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Thanks Jig Rig --- This is the type of techinical info the man needed. My wife has heated seats in her Masda SUV. The owners Manual doesnt give a breakdown this specific. She has two switches in the center of the dash that is pressed one time and turns on the backrest and bottom at the same time. As the seat warms the heat reduces to lower levels automaticly. These high tech computer controled modules, almost have replaced relays and can be anywhere in the vehicle and if you found it you wouldnt even know what you are looking at..... As you mentioned the Ground circuits can even be controlled by computers which can be enough to run a technican batty ---- That is why these analizers the Dealers use penpoint things for Mechanics -- A couple of years ago I had a small Import Truck supplied by my Employer that the headlight went out. When I replaced the light it still did not work. In the Fuse box there was a fuse for each headlight that were good. In the fuse Box were several plug in relays one was for Rear window defroster that the truck did not have. Swaping that relay fixed the headlight. Like the man said --- I didnt know it could get so envolved ---- I Kind of got left behind, as the Technology keeps getting tougher