GMC HUMMER EV 2022 Owner's Manual page 206

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Entry/Exit Height
Entry/Exit Height is 50 mm (2 in) lower than
Normal Height. This ride height lowers the
vehicle for easy entry and exit from the
vehicle as well as providing a lower height
for loading and unloading cargo.
This ride height can be selected in the Ride
Height Menu at any vehicle speed. When
Entry/Exit Height is selected at higher
speeds, the vehicle will wait to lower until
the vehicle slows to less than
15 km/h (9 mph).
The vehicle will automatically raise to
Normal Height from Entry/Exit Height when
speed increases above 16 km/h (10 mph).
If no door has been opened since lowering
to Entry/Exit Height, the vehicle will wait to
raise to Normal Height until 30 km/h
(19 mph). This gives the driver more
flexibility when lowering to Entry/Exit
Height for passenger pick up and drop off.
The driver can enable Easy Exit Vehicle
Height Mode to automatically lower to
Entry/Exit Height when the vehicle is shifted
to P (PARK). Easy Exit Vehicle Height Mode
may be enabled via the infotainment screen
under Settings>Vehicle>Ride Height. When
the vehicle is higher than Normal Height,
Easy Exit Vehicle Height Mode is disabled.
When the vehicle is in Tow/Haul Mode,
Off-Road Mode, Terrain Mode, or it senses a
trailer is connected, Easy Exit Vehicle Height
Mode is disabled.
Increased Height
Increased Height is 46 mm (2 in) higher than
Normal Height. This ride height raises the
vehicle for off-road use. Increased Height can
be selected in the Ride Height Menu while
vehicle speed is less than 137 km/h (50 mph).
Terrain Mode will automatically set
Increased Height.
Aerodynamic Height
Aerodynamic Height is 25 mm (1 in) lower
than Normal Height. This ride height lowers
the vehicle at higher vehicle speeds to
improve aerodynamics.
The vehicle will lower to Aerodynamic
Height when vehicle speed exceeds 137 km/h
(65 mph) for a period of time. The vehicle
will raise to Normal Height when the vehicle
slows to less than 48 km/h (30 mph).
Aerodynamic Height is automatically
disabled when a trailer is connected to the
vehicle, Tow/Haul Mode is active, or the
vehicle is at Increased Height.
Driving and Operating
Suspension Modes
The air suspension has two special modes,
Service Mode and Alignment Mode, located
in the infotainment screen under
Settings>Vehicle>Suspension.
Service Mode
Service Mode will disable all air suspension
operation including raising and lowering the
vehicle and operation of the air compressor.
This mode is useful when the vehicle is
being towed on a flat bed or when any
work under the vehicle is being performed.
Service Mode is recommended when the
vehicle is put on a hoist or a floor jack is
used to raise a corner. Service Mode
automatically disables when vehicle speed
exceeds 32 km/h (20 mph).
Alignment Mode
Alignment Mode will optimize the vehicle
height to provide the most accurate wheel
alignment. This mode should be enabled
once the vehicle is driven onto the
alignment station.
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