Driver Override; HDC Target Set Speeds- Page 96

2018 Jeep Wrangler JL User Guide

Table of Contents

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• Driver door is closed. (If doors are attached,

then door must be closed. if doors are
detached, then driver seatbelt must be
buckled.)

Activating HDC

Once HDC is enabled it will activate auto-
matically if driven down a grade of sufficient
magnitude. The set speed for HDC is select-
able 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 af-
fect the gear chosen by the transmission.
When actively controlling HDC the transmis-
sion 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 insuffi-

cient 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 (Driver door opens if

doors are attached or driver seatbelt 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.

SAFETY

94

Detailed Information for 2018 Jeep Wrangler JL User Guide

Lists of information found in 2018 Jeep Wrangler JL User Guide - Page 96

  • 1.2 mph (2 km/h) • D = 0.
  • 1.2 mph (2 km/h) • 3rd = 1.
  • 2.5 mph (4 km/h) • 5th = 3.
  • 3.7 mph (6 km/h) • 7th = 4.
  • 5.0 mph (8 km/h) • 9th = 5.
  • Driver door is closed.
  • P = No set speed.
  • R = 0.
  • N = 1.
  • D = 0.
  • 1st = 0.
  • 2nd = 1.
  • 3rd = 1.
  • 4th = 2.
  • 5th = 3.
  • 6th = 3.
  • 7th = 4.
  • 8th = 5.
  • 9th = 5.
  • 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 insuffi- cient magnitude, is on level ground, or is on an uphill grade.
  • Vehicle is shifted to park.
  • The driver pushes the HDC switch.
  • The driveline is shifted out of 4WD Low Range.
  • The parking brake is applied.
  • Driver door opens (Driver door opens if doors are attached or driver seatbelt 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.

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