Suggest you folks get the Audi training guide:
The 2010 Audi A5 Cabriolet
Self-Study Program 960193
The cabrio top does not seal up the back end correctly. The curved hoop below the rear window is the "Tension", there small gap between it and the convertible top box lid.
The Auto Roof (J256) has to see the Convertible Top Closed Position Switch (F202) is "operated" before it will hydrolic cylinders that push the tension down firmly onto the convertible top box lid. The F202 data will be found in Advance Measuring Values:
IDE02664-MAS02264,Switch for folding top-Convertible top front closed position switch
The F202 is located on the right side of the frame, maybe 24"-ish from the front edge. It is on a plastic mount that is secured to the frame. The plastic mount can bend/flex so that the F202 is out of alignment and doesn't get "operated" when the leading edge of the top is flat. You may be able to grab the frame in the area of the F202 and push/pull on the top that the switch becomes "operated" and then a helper and flip the power roof switch to close and the rear tension will gets pushed down as it should.
The fix for this may be as simple as using epoxy to help glue the plastic mount that the F202 is on flush with the frame so it can no longer flex out.
ST?ID=77145
Base line readings for top open or closed found here:
http://forums.ross-tech.com/showthread.php?7674-2017-S5-Cabrio-(CTUB-engine)
EDIT July 28, 2020 (that crappy year) - ST?ID=94503
Same B11A0 code. Top is closed up, however the issue seem to be with IDE02664-MAS02263, Switch for folding top - Convertible top open position switch (F171) which should be "not activated" but it keeps flickering over to "operated". Just wanted to drop a quick note since normally the F202 is the cause of the B11A0 fault code, but now we have a documented case of an issue with the F171 causing it. Hope to get feedback from the tech as to why the F171 is glitching.
Feedback... water leak and F171 is at a low point... so a bit "crusty":
The 2010 Audi A5 Cabriolet
Self-Study Program 960193
Address 26: Auto Roof (J256) Labels:| 8F0-959-255.clb
Part No SW: 8F0 959 255 HW: 8F0 959 255
Component: VSG-AUDI-B8 H09 0170
Coding: 030000
Shop #: WSC 02145 785 00200
ASAM Dataset: EV_ElectRoofContr 001007
ROD: EV_ElectRoofContr.rod
VCID: 71E3D33AA01827CE75-8024
1 Fault Found:
0004 - Switch for Convertible Top
B11A0 02 [137] - Signal Failure
The cabrio top does not seal up the back end correctly. The curved hoop below the rear window is the "Tension", there small gap between it and the convertible top box lid.
The Auto Roof (J256) has to see the Convertible Top Closed Position Switch (F202) is "operated" before it will hydrolic cylinders that push the tension down firmly onto the convertible top box lid. The F202 data will be found in Advance Measuring Values:
IDE02664-MAS02264,Switch for folding top-Convertible top front closed position switch
The F202 is located on the right side of the frame, maybe 24"-ish from the front edge. It is on a plastic mount that is secured to the frame. The plastic mount can bend/flex so that the F202 is out of alignment and doesn't get "operated" when the leading edge of the top is flat. You may be able to grab the frame in the area of the F202 and push/pull on the top that the switch becomes "operated" and then a helper and flip the power roof switch to close and the rear tension will gets pushed down as it should.
The fix for this may be as simple as using epoxy to help glue the plastic mount that the F202 is on flush with the frame so it can no longer flex out.
ST?ID=77145
Base line readings for top open or closed found here:
http://forums.ross-tech.com/showthread.php?7674-2017-S5-Cabrio-(CTUB-engine)
EDIT July 28, 2020 (that crappy year) - ST?ID=94503
Same B11A0 code. Top is closed up, however the issue seem to be with IDE02664-MAS02263, Switch for folding top - Convertible top open position switch (F171) which should be "not activated" but it keeps flickering over to "operated". Just wanted to drop a quick note since normally the F202 is the cause of the B11A0 fault code, but now we have a documented case of an issue with the F171 causing it. Hope to get feedback from the tech as to why the F171 is glitching.
Feedback... water leak and F171 is at a low point... so a bit "crusty":

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