my car doesnt have monsoon or onstar either go buy the cheap one at autozone like 21 dollars i bought the expensive one online with the door dinger an **** 65? dont do it it ****s with your car get the cheap simple one it works great hooked it up with a steering wheel control interface works great just make sure u disconnect your battery for afor awhile an if it acts funny disconect for a bit longer an run a seperate power line to the assesory fuse on the passenger side