Driver side power seat and heated seat failure

[C Scott Porter]

The drivers power seat stopped functioning. And the heated seat function for both sides quit. At the same time. I have checked every fuse that could be even remotely associated with these functions. The only fuse that was found to be bad was the 40 amp block fuse labeled Post #1 (engine compartment panel). did not fix the issues. I really hate to pay a dealership to work on anything, but i am at wits end. I could really use advice or a good set of schematics.
Thanks.

 

[Kingx1]

I'm right there with you. Just today If i turn the heated seats on my passenger side, they both shut off. However i can use the drivers side on its own no problem. Very strange

 

[aquacure]

I'm right there with you. Just today If i turn the heated seats on my passenger side, they both shut off. However i can use the drivers side on its own no problem. Very strange

Here is a good video that explains what is going on when the seats stop heating. Be aware they are trying to sell their replacement parts.

Now as to why the power seat would stop working I'm not sure.

 

[Kingx1]

Thanks a lot bro! The video explained exactly what I have going on. I watched a couple if their videos too. Very good installation videos.

 

[oldchev]

Hi gang...my 04 Denali heated seats (front) and seat power function have both/all quit at same time. I haven't got into this yet but as I understand there is a memory seat module that controls the seats movement and heated seats as well as the memory foot pedals. The way I understood is if any one of the components position sensors or heated pads are kaput, then all are affected? Not sure.
A write up I read also says there is a gray connector near the floor under the driver's seat and to check the orange and black wires for burned connection. That's where I am headed next. Back seats heat up just fine.

 

[oldchev]

My problem is corrected. Looked at several forums with lots of ideas. Some seem pretty darn good, however this is what I did and mine is now working as intended. Who knows what the cause was but it seems cutting power to the control modules will sometimes reset them.
Fix procedure: Under hood fuses. Remove fuse RR HVAC 30A. Remove HVAC/ECAS 10A. If they look good reinstall both. Drivers side fuse panel. Remove 25A circuit breaker (its silver and the only one that looks like that). Reinstall. All done with key off and battery connected. Install key and start vehicle. Test the functions. This corrected the dead seat adjustment controls and inoperative seat heaters for both.
Hope this helps somebody else.

 

[oldchev]

Well...that worked once. Dead again this time the fuse experiment did nothing. Since the drivers seat is dead and passenger seat works on adjustment, and both seat heaters are dead, its gotta be a power connection or the seat control module under the drivers seat. Looks like the control modules are $300 up depending on supplier and brand. GM 15837361, Dorman 590-002 or APDTY 6011130. Since the fuse experiment did reboot it (maybe), I am thinking the module but pricey so worth more investigation.
Elsewhere in this forum, The Seat Shop guy from an earlier post says its probably the module.

 

[oldchev]

I believe I have my answer to the drivers side -dead seat- and -seat heater malfunction-.
The 14 pin connector (see picture) bottom back under drivers seat caries the main orange and black power wires that many have spoken of. The orange wire (left side of connector) looks like its has been hot. when I moved the wiring connector the seat works and everything came on. Moved it again and stopped working. I did this several times and could create and fix the condition here. Also in the picture you can see the routing of the wire wraps (without a sleeve) around part of the seat frame which will in time fray the wires in the loom. As info, the yellow connector is for the air bag. That 2 wire sleeve wraps around the other wires which looks like it restricts the 14 wire loom so I will re route that.
I did nothing else to repair this yet since I know what it is. Several have suggested (in other forum comments) to simply replace the connector for the affected wires to create a good circuit.
Regardless, its not the $300 seat control module.