check the air bag plugs under the pass seat, anything yellow is air bag related. take it off and back on a few times to clean it.
the module under the seat, if your cowl has ever leaked and the floor got soaking wet a number of times, it could be bad, that leaking water can make it to the back seat foot area, so water can get to it.
no need to pull fuses if you unhook the battery neg cable. and as far as the seat plugs, id just do that car off keys out. i only fear the air bag its self when plugging it back in.