You can read the fault codes for your top. You use the same code reader that you should have for the Pin 8 and Pin 14 engine diagnostics.
The code reader will need to be connected to Socket 2 of the 4-socket connector (X11/12) Power Soft top test connection. The connection is located at the right front passenger footwell. From the inside, it's under the carpet against the firewall and under the steel panel. To avoid the need for an extension cable, connect the black lead of code scanner to any good ground and red lead to a battery + source inside vehicle."
You may want to take a look at this thread:
http://www.peachparts.com/shopforum/tech-help/107630-e320-16-pin-dtc-charts-inc-pin-8-pin-14-a.html