Probably connectors. Check front and rear. Maybe a rear was never plugged in correctly and came out (doubtful, but ya never know).

 

Land Rover 3 ambigos solved 100% with proof)


Below the front right foot mate lots of cables are going backwards from the firewall , wity in these cable is a connection with splicers which is broken or rusted that causes initially intermittent and later on permanent break fault ( 3 amigos hdc , suspension , and special program off faults)

here is a link which is not very clear but enough to work on !!


Land Rover 3 ambigos solved 100% with proof)

 

I've just been down the rabbit hole of pulling out the CJB, fixing the sunroof drain line (had to put in a new line from the A-Pillar down) and of course, buttoned it all up. I found this thread on the Disco3 Forum. Super helpful to visualize, for me, the process:

Make sure relays are off the CJB. That'll give you some more room.
Start by laying in the footwell looking up.
Put the box in 90º-ish opened up to the inside of the truck
1 plug red
2 plug green
3 box in position
4 plug-in bigs
5 plug down (green)
6 fixed box

https://www.disco3.co.uk/forum/topic122639-15.html

Once I had this in my mind, it took me about 30 minutes to hook it up and have the CJB mounted. I did take a few test runs.
Now all I need to do is repatch some wiring that has corroded and dry it out. And troubleshoot from there. Yay.

 

Sorry to bring this post back from the dead.
Both? Where is the second one? Lol.
I've got the one behind the vent on the passenger side, but there is another?

 

Driver side. If you pull the lower plastic access panel that has the foot well light you can look up and see it. Far easier to swap than the passenger side. Also there are two more in back. Four drains total but the rears are not usually an issue.

 

Thank you. I am currently parked on the road and have the CJB out looking at it. The Previous Owner had ran new tubing for the passenger drain, but the nipple had plugged up and backed water into the cabin. Got a chronic Parking Brake Failure now, which is why I removed the CJB but there is no sign of corrosion and all the fuses pass continuity. I hit the plugs with some contact cleaner and am waiting on them to dry.

I wonder if maybe the driver side got clogged up, where does it exit at? I don’t have an external vent on the driver side.

 

There are actually 4 drain tubes coming off sunroof tray, two terminating in the front by each fender and two exiting through ody on both sides of C pilars.
In my case all four desintegrated just before exiting through 90 degrees elbows, all at the same time after 20 years in service. You can’t tell if yours are still on one piec as elbows remains in place whereas tube behind is severed from the 90s therefore leaking into the cabin of n multiple places.

 

Thank you. I've got the loom propped up above the channel with an air mover blowing across it in 90 degree weather. I remember when I touched the tip of the passenger front hose it basically broke off in my hand and proceeded to pour water everywhere, the end being completely clogged. Today is my last good day of weather before it starts storming for two weeks as per usual. I haven't had any more water on the carpet since I cleaned out the mentioned drain but I don't know how long this water has been collecting.

 

Also, there is absolutely no need to remove CJB to perform replacement of disintegrated passenger drain tube.There is another way...
Whether you want to replace entire tube assembly or portion of it, this test does not require a labor intensive disassembly of dash panels and CJB.
I took "work smart not hard approach " on this one. Trust me, innitially,I too wanted to remove CJB, but two of the front harness hinge type connectors would not budge. My approach to this problem was to remove A pillar interior trim panel, cut drain tube half way near the dashboard and then snake weed wacker line inside old tube down to and through the elbow leaving a few feet out the air intake area to work with.I then removed old drain line and elbow leaving weed cutter line in place to guide new drain tube through it until it came out on the bottom. It is a lot easier to remove new elbow and reattach it at air intake hole then lightly lubricate the end nipple and gently push in into the hole while pulling on the upper end along inside of A pillar area. Help from another person is needed to complete the task as one has tomato sure that new elbow nipple does not get pulled to far into the cavity behind CJB requiring to start over the process. I actually had to replace the weed wacker line with bicycle brake line as it provides more rigid guide. The whole process takes half a hour and saves difficult prices or removal and reconnecting process of CJB unless someone wants to drop the front of the headliner and replace entire line at the sunroof termination point. In my case, I dropped almost entire headliner as I was replacing all four drain tubes at the same time.They all came apart at the same time, leaking into interior and flooding both driver and passenger footwells.

 

I am fairly certain this is what the previous owner did, there is no elbow, just some clear pvc tubing that is inserted into the black roof drain hose and then ran out side the vehicle, but for some reason had that fitting put on it. I can't see any elbow at all.