Hi,
When the vehicles are manufactured, different wiring harnesses are used. Also, the Grand Prix will not have the power supply or control module for it.
I won't say it couldn't be done, but it will take a lot of work. What I've done is attach the wiring schematic for the heated seat circuit in a 2002 Grand Prix. Take a look through it and see if it is something you want to perform.
Note: I cut the original wiring schematic in two so it is easier to read. I did overlap the two pics so you can follow them.
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Let me know if you have other questions.
Take care and God Bless,
Joe
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Wednesday, February 24th, 2021 AT 8:50 PM