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SAFETY 105
Hill Descent Control (HDC) — If Equipped
Hill Descent Control (Trailhawk)
Hill Descent Control (HDC) is intended for low
speed off-road driving while in 4L Range. HDC
maintains vehicle speed while descending hills
during various driving situations. HDC controls
vehicle speed by actively controlling the brakes.
HDC has three states:
1. Off (feature is not enabled and will not
activate).
2. Enabled (feature is enabled and ready but
activation conditions are not met, or driver
is actively overriding with brake or throttle
application).
3. Active (feature is enabled and actively
controlling vehicle speed).
Enabling HDC
HDC is enabled by pushing the HDC switch, but
the following conditions must also be met to
enable HDC:
Driveline is in 4L Range.
Vehicle speed is below 7.5 mph (12 km/h).
Electric Park Brake (EPB) is released.
Driver’s door is closed.
Activating HDC
Once HDC is enabled, it will activate
automatically if driven down a grade of
sufficient magnitude (greater than
approximately 8%). The set speed for HDC is
selectable by the driver and can be adjusted
using brake and throttle input.
Driver Override:
The driver may override HDC activation with
throttle or brake application at any time.
Deactivating HDC
HDC will be deactivated but remain available if
any of the following conditions occur:
Driver overrides HDC set speed with throttle
or brake application.
Vehicle speed exceeds 7.5 mph (12 km/h)
but remains below 25 mph (40 km/h).
Vehicle is on a downhill grade of insufficient
magnitude (less than approximately 8%), is
on level ground, or is on an uphill grade.
Vehicle is shifted to PARK (P).
Disabling HDC
HDC will be deactivated and disabled if any of
the following conditions occur:
The driver pushes the HDC switch.
The driveline is shifted out of 4L Range.
The driver’s door opens.
The vehicle is driven greater than 25 mph
(40 km/h) (HDC exits immediately.)
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20_BV_OM_EN_USC_t.book Page 105
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