Nice mind stretch here, I cant't remember for sure but here is what is bobbling about in my defective memory,

Alarm module is bolted to the seat support under the back seat,and is under something (flap of carpet or metal bracket?). its not very big, and has 2(?) connectors. I seem to remember hunting for this part and it was almost staring me in the face.

SRS module is under right side front seat? Each airbag is also called a module BTW and has its own tiny brain.