2007 L322 TDV8, Sunroof stuck open, won't close, won't reset

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Hello All!
My first post to the forum so please be gentle…

2007 L322 (Full Fat Range Rover), Diesel V8.

TL;DR version:
Sunroof will open normally but won't close, pressing “close” gives “open a little bit more,” pressing “tilt" does nothing, there is power, and no physical jam. New switch installed. Tried holding to reset, no luck.

Full Version:
The sunroof will open all the way if I hold the switch on “open." Pressing switch to “close" causes the sunroof to lurch OPEN (?!) a bit more, like a stutter step but not continuous movement, and holding “close" does nothing further after this. The "tilt" button doesn’t tilt, in fact no noise from the motor/relay at all when pressing “tilt” except when held down for reset (see below)
No matter what I press on the switch the sunroof opens but will not close. DTC "0X007E - sliding roof switch or connections - defective” is showing.

I’ve tried the following all to no avail:
- Checked fuse, OK (obvs)
- Checked power to switch & motor, full 13V
- Changed switch to a brand new one, same thing is happening on both old and new switches
- Done sunroof reset by holding the “tilt” button until the motor clicks, but then we’re back to the situation above
- Also tried the reset by holding “close,” holding “tilt” releasing and holding again until 2nd click, and basically every variation of holding buttons down till the motor clicks and sunroof should reset, but nothing works.
- Removed the motor and slid the sunroof shut by hand... the worm drive will turn freely as I do this so I know it's not physically stuck.

My only thought is that the ECU in the sunroof motor has gone demented? Is this plausible? Should I just splash out for a new sunroof motor and hope for the best? Any help would be appreciated please…
Many Thanks
 
There should be a manual drive dog you can wind to close it.....this is usually under the interior light panel in the roof....

Take a goosey and see if there is a place for a flat blade screwdriver or similar to wind the motor by hand.
 
There should be a manual drive dog you can wind to close it.....this is usually under the interior light panel in the roof....

Take a goosey and see if there is a place for a flat blade screwdriver or similar to wind the motor by hand.

There is indeed a slot for an allen key in there for winding it shut... which (annoyingly) is stripped. But I have managed to slide it closed by pulling the actual glass forward by hand. Bit of gaffer tape over the top and at least I'm leak-free for the time being!

Really what I'm trying to figure out is why the ECU and motor are behaving so strangely, any thoughts on the latter half of my post? I seem to remember reading somewhere that there is a sunroof ECU as part of/attached to the sunroof motor (?) I may just replace this part as they're only about £30 on eBay...

Do you know if there's anything else electrics-wise that might be causing sunroof drama? Something in the BCU under the passenger seat perhaps? I'm fairly sure all the sunroof-related bits are behind the interior light in the headlining but I have limited experience with the RR...

Thanks for the quick reply!
 
I'm experiencing a similar problem with my RR, were you ever able to figure out the issue and fix it? what steps did you have to take?
 
Just throwing it out there... Have you tried leaving your windows open a crack, then pressing and holding the lock button on the key fob (total closure)?

If total closure is working, the windows will go up (that's why you have them open a crack - to prove it works), and the sunroof may (or may not) close at the same time.

I'm not entirely sure what this would prove if the sunroof does close when using total closure, though it would rule out mechanical failure.
 
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