2) Now I have a "Retractable Roof Visit Workshop" error message. Is it really broken, or is there a "reset" I can do? (I have the smart-top module)
A. Try to deactivate the SmartTop module:
Enter programming mode: doors unlocked, key out of ignition. Insert key into ignition but do not turn. Press and hold the upper MENU button on the steering wheel(the one w/ double rectangular icon) until L indicator lamp blinks once (this indicates function 1). Let go of button and navigate using the the up and down buttons (to get into specific function nos.). In version 1 of SmartTop module: Function 1 - product enable, 0 = OFF, 1= OFF. Use the + and - buttons to change the setting within each function. You will know you're in function 1 because the L turn indicator flashes once. If the R indicator flashes once after the L one flashes, then the product is enabled. press the - button, the L turn signal will flash once and the R signal lamp will not flash after the left one, indicating the product is now deactivated.
Key not in ignition, doors unlocked, COMAND is off. Insert key and turn to accessory position (position 1),select audio screen using the MENU button on steering wheel. Press and hold phone hang-up button on sterring wheel until the L turn signal blinks once to indicate function 1. Let go of button. Navigate thru functions using up and down buttons. change setting within each function using the +/- buttons. Function 1 - product enable/disable 0=off, 1=on. (works very similar to version 1).
Once the smartTop module is in OFF mode, the warning about the roof should disappear. The warning may have come on because of the inadvertent loss of battery function. If the warning disappears after inactiviating the SmartTop module, wait a few minutes after removing the key from ignition. Re-enter programming mode and activate the roof module. Hopefully the warning on the roof does not return and module will now work as normal.
B. If the above doesn't work, that means removing the power source to the roof module and reconnecting, this may reset the roof module. Some disassembly may be required to get to the roof module's power source.
C. If the above 2 maneuvers don't work, then the next step is to remove the connections from the roof module to the CANBUS, reconnect the original CANBUS connectors. Check to see if the roof warning disappears and it should on this manuever (as the roof module is no longer in the picture). Reconnect roof module as if installing for the first time when the warning disappears and the roof module should work.
Hope the above helps.