Hello. Been there, done that. I'd put money on a failed BCM.I fought with one like that last year. It was a 1999 Buick Century. Different car but the same system. Finally, I bought a used BCM from eBay for about $25.00. Installed it and ran the pass lock relearn procedure. Car was fine after that.
Attached, you'll find the removal and replacement procedure as well as the 30 minute relearn procedure. Pull the BCM and search eBay for that part number. Get the exact part number. Once it's installed and and relearned, you should be good to go.
Do that and let us know how it goes. Good luck.
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Tuesday, May 4th, 2021 AT 4:07 PM