RAM 3500 2019, Owner'S Manual

Page: 138 / 484

136 SAFETY
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
summarizes 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 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, 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 following conditions occur:

The driver pushes 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 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 LED icon, which offers
feedback to the driver about the state HDC is in.

The cluster icon and switch lamp will illumi -
nate and remain on solid when HDC is
enabled or activated. This is the normal oper -
ating condition for HDC.
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