I have a 2008 Cobalt LS.
I started the 'TPMS Matching Process for Vehicles
without Remote Keyless Entry (RKE)'
I can start the process and reach the passenger side front tire:
5. Start with the driver side front tire
6. Remove the valve cap from the tire’s valve stem.
Activate the TPMS sensor by increasing or
decreasing the tire’s air pressure for about
eight seconds. The horn chirp, can take up to
30 seconds to sound. It chirps one time and then all
the turn signals flash one time to confirm the sensor
identification code has been matched to the tire/
7. The passenger side front turn signal comes on to
indicate that corner sensor is ready to be learned.
Proceed to the passenger side front tire and
repeat the procedure in Step 6.
Till here everything is good but when I increasing or
decreasing the tire’s air pressure in the second tire/passenger side front tire the horn chirp doesn't come up.
What could be the reason?