Downhiller wrote:

For anyone, like me, who is nervous about removing the apparently tightly fitted and hard to access Central Junction Box (CJB) to get behind it so that you can push a replacement sunroof drain tube through the inner wing, I've found the guidance on this forum to be brilliant. However, some knowledge is sometimes assumed. It took me ages to work out how the Central Junction Box (CJB) came out.

Obviously, to get at it you need to take out the glove box lid. After dropping the lid Its only held in with 2 plastic hinges. The pegs through the hinges need to be tapped out and replaced ( they break when they come out). I found a right angled pair of small pliers particularly useful to do this.

There are only 2 easily accessible nuts (10mm) that need to be undone to remove the CJB. They are at the bottom of the CJB. The top is held in with pegs that protrude from the top of the CJB.

Once the CJB drops, you need to disconnect 6 multi plugs. You absolutely cannot get into the area where the tube is going to go without doing this. Not unless you are Darth Vader or Yoda. 3 are on the front, 2 are on the back and one is on the bottom. Again it took me yonks to work out how these multi plugs came out. Land Rover have learned their lessons of the passed and have made the multi plugs in the D3 bomb proof! The front ones on the CJB are held on with those black plastic hinge type clamps. Don't spend ages simply pulling at these.... like I did. Look at where the hing is and simply unhinge them. This assists with the unclamping and sliding movement. Might seem obvious to some but it wasnt to me. remove the bottom blue one first as it is the easiest to access and you'll see how they work. The rear ones are of a similar design but much smaller. Put your hand behind the CJB and you will feel 2 multi plugs held in with plastic hinged clamps. They come out very easily.

Once you've disconnected everything it drops out. The sunroof drain pipe hole in the inner wing is just behind where the CJB was and about half way down the footprint that the CJB would have filled if it had been there. Scary to think that so much water has been coming through this and right next to the main CJB and all those multi plugs. After doing the new drain tube (thats the easy bit!!!) putting the CJB back in is easy if you remember that the multi plugs are colour coded with the red plugs to (Port) - right and green plugs to (starboard) - left. They obviously knew there was going to be a lot of water in there at some point!!! The bottom one is even blue as it is closest to your soaking wet carpet! Maybe an in-house Land Rover joke they played there or maybe an engineer knew the sunroof drain tube was a crap design but none would listen to him so he applied a nautical colour coding system for the electrics!

The new drain tube is a much more solid design and i highly recommend replacing them. The problems with mine started when i trimmed the end of the tube as per recommendations from others to unblock the end. This obviously began a perishing process which eventually caused it to fail.