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This is covered pretty well in the FAQ's. The most likely problem is the thermostat in the seat heating pad itself. At the $80 to $90 a new pad will cost you, first do a little trouble-shooting. Get under the seat in question and dissconnect the supply wires and check voltage from the switch to ascertain power to the coupling. If you have power at that point, you know everything upstream is working. Then (with the temp in the car below 75 F) check the other side of the coupling for continuity. If the check fails, you have an open in the wireing somewhere downstream of the plug. Remember, the thermostat will be open if the temp at the heat pad is above 75 degrees F, this can vary a little, so make sure the temp is lower for a good continuity check. If the check still fails, you will need to remove the seat from the car and check the connections between the upper and lower seat pads, as well as the thermostat connections. The power supply wire will quite often break off where it connects to the thermostat. This is easily fixed be soldering it back on the thermostat. Also check each pad individually for broken wires. Liken the pad to a water line, anywhere you have a break, the water will not flow through the line. Both pads have to connect in series for a cpnnection that flows in, through the pads, and back out through the connection for a complete circut. Before you reassymble the seat, double check the continuity or you will have put everything back together in vain.
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