SELECTABLE Drive Modes

WARNING: This page is about a different variant/trim than selected.

TOW / HAUL MODE: When driving in hilly areas, towing a trailer, or carrying a heavy load and frequent transmission shifting occurs, pressing the TOW/HAUL switch to select TOW/HAUL mode will improve performance and reduce the potential for transmission overheating or failure due to excessive shifting. When operating in TOW/HAUL mode, transmission upshifts are delayed, 8th gear overdrive is prohibited, the Multiple Displacement System (MDS) system is prohibited from cylinder deactivation, and the transmission will automatically downshift (for engine braking) during steady braking maneuvers. The "TOW/HAUL Indicator Light" will illuminate in the Instrument Panel Cluster (IPC) to indicate that TOW/HAUL mode has been activated. Pressing the switch a second time restores normal operation. If TOW/HAUL mode is desired, the switch must be pressed each time the engine is started. The Radio serves as the user interface for the Drive Mode feature. When a vehicle is equipped with this feature the user will be able to select the TOW/HAUL mode in both run (engine not running/engine running) states. The Auxiliary Switch Bank Module (ASBM) houses the TOW/HAUL switch. The ASBM is responsible for performing any diagnostics necessary for the TOW/HAUL switch. When the switch is depressed, the ASBM module will update and send a Local Interface Network (LIN) signal value over the LIN BUS as a command to engage the vehicle in Tow Haul mode.

The TOW/HAUL mode feature will be inhibited if:

The 4 Wheel Drive Low mode is selected while the TOW/HAUL Mode is active the TCM will automatically disengage TOW/HAUL mode.
The TOW/HAUL mode is requested while the 4 Wheel Drive Low mode is already active the TCM will ignore the TOW/HAUL Request.
The Hill Descent Control (HDC) mode is selected while the TOW/HAUL mode is active the TCM will automatically disengage TOW/HAUL mode.
The HDC mode is active the TCM will inhibit the TOW/HAUL feature.

HILL DESCENT MODE: HDC is a low-speed limiter which allows the driver to concentrate on the path of the vehicle while negotiating off-road downhill terrain. HDC will apply hydraulic braking without requiring the driver to apply the brake pedal. HDC activates the front and rear brakes while descending a hill to limit the vehicle speed to a pre-set value. Descent speed is selectable (when the gear shifter is in the drive position) via the transmission gear +/- selectors. HDC is armed by a switch, but the Electronic Stability Control (ESC) will not actively control braking unless the conditions are met to activate the feature.

HDC WILL BE ACTIVE IF THE FOLLOWING CONDITIONS ARE MET:

HDC has been enabled AND the vehicle is on downhill grade of sufficient magnitude (first trial 8%), this requirement is satisfied by sensory input to the ESC module.
Vehicle speed is below the tunable threshold (first trial 20 mph). This requirement is satisfied by sensory input to the ESC module.
Gear selector is in R, N, D, or any numeric indicated value (not P).

HDC WILL DEACTIVATE IF ANY OF THE FOLLOWING CONDITIONS ARE MET:

Vehicle speed exceeds a tunable threshold (first trial 20 mph) for less than 70 seconds. This condition is satisfied by sensory input to the ESC module.
Brakes exceed the calibrated thermal threshold.
HDC is no longer actively controlling the vehicle speed during throttle override.
Vehicle is on a downhill grade of insufficient magnitude (first trial 8%), or is on level or uphill grade.
Vehicle is shifted to P.

HDC shall allow driver override but remain available: The driver may increase vehicle speed above HDC target speed for a short duration by applying throttle to accelerate the vehicle. The speed and duration of the driver override are limited. Upon release of the throttle HDC must control downhill vehicle speed back to the HDC target speed. The rate of return from driver override speed to target speed must be tunable to allow a smooth transition. The driver may decrease the vehicle speed below the HDC target speed by applying the brakes to slow the vehicle. Regardless of the braking level requested from the driver, HDC must control downhill vehicle speed to a maximum of the HDC target speed. The rate of return from the driver override speed to the target speed must be tunable to allow smooth transition. If the driver presses the brake and the brake torque level requested by the driver is insufficient keep the vehicle speed below the target speed set by the driver, the ESC shall continue to hold hydraulic braking in order to avoid an increase in vehicle speed while the driver is manually trying to decrease the vehicle speed.