TPM Question -- got me stumped--

Has it been cold where your at? I ask that because i've had the light come on after the tires heat up on the road but the spare stays cold. I think if the difference between them gets to around 8 psi it will set ogff the light. In the winter you might want to run your spare a few psi's above the other tires to compensate for this.

 

Each tire has a battery in the stem......mine is blinking also......probably a battery has expired.

 

Blinking for the first couple of minutes after startup indicates a system problem.
One or more of the sensors are not being recognized, or, in my case, repeated attempts to reset the system using the dash button apparently "stuck" the system.. it thought the button was being held constantly.

A quick flash and out at startup is normal.
Flash and remain on indicates a low reading, which is what you would expect from weather changes.