Calling Sunroof Experts - 2004 Disco Sunroof problem with video
 

I have a 2004 Disco, and I can't figure out what's wrong with my front sunroof. The rear sunroof works fine. I've replaced both the switch as well as the motor and I still can't get this thing to work right.

Currently, it moves about an inch, stops, then moves again. See youtube video for reference.

PLEASE HELP!

Now I cannot speak for the Disco II, but the Disco 3 has a reset function built into the sunroof control button. Maybe they had it in the previous model as well?

for the 3 it was hold the close sunroof button down for 30 seconds. Reset procedure starts and the motors try to fully cycle the system with factory settings. IF this is even a thing on the older disco's just let it cycle by itself and try again when it stops.

B-side, I was not even aware the disco had 2 sunroofs! what?! That's some luxury.

Thanks for the tip, I have never heard of a reset on the button for 30 seconds. a search has not yielded any more information. Can anyone comment?

I can't tell if your motor is straining or just stopping and starting... whether it seems like there is a physical problem or an electrical.

Mine acted exactly like that before (motor was not straining... just stopped and started). When I took the switch apart there was rust in it and I found a fault in the seal on my sunroof. I replaced the switch and it worked fine. You might be able to test that by just bypassing the switch but I'm not sure which wires in the connector will do the trick. If in my driveway I would take a piece of wire and try all combinations until it worked or the truck caught on fire... you may want a more conservative approach.

Charlie_V,

It definitely sounds as if the motor is starting and stopping.

Then it has to be the switch or the relay. The sunroof motors don't stop in response to a hand or neck in them--or a least mine don't (tested with hand and neck). So I strongly suspect the switch. I'm sorry but I can't remember whether the switches can be swapped. If they can, try that and I bet you find the problem.

Switch is brand new though. Could it be the Sunroof ECU?

We are instant messaging. I added... can you swap the switches? I don't remember if they swap.

I actually didn't know there was a sunroof ECU unless you mean the BCU... but if you change that you have to also change the ECU or have them matched by a dealer or genius. Unless something else it acting up it probably isn't the BCU.

It is possible that the motor is poorly grounded or has a bad connection, but I really think it is the switch or relay. If you can find the right relay you can swap a matching relay to see if it makes a difference.

There is definitely a sunroof ECU. It even says 'sunroof ecu' right on there. It connects to both the front and rear sunroof. Right behind the switches. I think I'm just going to try and replace that and go from there. Pretty cheap on ebay.

1994 2004 Land Rover Discovery 1 2 Sunroof ECU 1 | eBay

Well I was asleep in class. What's worse is that I picked a rover CLEAN about a month ago (bought I for parts) and I didn't notice that. I'm sure I have one in a bucket somewhere because the truck was bare metal when I was done, but 39 bucks with free shipping is pretty close to free in rover land so I shouldn't have bothered; good find!

Please post whether it works!

Best,

Charlie V

I believe that there is a manual way to open the sunroof with an Allen key. I think its behind the trim where the motor/gearbox is. Pop the trim off and you will see a spot to put the allen key. This should allow you to see if its a mechanical or electrical issue.

I am not a sun roof expert
 

....but I have replaced the front sun roof motor.

"Currently, it moves about an inch, stops, then moves again." Your post. I watched the video. It seems you need to repeatedly hit the switch to move the roof an inch at a time.

I confirmed that I need only hit the sun roof switch once, and it opens all the way, after the initial "crack open" position. There is a procedure in Rave to index the sun roof motor (essentially, positioning a contact switch in the gear box to the correct spot) when installing a new motor. Did you do this?

Take a look at rhe RAVE manual and the wiring diagrams. My guess is there is a latching and thermal decoupling relay somewhere that's not latching properly (similar to the window motor), pure guess though. The manual will hold the answer no doubt.

I did not do this. What is the procedure?

2004 discovery s
 

Hi! I have a 2004 discovery with the exact same problem! I've indexed the motor, replaced the ECU, tried to reset/recalibrate the system multiple times with no luck. Does anyone have any more suggestions for solving this issue?

Thanks!

Drop the headliner enough and remove the sunroof motor. Make sure the sunroof is completely closed first. Look at the illustration below and make sure the microswitch is lined up properly it could be that simple. I cussed like I was still a sailor trying to figure out why mine only opened partially after I replaced it with one I got from a pull a part that looked new. Took a step back and read the rave and found out that the dial was not in the correct place hence it only opened enough to piss me off. https://cimg1.ibsrv.net/gimg/landrov...1861788696.png

That could be the difference in it opening all the way as it should or only partially.

Since you said it was your front sunroof, just remove the overhead map pocket, the interior sunroof surround and with a 1/4 ratchet drive and the proper torx head, can't remember the exact size off the top of my head, you should be able to remove the sunroof motor and undo the harnessto verify to proper position of the notch and micro switch. It just takes a little patience, holding your mouth correctly and either a makers mark n coke or 2 blue moons (my preferences). After adjusting the cam on the sunroof motor by using the Allen wrench (4mm if I recall correctly) you can test it whit the headliner still handing down. If it still doesn't work, the same torx bit undoes the 3 screws the mate the motor to the assembly and you can undo them and see if there is rust or water in the magnent and winding side

Passenger footwell has a red wire 2 to 1 splice. That splice effects the sunroof and seats.

https://cimg7.ibsrv.net/gimg/landrov...1fa14a4f9.jpeg

wrong thread, sorry it's for LR3.

Not mine, but seemed interesting: