Air bag light/ passenger seat issue

[DocB]

So, 105k service was done at the dealer cause I haven't done anything but fluids since new. Diagnosed a bad front wheel bearing, but Z1 Motorsports and YouTube fixed that. Only other issue was air bag light wouldn't stay reset more than a day. Throwing code b1018 which they said was passenger seat "area" Of course, they recommended a control module ($1500) but if that didnt work, a sensor ($450) and if that didn't work, a harness ($400) So, the seat is 4 bolts and 3 plugs. It's out. I'm going to try cleaning all connections first, but while it's
out, has anyone else had to deal with this? I'm thinking sensor since nobody's sat in the passenger seat for 3 years, but my lunchbox was there every day going back and forth 35 miles to n from work.
- 2012 Roadster