I got a new to me 2017 Tahoe premier this week and had a quick hopefully not complicated question. Came with two remotes, one I got says I'm key two my wife's days she's key three. I wasn't to be able to make hers set up so she can program her seat to auto memory position when she gets in but I have to make her key, key one. How do I make her key key one or reset them all so they're one and two?

 

Scan tool is needed to erase all the fobs in the memory and then fobs need to be reprogramed into the computer.
Previous owner must have lost the original #1 and they just added the third fob.