Hummer 2007 H3 Owner's Manual page 380

5. Remove the valve cap from the valve cap
stem. Activate the TPMS sensor by
increasing or decreasing the tire's air pressure
for 10 seconds, then stop and listen for a
single horn chirp. The single horn chirp should
sound within 15 seconds, confirming that
the sensor identification code has been
matched to this tire and wheel position. If you
do not hear the confirming single horn
chirp, you will need to start over with step
number one. To let air-pressure out of a tire
you can use the pointed end of the valve cap,
a pencil-style air pressure gage, or a key.
6. Proceed to the passenger's side front tire,
and repeat the procedure in Step 5.
7. Proceed to the passenger's side rear tire,
and repeat the procedure in Step 5.
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8. Proceed to the driver's side rear tire, and
repeat the procedure in Step 5.
9. After hearing the confirming horn chirp
for the left rear tire, check to see if
the TPMS warning light is still flashing.
If it is, turn the ignition switch to LOCK.
If the TPMS warning light is not flashing,
the five minute time limit has passed and
you will need to start the process
over beginning with Step 1.
10. Set all four tires to the recommended air
pressure level as indicated on the Tire
and Loading Information label.
11. Put the valve caps back on the valve stems.