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I had the same issue on m dads 2005 Z71. It wound up being a bolt fell in the track of the seat and skint a wire and grounded out. resulting in a blown fuse and seats and all windows but the driver window quit working. Also check the connectors under the seat, some of them can be seperated just enough to cause a power problem
Ok I don't know who these people are giving advice but I hope they are not gm mechanics. There is a fuse under the hood marked MBEC 1 50amp. If it blows it knocks out both power seats seat heaters and power windows passenger side front and back. I can't believe all this wiring ****!
Are you also having other things that do not have power, such as the radio or power mirrors, or the wireless door locks / security system? I owned a 1996 Oldsmobile product that had the same problem. I discovered that a circuit breaker in the fuse box was being overloaded. The same circuit breaker that operated the seats also operated the wireless remote. Apparently, the wireless remote receiver was getting "hung" and constantly drawing electricity and tripped the breaker. When the breaker tripped, my seats also quit working. Thus I quit using the wireless remote and the seats have worked fine ever since.
cb means circuit breaker, and I have never had one of these fail.. I have replaced hundreds of window motor/regulator assemblies, and several door switches for this problem also, remove the door switch and check for power with a test light, this will tell you if the breaker is bad, you can also check for power output from the switch at the same time..
The most likely cause is the seat heater elements, they either have excessive resistance or are open - id recommended replacing both driver side element - upper and lower
Yes, they have cicut breakers but there is no power to the fuse block ..
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