Van beeps in series of five when I start it and air bag module light does not work?

My van started beeping five times when I started it and I've read online that this is due to an issue with my SRS or airbag module. My airbag module light does not appear on the dash at all so I figured I needed to change the bulb since that's what I seen a lot of people online saying, but I changed it out and it still doesn't turn on and the beeping is still there. I'm in the process of converting this van into a small camper and so I removed wiring in the back that led to accessories I didn't need and took it out, such as a powered bench seat, tv, and radio. I'm not sure if that somehow would have tied into the SRS or if any of the wires for it leads to the back of the van? I've checked the fuses and none of them are burnt out but when I remove the fuse five the beeping stops, which is the fuse for the airbag module, if that means or tells anything. I haven't messed with any wires at all beneath the dash, and when I removed my drivers and passengers' seat to replace the carpet I removed a cigarette plug box beneath the driver's seat and then plugged everything back up afterwards. I'm stuck and cannot figure out the issue, so any help or info is appreciated. Thank you!