Audi Cabrio 89: Convertible Top Control Unit Not Responding

Hello everyone,

I bought an Audi Cabrio, model year 1998, with a 2.8-liter engine and automatic transmission a few weeks ago.
The car has an electric convertible top.
This one also works perfectly, however, the warning light for the convertible top occasionally stays on continuously. Then, when you start the engine again, it goes away.

When the ignition is turned on, the lamp blinks 10 times.
It means there are errors in the memory.

Now, let's get to the actual problem:
Tried to read out the control unit (CU) with VCDS (CU 26), but the CU is not responding.
I was able to read the error codes with Autoscan, but I couldn't clear them.

How can that be?
Why does it show up with an automatic scan but not with a manual scan?
Does anyone have any ideas?

Regards,
Nick.

Hi,
Could you please post the Autoscan results here? It would be helpful for brainstorming.
hg
Herbert.

Hello Herbert,

Well, if there's a problem, it's a big one.
Of course, I forgot to save it before the battery died.

I will try again tomorrow.

Regards,
Nick.

Hello,

I updated from version 12.12.2 to version 14.10.1 yesterday evening.
During the initial connection to the vehicle today, a firmware update was offered for the interface, which I also installed.

Okay, let's get started... (Directly via STG26 and using Autoscan).

I'm not entirely sure if the update was actually the cause.
Then one of the old software installations must have a bug.
I'm annoyed that I didn't save it.
I probably tried it about 10 times using STG26, and then, out of desperation, I used the Autoscan.

Here is the complete result:
(Clearing the error memory also went smoothly.)

Quote:

Monday, March 2, 2015, 18:23:04:22892 VCDS Version: RKS 14.10.1 http://shop.dieselschrauber.de Address 26: Electrical Roof System. Label file: DRV\8G0-959-255.lbl Control unit part number: 8G0 959 255 A. Component and/or version: automVerdeck (automatic convertible top). Encoding: Company registration number: VCID: 336E7364016C04B9A35-4B40 3 error codes found: 01096 - Switch 1, left cover for storage compartment (F199) 27-00 - implausible signal. 01111 - Tailgate lock actuator, part 1. 28-10 - Short circuit to positive - Occasional. 01107 - Warning light for convertible top (K98) 36-10 - Interruption - Sporadic.

First of all, thank you for your help and support.
If it happens again, I will let you know.

Regards,
Nick.

Thank you very much for your feedback!