92 400E window & sun roof problems
 

Hello; the windows and sun roof on my 92 400E only work intermittently. I have checked the unit under the driver's side rear seat, and it seems fine. Could the problem be with the convenience control unit? If so, or if not, could anyone please make some troubleshooting suggestions? Also, the rear passenger's side running light stopped working due to no electricity getting to its connection. Currently I have jumped that light off the main tail light, but was wondering if that could be related to the window/sun roof troubles?

Thank you in advance, as I have always previously received great advice, for which I thank you all.

Thos 43