I drove the vehicle and it did not smell that way all the time. Both the breaker and fuse are great. The adjustable pedal position sensor, seat recliner position sensor and both heat seat thermistors share the same 5 volt reference internal to the Drivers Seat Module. My 04 Z71 just started this yesterday. I spent most of my day turning off the switch every 5 seconds.
The passenger side windows stopped working and both passenger and driver power seats stopped working. The damn heater still came on. She was thrown from the vehicle and also another person was in the car as well. You'll still get the heat through it, but it will affect the performance somewhat. Some are sewn right into the seat cover. They'll usually burn out in one spot. The latest two biggies being my new battery going completely dead if I haven't started it in a couple of days this has happened twice lately and my battery has checked out fine.
Sometimes it comes on while just sitting in park. When it does, the switch lights and lets you know, hence the Christmas tree effect. I read osmewhere that it could be the driver's seat module needs reprogrammed or replaced. Before completely failing it did seem to get very hot when used even on low and then just quit working. I am pretty sure you might have the same problem since it is a Chev.
Jonathan answered 8 years ago This sounds more like a wiring problem. It all quite at the same time. This being said the power wire which is orange that runs from the seat motor under the drivers seat and runs under the car mat and up the dash. After the replacements, the problem persisted. Also i put a new key cylinder in the ignition hoping it would crank better. Two hours later I started the car and the smoke began again, this time much worse. Seat Heat Sensor- Normal range 1V-4V If a parameter is found to be out of range inspect circuits for any opens, shorts to ground, or voltage.
Seat Heat Sensor- Normal range 1V-4V Drvr. Make sure the correct sensor, adjustable pedal position sensor, is disconnected. Unfortunately it is not an inexpensive fix. I pulled the 10a fuse and wa-la, no more hot seat. The fuse panel on the driver side of the dash, the one by the door, has the heater fuse in it.
I haven't had the ignition key problem. If water gets to the contacts, that too will cause problems. If so where is it located? If yes, what you have is an air bubble that hangs at the heater hose until pressure from the water pump blows thru it as the engine speeds up. While driving approximately 55-60 mph on normal road conditions, the four wheel drive activated without assistance. Is there a pressure switch in the seat as well to tell the computer someone is actually sitting in the seat?? You will know themostat opens when top radiator hose is hot indicating coolant is flowing. I am not sure of the exact day that this happened.
Disconnect the recliner position sensor and see if heated seats start working correctly, if so replace. I am not sure if there is anything that can be done about this or not but I do not want anyone to get hurt. They tore the seat out of the car and there was a fire under the leather. I took the button thing out of the door and opened it, it was dry. Unfortunately it is not an inexpensive fix. I am having the exact opposite situation in my '04 Suburban. There is something somewhere that is shorting while wet.
I'm leaning towards a leak in the heater core if no fluid is visable and you smell it. Would it stop if you disconnect the switch behind the door panel? Need to get my seat bottoms replaced this year with foam, etc. The four wheel drive warning indicator illuminated intermittently on the instrument panel. My 05 Suburban had the same issue. October 6th, I speak with sergio and after speaking with the gm rep he is not willing to cover the damage and the extended warranty will cover the hardware, but not the actual seat cushion or cover. I thought I was accidently hitting the buttons, but discovered this morning that it was doing it on its own.
It would be very useful to know if the codes listed are set. The problem being that the seats don't work although the switches apparently are working. On October 5th, 2005 I smelled something burning. The posts above regarding the seal around the switch makes a good point. The switch is not watertight at all and the moisture gets in. The consumer disconnected to power supply to the heated seat.