154 SAFETY
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:
• The driveline is in 4L Range.
• The vehicle speed is below 7.5 mph (12 km/h).
• The electric Park Brake (EPB) is released.
• The 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 approxi-
mately 8%). The set speed for HDC is selectable by the driver
and can be adjusted within the thresholds by using throttle
or brake application.
Driver Override:
The driver may override HDC activation speed with throttle
or brake application at anytime.
Deactivating HDC
HDC will be deactivated but remain available if any of the
following conditions occur:
• Driver overrides HDC set speed with a speed exceeding
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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