RAM 2015 1500, Operating Information Manual, Page: 331 / 998

Activating HDC
Once HDC is enabled it will activate automati-
cally if driven down a grade of sufficient magni-
tude (greater than approximately 8%). The set
speed for HDC is selectable by the driver, and
can be adjusted by using the Electronic range
switches located on steering column shifter. The
following summarizes the HDC set speed:
Gear Approximate HDC Set Speed
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)
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)
Gear Approximate HDC Set Speed
8th 5.0 mph (8 km/h)
9th 5.6 mph (9 km/h)
NOTE:
During HDC the ERS +/- shifter input is used
for HDC target speed selection but will not
affect the gear chosen by the transmission.
During HDC the transmission will shift ap-
propriately for the driver-selected set speed
and corresponding driving conditions.
Driver Override:
The driver may override HDC activation 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 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
magnitude (less than approximately 8%), is
on level ground, or is on an uphill grade.
•
Vehicle is shifted to park.
Disabling HDC
HDC will deactivate and be disabled if any of the
following conditions occur:
•
The driver presses the HDC switch.
•
The driveline is shifted out of 4WD Low
Range.
•
The parking brake is applied.
•
Driver door opens.
•
The vehicle is driven greater than 20 mph
(32 km/h)for greater than 70 seconds.
•
The vehicle is drive greater than 40 mph
(64 km/h) (HDC exits immediately).
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