Driving and Trail Features

Hill Descent Control 

When the hill descent control switch on the AWDMSS is pressed, the ATCM sends a hill descent message to the ABS module over the FD-CAN. Once vehicle speed is between 5 km/h (3 mph) and 32 km/h (20 mph) and the transmission is in REVERSE or any forward gear, the ABS module uses the hydraulic pump motor and the solenoid valves to maintain the speed set by the driver. If the speed is increased or decreased outside of the operational window, the system remains active but descent speed cannot be set or maintained.

The hill descent control feature requires a cool down period after sustained use. The ABS module continually monitors the descent speed, angle of descent, pump motor run time and solenoid valve use. Once the ABS module determines a cool down period is needed, the module sends a message to the GWM over the FD-CAN. The GWM relays the message to the IPC over the HS-CAN3 to display HILL DESCENT CONTROL OFF SYSTEM COOLING in the message center.

Hill descent control has 3 modes of operation:

• At speeds below 32 km/h (20 mph): when the hill descent control switch is pressed and conditions are  correct for hill descent activation, the hill descent control system is enabled. The hill descent indicator illuminates solidly and the message center indicates hill descent control is active.
• At speeds below 32 km/h (20 mph): when the hill descent control switch is pressed and conditions are not  correct for hill descent activation; the hill descent control system is enabled, the hill descent control indicator illuminates solidly and a message is displayed in the message center indicating the reason hill descent is not active.
• At speeds above 

  32 km/h (20 mph): when the hill descent control switch is pressed, the hill descent control system is not enabled and the hill descent control indicator does not illuminate. Once the vehicle slows to below 32 km/h (20 mph), the hill descent control switch must be pressed again to enable the hill descent control system.

Selectable Drive Modes 

The selectable drive mode system optimizes driveability and comfort as well as maximizing traction while operating on different types of terrain. Drive modes are selected using the AWDMSS and the ATCM controls the drive mode selection. When a drive mode is selected, the ATCM sends the drive mode message to the ABS module over the FD-CAN. When the ABS module receives the message, it alters the intervention thresholds for the stability and traction control features based on the selected mode. The ABS module also sends the drive mode message out to several other modules. The following modules receive the message and respond by altering their operation as follows:

• AWD module: automatically engages and disengages specific 4WD modes and raises or lowers torque output based on the selected mode.
• PCM: adjusts throttle response and gear changes to enhance powertrain response based on the selected mode.
• PSCM: adjusts steering effort and feel based on the selected mode.

The following drive modes are available:

• Baja 

  : For high speed off-road driving. Baja mode optimizes the throttle control for better response and torque delivery.

• Eco 

  : For efficient driving. This mode helps deliver maximum fuel efficiency and helps to increase driving range.

• Mud / Ruts 

  : For off-road driving. This mode enhances vehicle performance to traverse muddy, rutted or uneven terrains.

• Normal 

  : For everyday driving. This mode is a perfect balance of excitement, comfort and convenience. This is the default mode after each ignition cycle.

• Rock Crawl 

  : For off-road driving and optimum rock-climbing ability. Rock crawl mode optimizes the throttle and transmission response to provide additional control of the vehicle.

• Sand 

  : For off-road driving on soft, dry sand or deep snow.

• Slippery 

  : For less than ideal road conditions such as snow or ice covered roads. Slippery mode lowers throttle response and optimizes shifting for slippery surfaces.

• Sport 

  : For sporty driving with improved performance handling and response. This mode increases accelerator pedal response and provides a sportier steering feel. The powertrain system holds onto lower gears longer, allowing the vehicle to accelerate faster.

Drive mode changes are not available when the ignition is off. If a mode is unavailable, the system defaults to Normal mode.

Trail Control 

When the trail control switch is pressed, the ATCM sends a message to the ABS module over the FD-CAN. The trail control is now engaged and the indicator is illuminated gray until the system is activated.

To activate, the trail control feature requires the following conditions to be met:

• Driver door is closed or the driver door is not present but the driver seatbelt is buckled.
• Parking brake is released.
• Vehicle speed is less than 31 km/h (20 mph) with the transfer case in high range.
• Vehicle speed is less than 15 km/h (10 mph) with the transfer case in low range.
• Vehicle speed is less than 8 km/h (5 mph) with the transmission in REVERSE.

Once activated, the trail control indicator turns green and vehicle speed is maintained at the set speed. The set speed can be increased or decreased using the plus and minus buttons on the steering wheel. Set speed may also be decreased using the brake pedal. When the brake pedal is pressed and released, the set speed matches the vehicle speed when the pedal is released. If the accelerator pedal is pressed, the vehicle accelerates normally and, once the pedal is released, the vehicle returns to the previously set speed.

The trail control feature transitions from active to enabled when any of the following occur:

• The CNCL-RES button is pressed.
• The transmission is shifted into PARK.

The trail control feature transitions from active to braking only when any of the following conditions are met:

• The driver door is opened or the driver door is not present and the driver seatbelt is unbuckled.
• The parking brake is applied.
• A substantial service brake pedal application occurs.

When any one of the above conditions are met, the trail control feature disables the driving torque and will only use brakes to control to the last known set speed. If the driving torque is disabled while descending or ascending an incline the trail control feature uses the ABS to apply to brakes and allow the vehicle to descend the incline.

Trail One Pedal Drive 

When the trail one pedal drive button on the ATCM is pressed, the module sends a message to the ABS module over the FD-CAN. The trail one pedal drive is now engaged and the indicator is illuminated gray until the system is activated.

When trail one pedal drive is active, the indicator displays green in the instrument cluster. When the system is on but is unavailable or in standby mode, it displays grey.

To activate, the trail one pedal drive feature requires the following conditions to be met:

• The transfer case is in 4WD HIGH or 4WD LOW.
• Cruise control is OFF.
• Trail control is OFF.
• Vehicle speed is less than 48 km/h (30 mph).

Once activated, the trail one pedal drive indicator turns green and the driver is able to accelerate and brake using only the accelerator pedal. The system assists when driving through difficult off-road terrain. Pressing the accelerator pedal down accelerates the vehicle and releasing pressure on the accelerator pedal, while still maintaining contact with the pedal, slows the vehicle down. Releasing the accelerator pedal completely allows the vehicle to come to a complete stop.

The following vehicle conditions exist while trail one pedal drive is active:

• Shifting the transmission into DRIVE or REVERSE does not cause the vehicle to move.
• The brake pedal can still be pressed to increase braking. This does not turn the system off.
• Trail one pedal drive may apply the parking brake if the vehicle is not moving and the transmission is not in PARK.

The trail one pedal drive feature transitions from active to OFF when any of the following conditions are met:

• The trail one pedal drive button on the ATCM is pressed again.
• Shifting the transfer case to a driveline mode other than 4WD HIGH or 4WD LOW.
• Vehicle speed exceeds 68 km/h (42 mph).

Pressing either the SET+ or SET- buttons while trail one pedal drive is active places the feature into standby mode and activates the trail control feature.

Trail Turn Assist 

Trail turn assist can reduce the turning radius of your vehicle by applying the brakes to the inside rear wheel in low-speed, high steering-angle maneuvers.

While in 4WD HIGH or 4WD LOW, press the trail turn assist button to activate the feature. When the trail turn assist switch is pressed, the driveline chassis switch module sends a trail turn assist switch signal message to the ABS module over the FD-CAN. Trail turn assist is on at this time but is not activated until:

• Vehicle speed is less than 19 km/h (12 mph).
• Rear differential is fully unlocked.
• Steering wheel is almost fully turned to the left or right.

Once the activation conditions are met, the ABS module applies brake pressure to the inside rear brake caliper until the activation conditions no longer apply.