ok I called the dealer and got the numbers$127.00 for the back and 142.00 for the seat. WOW Now GM Parts Direct had the back for $100.00 does that sound right that much diff ?? I wonder if I took the cover off if I could see and repair the bad spot ? Also is there a way to be sure its the element. I have a DMM but would need help figuring it out.
I also want to be sure that is not what ever is clicking in the dash. My module has 3 sets of wires coming out, 1 set has 2 wires in a green connector, 1 set has 2 wires in a grey connector the last has about 5 wires in a blak connector. Thanks again guys for the help and insight.

Using your DMM, pull the connections from both the driver'* and passenger seats and compare readings. Check the voltages on the connector that supplies the power, and then resistance readings for heating elements on the other connector.

Also, if the passenger side starts acting the same way as the driver'* when the connector is pulled, it will show that is normally what happens when the heater opens.

Ok here is what I did. The one wire has 2 wires in it green connector both sides check the same. The other wire has 4 wires in it and branches off the 2 wire line, I tested the green and white wire on the drivers side and get no reading, I did the same to the passengers side and it read 1.9. Now the other wire is a bigger connector with probably 5 or 4 wires in it fgoing to the module I assume its the power/switch/hi-lo etc
So.. Not knowing what im doing I assume the drivers side bottom element is bad. I started taking the seat bottom out which doesnt seem to bad of a job as soon as I figure how to remove the arm rest. Would you guys suggest I but the bottom element and change it first or could it be something else. Again the light stays on but the module keeps clicking every 20 seconds or so and no heat. thanks so much guys

That link said " do not attempt to remove old heater element" just cut the wires ??? It also said that ALL heaters needed to be replaced at once, can't I just do the bottom one ?? Is there really anyway to know 100% that it is the bottom one without spending 100.00 ?? I found one part # from GM 25698795 but how do I know this is the right one ?

just was thinking. Why couldn't I unplug the wire going to the bottom element and jump a pc of wire across the two terminals, this way it would allow the back to heat so I knew for sure it was the bottom element or do it to the back and see if the bottom works ? Wouldn't this complete the circut to test it ??

You could try calling a dealer to see about a part number. The part numbers listed in the TSB are different, but they start at 2000. I don't know if the '99s would have the same or not.

You could try running a jumper to the back heaters, but as none of them work, it would indicate that they are wired in series. It'* possible for you to burn out the backs in the process.

Well I wrecked it, lol I took the seat cover off and started trying to find broken wires and ended up tearing all the fine blue heater wires out so now .... Oh well either no heated seat on that side or buy a replacement one that jsut does the bottom. there are like 3 sets or wires under there one for each side leg then another that does the butt that has like 5 wires coming out then I still wont know for sure if its the bottom or the back. Should I jsut buy one that does the bottom an after market one instead of paying for the GM one and finding out the back is bad ?? What a waste of time...