I'm working from memory, but it may have been the switch that is hidden behind one of the interior panels near the back set.

If you search my posts, you may find information on how to read codes for the top using a homemade code reader. The electrical ports to plug in the code reader is in the passenger side footwell.

The code reader itself is easy to build using a momentary switch and LED light. I used an old 35mm film canister to hold everything together. The plans to build it and how to use it are also somewhere in these threads. This is the same code reader used for reading codes from the engine.

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95 E320 Cabriolet, 169K