front left Malfunction after battery change 2020 GLS 450




You should have first disconnected the battery (you could have accessed the negative terminal when the seat in place), and THEN removed the seat and disconnected the cables.
I had this issue for the passenger side when I had to access the MBUX headunit to swap it with another one for the full carplay screen and wifi carplay. I contacted @EleBest and he cleared the airbag for the front right for me remotely. It's normal, you just need someone to clear the codes for you. I see you a newbie here. Elebest is forum vendor here and offer remove coding services. Your dealer also can clear this for you but may charge you more am not sure.





