I didn't realize that...although I thought of another way...
Originally Posted by Supercourse
That's the button that also applies to indirect FTM (no sensors in wheels) so doesn't tell you if you have direct TPMS.
The metal valves with a nut on them and plastic caps are the best indicator.
Take 10 psi out of a tire and see if the warning come on immediately at start up or if you have to be driving around.
A direct tpms system will send a signal to the computer of a low pressure scenario. The other system uses abs wheel sensors and measures revolutions of the wheel at speed.
Last edited by x3brian; 01-17-2013 at 11:04 AM.