RAM 2500 2020 Owner's Manual page 153

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 parking brake is applied.

The 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.
The cluster icon and switch lamp 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 lamp will flash for

several seconds then extinguish when HDC
disables due to excess speed.
The cluster icon and switch lamp 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 Hill Start Assist (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 continue 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.
The following conditions must be met in order
for HSA to activate:
The feature must be enabled.

The vehicle must be stopped.

The park brake must be off.

The driver door must be closed.

The vehicle must be on a sufficient grade.

The gear selection must match vehicle uphill

direction (i.e., vehicle facing uphill is in
forward gear; vehicle backing uphill is in
REVERSE (R) gear).
HSA will work in REVERSE gear and all

forward gears. The system will not activate if
the transmission is in PARK or NEUTRAL (N).
For vehicles equipped with a manual trans-
mission, if the clutch is pressed, HSA will
remain active.
SAFETY 151
4