GMC HUMMER EV 2023 Owner's Manual page 285

284 Driving and Operating
2. The brake lights turn on for about
two seconds.
3. The left turn signal light flashes three
times.
4. The right turn signal light flashes three
times.
5. The reverse lights turn on for about
two seconds.
6. Steps 2-5 repeat for approximately on
minute and 45 seconds, or until the test
deactivates.
Touch Stop to stop the test. The test will
automatically end after one minute and
45 seconds.
The sequence also deactivates when any of
the following occur:
The vehicle is turned off.
The vehicle is shifted out of P (Park).
The brake pedal is pressed.
The turn signal is activated.
The hazard warning lights are activated.
Tires
Tire Pressure and Temperature
If the TTPMS sensor-to-vehicle learn process
was completed, the status view will display
the current tire pressure and temperature of
the trailer tires related to the active Trailer
Profile. If a tire s pressure is low or high, the
color of the pressure value will be amber.
If a sensor malfunctions, the values are
dashed lines. If the screen displays Service
Tire Pressure Monitoring System, the
vehicle needs to be taken to a dealer for
service.
Touch to set up the Trailer Tire Pressure
Monitoring System (TTPMS) for the Trailer
Profile. See Trailer Tire Pressure Setup
previously in this section for details on the
setup. Also, touch Sensor Setup if the trailer
tires were rotated or if the tire pressure
sensors in the tires were replaced for this
Trailer Profile. The vehicle will need to
relearn the tire sensors and their locations.
See Trailer Tire Pressure Setup previously
in this section.
Touch Edit Target Pressure to change the
recommended tire pressure for the trailer s
tires. This will change the number at which
the vehicle displays alerts related to trailer
tire pressure.
Maintenance
Touch to view a list of maintenance
reminders for the Trailer Profile.
The Maintenance Status view displays
reminders for the Trailer Profile. Touch a
reminder to view, reset, delete or edit it.
Resetting a reminder will reset the time
and mileage values for the reminder.
The progress bar turns yellow when the
maintenance item reaches 90% complete.