GMC HUMMER EV 2022 Manual page 104

Warning (Continued)
pressure listed on the tire sidewall. See
Tire Sidewall Labeling 0 95 and
Vehicle Load Limits 0 67.
If the tire is overinflated by more than
35 kPa (5 psi), the horn will sound multiple
times and the turn signal lamp will continue
to flash for several seconds after filling
stops. To release and correct the pressure,
while the turn signal lamp is still flashing,
briefly press the center of the valve stem.
When the recommended pressure is reached,
the horn sounds once.
If the turn signal lamp does not flash within
15 seconds after starting to inflate the tire,
the tire fill alert has not been activated or is
not working.
If the hazard warning flashers are on, the
tire fill alert visual feedback will not work
properly.
The TPMS will not activate the tire fill alert
properly under the following conditions:
There is interference from an external
.
device or transmitter.
The air pressure from the inflation device
.
is not sufficient to inflate the tire.
There is a malfunction in the TPMS.
.
There is a malfunction in the horn or turn
.
signal lamps.
The identification code of the TPMS
.
sensor is not registered to the system.
The battery of the TPMS sensor is low.
.
If the tire fill alert does not operate due to
TPMS interference, move the vehicle about
1 m (3 ft) back or forward and try again.
If the tire fill alert feature is not working,
use a tire pressure gauge to confirm tire
pressure.
Air Down Mode
Air Down Mode allows the driver to set a
custom tire pressure for better traction
during off-road driving. Visual and audible
alerts outside of the vehicle will alert the
driver when the desired tire pressure has
been reached.
To enable Air Down Mode:
1. Park the vehicle in a safe, level place.
2. Place the vehicle in P (Park).
3. Place the vehicle in ON/RUN or press and
hold the POWER button for more than
five seconds. See the owner's manual.
4. Touch the Off-Road app icon on the
infotainment home page.
Vehicle Care
5. Touch the Air Down Mode icon.
6. Select the target pressure, then press
START.
7. Choose which tire to deflate. Remove the
valve cap, then press and hold the tire
valve stem.
During tire deflation, the turn signal
lamp closest to the tire being deflated
will start flashing.
When the target pressure you selected
in step 6 is reached, the horn sounds
once and the turn signal lamp will stop
flashing and turn solid for several
seconds before turning off. Replace the
valve cap. Wait for the turn signal lamp
to turn off before deflating the next tire.
If you deflate the next tire while the
turn signal lamp is still on, the Air Down
Mode will not work properly.
Repeat step 7 until all tires have been
deflated. Same steps can be followed for
inflating all tires to target pressure.
While in Air Down Mode, after all tires have
been deflated lower than the vehicle's
recommended tire pressure, the low tire
pressure warning light and the DIC warning
message may come on for all tires.
103