Wrong sensor voltage can be caused by a wiring fault between the sensor and the roof controller.
This isn't the simple type of fault to learn on this car. Stepping through the cycle you refer to is for trained V.W engineers and if you aren't one, there is a 90% chance you will destroy an EOS roof. It's something I need to take up with Ross-Tech, although I understand they 'Replicate' what the V.W proprietary diagnostics does (badly).
Here's how you can destroy an EOS roof with vcds more than it already is:
The vcds step through option requires a service passcode to start it which Ross-Tech are helpful to provide. You also need the sequence codes and I'm not posting them here for nerds to destroy their EOS roof.
The engineer access can individually start and complete each of the sequences the roof takes to open and close IN ANY (OR WRONG!) ORDER. However, there is no sensor feedback to stop the roof action if something is wrong (which there always is) or you committed a sequence start when other roof parts were not in their correct position for that sequence stage to execute and end up with a crunched mess. This 'dangerous to life and car' engineering function starts a sequence which won't stop until its preset timer stops it (A long time!). There's no emergency sequence stop button once it starts and because the roof pump system is always on power, turning off the ignition won't stop it either.
For example: You roll back the sunroof to fully open Stage 1 but you didn't notice the rear windows were fully raised, or there's a mechanical jam fault You then tell the engineering funtion to commit stage 2 or 3 to lower the roof, THEN CRUNCH it hits the open rear window (or jam) and will continue crunching for a long time until the software times itself out.
With normal automatic system control using the roof switch, you can release the switch and the roof will stop and hold for a couple of minutes. This allows you to inch the roof cautiously in either direction and control when and where it stops. The engineering function is a one stop trigger and you can't stop it once it starts running on its own software timer. The roof pump has a hydraulic overload bypass but that's there to protect the pump and not stop it crunching into a jammed or obstructed roof.
Avoid using the vcds enginneering sequence function. If you are experienced and have no choice, fit a normally closed 80A power relay in series with the pump power feed to use as an emergency stop.
With difficulty and a lot of patience, search here for answers and go fishing through the drop down ski panel.
This isn't the simple type of fault to learn on this car. Stepping through the cycle you refer to is for trained V.W engineers and if you aren't one, there is a 90% chance you will destroy an EOS roof. It's something I need to take up with Ross-Tech, although I understand they 'Replicate' what the V.W proprietary diagnostics does (badly).
Here's how you can destroy an EOS roof with vcds more than it already is:
The vcds step through option requires a service passcode to start it which Ross-Tech are helpful to provide. You also need the sequence codes and I'm not posting them here for nerds to destroy their EOS roof.
The engineer access can individually start and complete each of the sequences the roof takes to open and close IN ANY (OR WRONG!) ORDER. However, there is no sensor feedback to stop the roof action if something is wrong (which there always is) or you committed a sequence start when other roof parts were not in their correct position for that sequence stage to execute and end up with a crunched mess. This 'dangerous to life and car' engineering function starts a sequence which won't stop until its preset timer stops it (A long time!). There's no emergency sequence stop button once it starts and because the roof pump system is always on power, turning off the ignition won't stop it either.
For example: You roll back the sunroof to fully open Stage 1 but you didn't notice the rear windows were fully raised, or there's a mechanical jam fault You then tell the engineering funtion to commit stage 2 or 3 to lower the roof, THEN CRUNCH it hits the open rear window (or jam) and will continue crunching for a long time until the software times itself out.
With normal automatic system control using the roof switch, you can release the switch and the roof will stop and hold for a couple of minutes. This allows you to inch the roof cautiously in either direction and control when and where it stops. The engineering function is a one stop trigger and you can't stop it once it starts running on its own software timer. The roof pump has a hydraulic overload bypass but that's there to protect the pump and not stop it crunching into a jammed or obstructed roof.
Avoid using the vcds enginneering sequence function. If you are experienced and have no choice, fit a normally closed 80A power relay in series with the pump power feed to use as an emergency stop.
