Long story short, a stupid mistake. A friend was helping me installing a new battery around 10pm for a midnight cruise. Without looking, he placed the battery reverse so now the positive is on the negative terminal and vice versa. The horn came on for few seconds as soon as we made contact. I stepped in and disconnected one of the side as soon as I realized what just happened. Looks like we only blew the 120A ACG fuse and after replacing that the car came back to life again. No CEL and everything checked out good. The only remaining problem we see at the moment is the OEM keyless entry no longer working. We tested with both remotes so it's safe to say it can't be the remote. Now I'm afraid there might be other unknown problems. Anyone know what else to check or how to reset the keyless unit if possible? Thanks!