Not sure where the module is, possibly in the drivers door. But, regardless of what you will probably read on this forum or anywhere else, if you are not using the OEM, band mounted wheel mounted sensors you will have problems. I have a '10 Adrenalin, when I got it I fought the problems you are describing. I could see it had aftermarket stem mounted sensors. I could reset them with my scanner and drive maybe 40 miles and the light would come on. Dismounted the tires and put in the blue, band mount Ford sensors, problem solved. For what it's worth, I manage a fleet of police vehicles, and we have approximately 60 Crown Vic's still in service. They use the same blue sensor and because of cost difference we have tried "replacement" stem mounted units, the aftermarket advertises them to work, but they have the same issues as my ST. Last time I checked, Motorcraft did not list anything but the band mounted units for my ST or the CV's