I spent a lot of time researching GM's factory heated seats when I wanted to install heated seats in my cloth 1LT. You can see my how-to link in my signature.
GM has a lot of safety features in their heated seat circuits. There's even a heated seat control module. I think that's under the drivers seat.
First off I'd check the fuse box for blown fuses. I think both seats run off the same circuit, so chances are it's not a fuse. Over time the resistance of the heated seat mats increase. If they increase too far, the heated seats go into standby protection.
I'm guessing the drivers side has had more sitting in it, and there's a short in either the bottom but seat cushion or the seat back. Do both the butt and the back go cold, or can you determine which one?
You may have to find the wiring connectors for the pads, unzip the leather seat back, zippers are at the seams in the back bottom. Sliding the seat forward and access from the back. (See my pictures in my thread.)
Disconnect the heat pad on the butt. Either check resistance with a multimeter, or now try the heated seats with the butt disconnected. Somehow you need to determine which heating element you are going to replace. They are about $60 each, and while both will be accessible, if your trying to save money troubleshoot the resistance of the heated pad circuit, and see if the seat will fire up, with the bad pad unplugged.
Good Luck-
GM has a lot of safety features in their heated seat circuits. There's even a heated seat control module. I think that's under the drivers seat.
First off I'd check the fuse box for blown fuses. I think both seats run off the same circuit, so chances are it's not a fuse. Over time the resistance of the heated seat mats increase. If they increase too far, the heated seats go into standby protection.
I'm guessing the drivers side has had more sitting in it, and there's a short in either the bottom but seat cushion or the seat back. Do both the butt and the back go cold, or can you determine which one?
You may have to find the wiring connectors for the pads, unzip the leather seat back, zippers are at the seams in the back bottom. Sliding the seat forward and access from the back. (See my pictures in my thread.)
Disconnect the heat pad on the butt. Either check resistance with a multimeter, or now try the heated seats with the butt disconnected. Somehow you need to determine which heating element you are going to replace. They are about $60 each, and while both will be accessible, if your trying to save money troubleshoot the resistance of the heated pad circuit, and see if the seat will fire up, with the bad pad unplugged.
Good Luck-