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238
SAFETY
Enabling HDC
HDC is enabled by pushing the HDC switch, but the fol-
lowing conditions must also be met to enable HDC:
•
The driveline is in 4WD Low.
•
The vehicle speed is below 5 mph (8 km/h).
•
The parking brake is released.
•
The driver door is closed. (If doors are attached,
then door must be closed. If doors are detached,
then driver seat belt must be buckled.)
Activating HDC
Once HDC is enabled it will activate automatically if
driven down a grade of sufficient magnitude. The set
speed for HDC is selectable by the driver, and can be
adjusted by using the gear shift +/-. The following sum-
marizes the HDC set speeds:
HDC Target Set Speeds
•
P = No set speed. HDC may be enabled but will not
activate
•
R = 0.6 mph (1 km/h)
•
N = 1.2 mph (2 km/h)
•
D = 0.6 mph (1 km/h)
•
1st = 0.6 mph (1 km/h)
•
2nd = 1.2 mph (2 km/h)
•
3rd = 1.8 mph (3 km/h)
•
4th = 2.5 mph (4 km/h)
•
5th = 3.1 mph (5 km/h)
•
6th = 3.7 mph (6 km/h)
•
7th = 4.3 mph (7 km/h)
•
8th = 5.0 mph (8 km/h)
•
9th = 5.6 mph (9 km/h) – If Equipped
NOTE:
During HDC the +/- shifter input is used for HDC target
speed selection, but will not affect the gear chosen by
the transmission. When actively controlling HDC the
transmission will shift appropriately for the driver-
selected set speed and corresponding driving
conditions.
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 20 mph (32 km/h) but
remains below 40 mph (64 km/h).
•
Vehicle is on a downhill grade of insufficient magni-
tude, is on level ground, or is on an uphill grade.
•
Vehicle is shifted to PARK.
Disabling HDC
HDC will be deactivated and disabled if any of the fol-
lowing conditions occur:
•
The driver pushes the HDC switch.
•
The driveline is shifted out of 4WD Low.
•
The parking brake is applied.
•
The driver door opens. (Driver door opens if doors
are attached or driver seat belt is unbuckled if doors
are detached.)
•
The vehicle is driven greater than 20 mph
(32 km/h) for greater than 70 seconds.
•
The vehicle is driven greater than 40 mph
(64 km/h) (HDC exits immediately).
•
HDC detects excessive brake temperature.
Feedback To The Driver
The instrument cluster has an HDC icon and the HDC
switch has an indicator light, which offers feedback to
the driver about the state HDC is in.
•
The cluster icon and switch indicator light will illumi-
nate and remain on solid when HDC is enabled or
activated. This is the normal operating condition for
HDC.
•
The cluster icon and switch indicator light will flash
for several seconds then extinguish when the driver
pushes the HDC switch but enable conditions are
not met.
•
The cluster icon and switch indicator light will flash
for several seconds then extinguish when HDC dis-
ables due to excess speed.
•
The cluster icon and switch indicator light will flash
when HDC deactivates due to overheated brakes.
The flashing will stop and HDC will activate again
once the brakes have cooled sufficiently.
WARNING!
HDC is only intended to assist the driver in controlling
vehicle speed when descending hills. The driver must
remain attentive to the driving conditions and is
responsible for maintaining a safe vehicle speed.
Hill Start Assist (HSA)
The HSA system is designed to mitigate roll back from a
complete stop while on an incline. If the driver releases
the brake while stopped on an incline, HSA will con-
tinue to hold the brake pressure for a short period. If
the driver does not apply the throttle before this time
expires, the system will release brake pressure and the
vehicle will roll down the hill as normal.
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