is off a 2.0 and mines a 1.6 and I know if I ask them tgey gonna say it will fit regardless !!!

Here's a couple of pics of the socket, https://onedrive.live.com/redir?resid=2 ... =folder%2c

Don't think you'll be able to gauge much from these Images though to be honest!

Yeah , hard to tell , I started to tackle mine last weekend, you were right , there are wires that seem to go nowhere ?? , have found a couple breaking in Coventry so am going to pick one up the weekend , is this piece of loom std on the cc do you know ? .

Thanks , will let you know how I get on.

I think it's the standard CC, but I'm not sure off the top of my head. Do let me know how you get on, think I'll be tackling it in a couple of weeks time!

[stewgough]

Will do, one thing to note , I had my car on clip diagnostics, all stored faults were to do with windows and roof wich all points to this loom ,none of these faults could be cleared , it also stated that the roof had gone into default mode so I think it may have to go back on clip to clear these faults once the loom is replaced to get things working again ?, I may be wrong though and hopefully the roof will be down for the 2/3 days of summer we can expect !!!

[stewgough]

I have now completed the loom re wire - never again !!!,
I took the plugs from an identical car, same year engine size etc , I do however have wires in the new loom that are not in my old loom?, that said the roof now works !!, the only issue I have is that when I operate the roof the windows go all the way down , I can live with this though also one rear window not working so I will replace the regulator and see if that cures it , bring on the summer !!!!

[Dynamiquetwo]

Well done now stay away from any seaside lakes or ponds