Cadillac Repair: relay for headed seat, electrical schematics, test procedures

Question
I bought a used  2000 dts, the headed seats (both side) upper & lower don't work, check everything and i have juice all the way to a box under the seat ( black ) after that nothing works. i don't thing that all the elements will go bad at the same time. The black box (relay) don't haves any numbers or anything that i could find out what's the parts #. could someone out there help me find the part#, dealer won't tell me the part # only that its cost 175.00. thanks

Answer
You can most likely get them from most any auto parts store. However do you want to spend this much money on a GUESS that you are HOPING will fix your problem or would you like to obtain electrical schematics and test procedures to be POSITIVE that these are what is causing your problem ?.

If you are mechanicaly inclined or know of someone who is, You will need a DIGITAL MULTIMETER, Simple electrical schematics, Test procedures and picture locations of the components within the system that is causing you problems of which can't be done on this website which only allows one picture. I do not have a website so you will have to e-mail: onlineautohelp@msn.com in order to obtain the information.