Could be? Do they both have to be in for both seats to heat?? Neither did , but I haven't tried them since I replaced the fuse. Also I have this mysterious bundle of wires that have been cut under the drivers seat and I was thinking that it was for the Car Phone that was in the car originally, but I don't know for sure. Everything works but the seat heaters. The phone was gone before I got the car. Was maybe the seat heater relay under the driver's seat? Seats do all their motions so whatever that bundle is, it doesn't affect anything else in the car that I'm aware of.

I'm thinking that Diode is bad, but will have to check the car and see if the seats switches work with the key off. I don't think they do, but I could be mistaken.

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1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.