Tire sensor blinking for One Minute Please Help

I lowered the spare tire today and flipped it so I can access the valve, its a Michelin tire and its got 32 psi and my other tires are tiger paws and they have 32 psi. I turned the switch to the on postion and the light comes on and then blinks for one minute and then stays on. I then pushed the reset button down and it flashes 3 times and then starts over blinking 60 times or for one minute. After that I tryed to turn switch off after the 3 flashes and the light still comes back. Im I doing these right does the motor have to be running or do I have a bad sensor. I See now there is so sort of tint on back window bought used but its not to dark at all could that be the issue. While I wait for reply I m going out to open the back window and try agian . Im thing of buying a sensor off ebay and when I get new wheels then try to figure out if one is damaged. Its a 07 5 lug I4 Speed, bought used a week ago and just figured it was the spare. PLease any info is welcome