Help, what is it?

[grant mills]

In my previous query about radio upgrade, I asked about a part that sat on top of the old radio and was connected to an under dash harness (NOT to the radio amp output) I have not heard any explanation for the part. Its base is 4.25" square. There is a trim-able pot. as shown in the first picture and the connector to the under dash harness in the third. The only connection to the old radio itself was a ground wire connected to the rear support strap of the radio. Does anyone have any idea what the purpose is of this simple PCB. What might it control/support?    (Aside: I have installed a "RetroSound" replacement and it fits like a glove in the old opening....I only have to memorise 18 pages of control options/settings)

[grant mills]

Solved (partially)   It is part of the electrical control for the SkyTop power moonroof.  When I put the new radio in, I found that my moonroof was dead. I finally traced it back to the above part. It seems that when I reconnected everything, I failed to fully connect that 7 pin connector. (Big hands, small opening, tight sockets)  When I went back into the dash, I noticed that while the two connectors were joined, they were were only held in place by the friction of the plastic covers, but not seated. Fully seating the plugs restored the moonroof to operational.