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Discussion Starter · #1 ·
Hi everyone,



me again!

so after having my car with a VW mechanic for 4 months he wasn’t able to do anything with the car …

And seeing as all roof specialists are in UK and not Ireland I wont be able to get there anytime soon due to travel restrictions etc…



So the car has error 02805…

when the roof button is pressed, the sunroof goes back and stops half way, and as can be seen in a video I took of the live binary of the roof, the locks for the c segment unlock then re lock when the error occurs on screen..



There’s list of things that I can tick off that isn’t the problem..

the solenoids are not the issue because in basic settings they work fine in opening the roof in correct order.



The 12 hall sensors also read the correct roof position in each stage when checked in basic settings..



the midi fuse also has been replaced.



The windows have been reset also.





it has 0 issues opening in basic settings in VCDS but will not open by the button AND even tho it senses an issue BUT WONT TELL ME WHAT IT IS..OH THE JOYS OF THIS CAR!



a different VW mechanic also had it for a month before xmas and done F$$$ ALL with it and tried to tell me there were certain sensors not working that didn’t even exist in the car!!!



I’ve opened it with basic settings and used WD40 to oil up any moving parts etc just incase the computer was picking up a friction issue or something and that didn’t do anything.



ANY ideas on what to try next ? motor seems fine, hall sensors seem fine, windows seem fine…



PLEASE give me any ideas on things I could try next…



Thanks to all x
 

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Confirm the V.W Stealership technicians who have been working on your car are V.W EOS roof trained. You cannot asssume anything works or is fine, unless you know how it works and can prove it, other than looking at a computer screen and believing what you see.

Confirm on manual switches with the engine running:
1. The sunroof opens and closes correctly without sticking, slowness, or hesitation.
2. The windows can be lowered individually from the driver buttons AND they all go up/down on the ALL windows down switch. Each pair of windows should go down and up in about the same time, with no stalling or hesitation.
3. Confirm One touch windows works: You hold a window button for a second and it goes right down, same with the right up.
Repeat the key in lock windows calibration procedure and confirm:
a. Key fully one way and hold 10 seconds, all windows AND sunroof open.
b. Key fully opposite way and hold 10 seconds, all windows go up and sunroof closes.
4. Confirm the trunk locking and pulldown are working. Trunk locks/unlocks from the remote and you can hear the pulldown motor operating. Confirm for the trunk release on the drivers door.
5 Clear any fault codes, turn off ignition, turn back on, rescan and confirm there are no fault codes.
 

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Discussion Starter · #3 ·
Confirm the V.W Stealership technicians who have been working on your car are V.W EOS roof trained. You cannot asssume anything works or is fine, unless you know how it works and can prove it, other than looking at a computer screen and believing what you see.

Confirm on manual switches with the engine running:
1. The sunroof opens and closes correctly without sticking, slowness, or hesitation.
2. The windows can be lowered individually from the driver buttons AND they all go up/down on the ALL windows down switch. Each pair of windows should go down and up in about the same time, with no stalling or hesitation.
3. Confirm One touch windows works: You hold a window button for a second and it goes right down, same with the right up.
Repeat the key in lock windows calibration procedure and confirm:
a. Key fully one way and hold 10 seconds, all windows AND sunroof open.
b. Key fully opposite way and hold 10 seconds, all windows go up and sunroof closes.
4. Confirm the trunk locking and pulldown are working. Trunk locks/unlocks from the remote and you can hear the pulldown motor operating. Confirm for the trunk release on the drivers door.
5 Clear any fault codes, turn off ignition, turn back on, rescan and confirm there are no fault codes.
Hi Voxmagna, thanks for getting back to me so quick. Yes, the VW mechanics who took the car both claimed they were trained, but I think they were hoping it be an easy fix (ie pump/Motor replacement)
I can confirm that everything you listed works..
Thanks again for helping.
 

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You have to be 100% accurate with all those details otherwise next steps can be a waste of time? If as you say everything is exactly as I said, no ifs or maybes, then your problems occur when the roof controller is running the sequence? It basically issues a set of commands equivalent to the manual commands, but in a step sequence whilst checking sensors as the parts move in the time allowed for each step.

You said the sunroof only moves half way? Can you confirm that's only when the roof operation tries to do it and what happens next, does the roof operation stop (on error) and go no further? Will the sunroof move back on the roof switch to close the sunroof from that point and finish in the roof fully closed starting position?
 

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Discussion Starter · #5 ·
You have to be 100% accurate with all those details otherwise next steps can be a waste of time? If as you say everything is exactly as I said, no ifs or maybes, then your problems occur when the roof controller is running the sequence? It basically issues a set of commands equivalent to the manual commands, but in a step sequence whilst checking sensors as the parts move in the time allowed for each step.

You said the sunroof only moves half way? Can you confirm that's only when the roof operation tries to do it and what happens next, does the roof operation stop (on error) and go no further? Will the sunroof move back on the roof switch to close the sunroof from that point and finish in the roof fully closed starting position?
yes 100% everything you listed works, yes so the sun roof opens and closes no problem when sunroof button is used, it only stop half way when being used from the full roof button. the sunroof opens half way, the c segment locks unlock and the boot unlocks then when the sun roof stops half way and the error appears, the c segment locks re lock by themselves and thats that. Thanks again in advance 😊
 

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I'm surprised the boot unlocks at this early stageI found it doesnt do it until the rear window is almost at the top /last part of it's movement. I presume the sunroof motor is the correct one. Also, did it ever work whilst in your onwership?
 

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yes 100% everything you listed works
Not quite, you must reply to everything I asked, otherwise it's a waste of time. I'm not looking at what's happening!

I asked if the roof op. aborted at the sunroof half open stage and whether you could use the roof switch to go back in reverse? You seem to be saying it carries on, then things go wrong? What I'd like to know is the stage in the roof op. where you can go back on the roof switch and the point where you have no control and the roof switch does nothing, it should be easy to confirm that?

the c segment locks unlock and the boot unlocks then when the sun roof stops half way and the error appears,
That confuses me too but the center lid lock with its pull down motor and the corner C claws are two different things. When the roof has to move parts, ALL segment locks are opened just before and the trunk locks (I mean the corner C claws) are always closed. They stay closed throughout the roof operation until the end, which is why people get 'trunk lock out' and can't open the lid if the roof cycle aborts and fails to complete. When your roof fails mid cycle, check through the ski hatch, because the lid C claws should be wrapped over the lid corner hoops in readiness to move the top member away from the 'A' pillars. That stage is just past the sunroof roll back to extended open. Have you ever seen the sunroof get to the extended open? Have you ever had the roof working before or did you buy the car like this?

If you reverse the roof operation as I've asked questions about, it should but not always be possible for the roof and sunroof to roll back closed and windows come back up, ALL segment locks should then be on and the trunk lid C claws should be open.
 

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yes 100% everything you listed works, yes so the sun roof opens and closes no problem when sunroof button is used, it only stop half way when being used from the full roof button. the sunroof opens half way, the c segment locks unlock and the boot unlocks then when the sun roof stops half way and the error appears, the c segment locks re lock by themselves and thats that. Thanks again in advance 😊
The sunroof only opens (ie opens by sliding back, ie after its tilted open) "half" way when used with the sunroof button; but when 'full' roof (ie convertible) operation is done, it should open fully. If yours doesn't do this, then that's the problem.
 

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I'm surprised the boot unlocks at this early stageI found it doesnt do it until the rear window is almost at the top /last part of it's movement. I presume the sunroof motor is the correct one. Also, did it ever work whilst in your onwership?
I have never had a 2nd person check mine, so I can't be 100% - I've never heard the boot unlatch or the pull-down motor go up, over the other noises of the convertible top. But obviously the boot unlatches before the bootlid goes backwards. I think its well beforehand, ie it unlatches before the rear screen flips up but it doesn't move the lid until after the rear screen is fully up.
 

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If yours doesn't do this, then that's the problem.
But what's the problem and how does he fix it?

Stay on track with post #7 unless there are other solutions, better ideas or you want to get lost in the jungle! I know about sunroofs, motors and controllers as I've had mine out, hanging on wires and done things many others haven't, which is why dealer tech's cannot always find solutions.
 

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Discussion Starter · #11 ·
@paul_c @voxmagna I recorded a video that might better explain whats going on, thank you all by the way for getting involved and trying to help me
https://youtu.be/7VzCEGPnpnk

also this was a video I had taken of the binary when in action, the binary stops exactly where the roof stops in the binary above

Thanks all!
 

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Check Ross-Tech’s video - sensors 6 and 7 do seem to momentarily change from 1 to 0 and back again in their video too.
 
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Please note there is another closed thread on this topic which contains additional posts on this problem which may be accessed using the following link:

Error 02805 (my last hope)

My apologies for not combining these into one as it cannot be done without destroying the continuity of both threads. This is why duplicate threads are a real PITA for both Moderators/Administrators plus annoying for members who have to juggle between both threads as will be the case here. I closed the duplicate thread when it first appeared but it appears to have been reactivated for some unknown to me reason.

silvershadow - Moderator
 

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I assumed there could be more than more fault? Taking simple steps, the sunroof coming right back further than it does normally, happens at the first stage before anything else and there will be no indication on the sensor scan because there are no external sensors for the sunroof. Once you get that doing what it should, move on to sensors? Have you done a visual inspection of the roof controller and its connectors looking for damaged wiring or connector pins?

The central rear lid lock pull down should rise and the lid lock opens AFTER the rear window frame has been lifted on top of the center roof section and just before the rear parcel shelf with trunk lid attached and side flaps swing out. This is about 15 seconds from pressing the roof op. start switch. If trunk lock activity occurs before these parts are in position, then either the controller is faulty, or there's a possibility of wiring shorts or bad grounds causing the correct sensor voltage to pair with another sensor which should only be active at a later stage. The roof wiring loom has some nasty open common splice joins in it. But perhaps you and everybody else working on your car are seeing things that don't make logical sense and are looking for simple solutions, when methodical fault finding is required?

Has the roof ever worked and have any parts e.g the roof controller, sunroof motor or trunk locking parts been 'repaired' or replaced? It's helpful for us to know if your car has been a 'Can of worms' from the start, or is now in such a state that multiple and complex faults can't be found without a strict methodical approach to fault finding and going over every part that could have been interfered with? You won't get that kind of help in a simple basic format from diagnostics, the shop manual or guided fault finding - which is why garage techs can't fix it and give up.
 
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