89 300e doorlock trouble

[cheesman]

I have a 1989 300E and in the past had intermitant door lock touble. I now have no automatic door locks. There does not seem to be any power to the pump under the back seat. I can follow the power wire only so far without ripping stuff out that I do not want to damage. Can anyone tell me where this pump gets its power from, like where the bus bar or terminal is. Thanks.