Traction Control System (TCS) – If Equipped
The TCS monitors the amount of wheel spin of each of the driven wheels. If wheel spin is detected, brake pressure is applied to the slipping wheel(s), and engine power is reduced to provide enhanced acceleration and stability. A feature of the TCS functions similarly to a limited-slip differential and controls the wheel spin across a driven axle. If one wheel on a driven axle is spinning faster than the other, the system will apply the brake of the spinning wheel. This will allow more engine torque to be applied to the wheel that is not spinning. This feature remains active even if TCS and ESC are in the “Partial Off” mode. Refer to “Electronic Stability Control (ESC)” in this section of this manual. This brake pressure modulation transfers drive torque from slipping to non-slipping wheels to provide optimal forward traction.
Brake Assist System (BAS) – If Equipped
The BAS is designed to optimize the vehicle’s braking capability during emergency braking maneuvers. The BAS detects an emergency braking situation by sensing the rate and amount of brake application and then applies optimum pressure to the brakes. The system applies optimum pressure to the brakes in emergency braking conditions. This can help reduce braking distances. The BAS complements the ABS. Applying the brakes very quickly results in the best BAS assistance. To receive the benefit of BAS, you must apply continuous braking pressure during the stopping sequence. Do not reduce brake pedal pressure unless braking is no longer desired.
Once the brake pedal is released, the BAS is deactivated.
- The BAS cannot prevent the natural laws of physics from acting on the vehicle, nor can it increase braking efficiency beyond that afforded by the condition of the vehicle brakes and tires or the traction afforded.
- The BAS cannot prevent collisions, including those resulting from excessive speed in turns, following another vehicle too closely, or hydroplaning.
- The capabilities of a BAS-equipped vehicle must never be exploited in a reckless or dangerous manner which could jeopardize the user’s safety or the safety of others.
Hill Start Assist (HSA) – If Equipped
The HSA system is designed to assist the driver in launching a vehicle on an incline. HSA will maintain the level of brake pressure the driver inputs for a short duration once the driver takes his foot off of the brake pedal. If the driver does not apply the throttle during this short duration, the system will release brake pressure and the vehicle will roll down the incline. The system will release brake pressure in proportion to the amount of throttle applied.
During operation, HSA will activate the brake control system and a clicking noise may occur. If your foot is on the brake pedal during operation you may feel a slight pedal movement. The clicking and pedal movement is normal and both will stop when HSA becomes inactive.
HSA Activation Criteria
The following criteria must be met in order for HSA to activate:
Warning!There may be situations on minor hills (i.e., less than 7%), with a loaded vehicle or while pulling a trailer where the system will not activate and slight rolling may occur, which could cause a collision with another vehicle or object. Always remember the driver is responsible for braking the vehicle.
- Vehicle must be stopped
- Vehicle must be on a 7% or greater incline
- Gear selection matches vehicle uphill direction (i.e., vehicle facing uphill is in forward gear; vehicle backing uphill is in REVERSE gear).
The system will only work if the intended direction of the vehicle and vehicle gear match. For example, if the intended direction is forward up a hill and the vehicle is in DRIVE and the activation criteria are met, HSA will activate.
The system will work in REVERSE and all forward gears, and will not activate if the vehicle is placed in NEUTRAL.
Towing and Hauling with HSA
The HSA system does not know if your vehicle is loaded or towing a trailer unless the TOW/HAUL switch, located on the center stack, is selected. When activated, the “TOW/HAUL Indicator Light” will illuminate in the instrument cluster. Refer to “Automatic Transmission” in “Starting and Operating” for further information. In order to accommodate the extra weight entailed under towing and hauling conditions and to increase driver comfort while launching on a hill, the system recognizes when the TOW/HAUL switch is activated and compensates by releasing brake pressure at a slower rate while throttle is applied in order to prevent the vehicle from rolling down the hill.
Non-EVIC Equipped Vehicles
- If you use a trailer brake controller with your trailer, your trailer brakes may be activated and deactivated with the brake switch. If so, when the brake pedal is released, there may not be enough brake pressure to hold the vehicle and trailer on a hill and this could cause a collision with another vehicle or object behind you. In order to avoid rolling down the incline while resuming acceleration, manually activate the trailer brake or apply more vehicle brake pressure prior to releasing the brake pedal. Always remember the driver is responsible for braking the vehicle.
- HSA is not a parking brake. If you stop the vehicle on a hill without putting the transmission in PARK or using the parking brake, it will roll down the incline and could cause a collision with another vehicle or object. Always remember to use the parking brake while parking on a hill and that the driver is responsible for braking the vehicle.
If you wish to turn off the HSA system, follow this procedure:
EVIC Equipped Vehicles
- Start with the engine OFF, and the vehicle in PARK with the wheels straight.
- Start the engine.
- With the engine running and the brake applied, rotate the steering wheel 180° counterclockwise from center.
- Press the “ESC Off” switch four times within 20 seconds. The “ESC Off Indicator Light” should appear and disappear four times.
- Rotate the steering wheel 360° clockwise (180° clockwise from center).
- Cycle ignition switch OFF then ON.
- If the sequence was completed properly, the “ESC Off Indicator Light” will blink several times to confirm HSA is off. Steps 1 through 7 must be completed within 90 seconds to turn off HSA. Repeat steps 1 through 7 to re-enable HSA functionality.
HSA is a Customer Programmable Feature on a EVIC equipped vehicle. If you wish to turn off the HSA feature, refer to “Electronic Vehicle Information Center (EVIC)/Customer Programmable Features” in “Understanding Your Instrument Panel” for further information.
Electronic Stability Control (ESC) – If Equipped
The ESC system enhances directional control and stability of the vehicle under various driving conditions. ESC corrects for oversteering or understeering of the vehicle by applying the brake of the appropriate wheel to assist in counteracting the oversteer or understeer condition. Engine power may also be reduced to help the vehicle maintain the desired path.
ESC uses sensors in the vehicle to determine the vehicle path intended by the driver and compares it to the actual path of the vehicle. When the actual path does not match the intended path, ESC applies the brake of the appropriate wheel to assist in counteracting the oversteer or understeer condition.
All Two-Wheel Drive Vehicles and Four-Wheel Drive Vehicles in 2WD, 4WD AUTO, or 4WD LOCK Modes Can Choose the Following ESP Operating Modes:
- Oversteer - when the vehicle is turning more than appropriate for the steering wheel position.
- Understeer - when the vehicle is turning less than appropriate for the steering wheel position.
This is the normal operating mode for ESC in 2WD/4WD AUTO/4WD LOCK modes and in 2WD vehicles. Whenever the vehicle is started or the transfer case (if equipped) is shifted from 4WD LOW or Neutral, back to 4WD LOCK or 4WD AUTO, the ESC system will be in this mode. This mode should be used for almost all driving situations. ESC should only be turned to “Partial Off” or “ESP Off” for specific reasons as noted below.
ESC Partial Off
This mode is entered by momentarily pressing the “ESC Off” switch. When in "Partial Off" mode, the TCS portion of ESC, except for the “limited slip” feature described in the TCS section, has been disabled and the "ESC Off Indicator Light" will be illuminated. All other stability features of ESC function normally. This mode is intended to be used if the vehicle is in deep snow, sand, or gravel conditions and more wheel spin than ESC would normally allow is required to gain traction. To turn ESC on again, momentarily press the “ESC Off” switch. This will restore the normal “ESC On” mode of operation.
Note: To improve the vehicle's traction when driving with snow chains or starting off in deep snow, sand or gravel, it may be desirable to switch to the “Partial Off” mode by pressing the “ESC Off” switch. Once the situation requiring ESC to be switched to the “Partial Off” mode is overcome, turn ESC back on by momentarily pressing the “ESC Off” switch. This may be done while the vehicle is in motion.
Warning!In the “Partial Off” mode, the engine torque reduction and stability features are desensitized. Therefore, the enhanced vehicle stability offered by ESC is unavailable.
All Four-Wheel Drive Vehicles in 4WD AUTO and 4WD LOCK Modes Can Also Choose the Following ESC Operating Mode. This is the Only ESC Operating Mode in 4WD LOW:
This mode is intended for off-road use when ESC stability features could inhibit vehicle maneuverability due to trail conditions. This mode is entered by pressing and holding the “ESC Off” switch for five seconds when the vehicle is stopped and the engine is running. After five seconds, the “ESP Off Indicator Light” will illuminate and the “ESC Off” message will appear in the odometer. Press and release the trip odometer button located on the instrument cluster to clear this message.
Note: The “ESC OFF” message will display and the audible chime will sound when the shift lever is placed into the PARK position from any other position and then moved out of the PARK position. This will occur even if the message was previously cleared.
In this mode, ESC and TCS except for the “limited slip” feature described in the TCS section are turned off until the vehicle reaches a speed of 40 mph (64 km/h). At 40 mph (64 km/h) the system returns to “Partial Off” mode, described above. When the vehicle speed drops below 35 mph (56 km/h) the ESC system shuts off. ESC is off at low vehicle speeds so that it will not interfere with off-road driving but ESC function returns to provide the stability feature at speeds above 40 mph (64 km/h). The “ESC Off Indicator Light” will always be illuminated when ESC is off. To turn ESC on again, momentarily press the “ESC Off” switch. This will restore the normal “ESC On” mode of operation.
“ESC Off” is the only operating mode for ESC in 4WD LOW. Whenever the vehicle is started in 4WD LOW or the transfer case (if equipped) is shifted from 4WD LOCK or NEUTRAL, to 4WD LOW, the ESC system will be in this mode.
Warning!With the ESC switched off, the enhanced vehicle stability offered by ESC is unavailable. In an emergency evasive maneuver the ESC system will not engage to assist in maintaining stability. “ESC Off” mode is intended for off-highway or off-road use only.
ESC Activation/Malfunction Indicator Light and ESC OFF Indicator Light
The “ESC Activation/Malfunction Indicator Light” in the instrument cluster will come on when the ignition switch is turned to the ON position. It should go out with the engine running. If the “ESC Activation/Malfunction Indicator Light” comes on continuously with the engine running, a malfunction has been detected in the ESC system. If this light remains on after several ignition cycles, and the vehicle has been driven several miles (kilometers) at speeds greater than 30 mph (48 km/h), see your authorized dealer as soon as possible to have the problem diagnosed and corrected.
The “ESC Activation/Malfunction Indicator Light” (located in the instrument cluster) starts to flash as soon as the tires lose traction and the ESC system becomes active. The “ESC Activation/Malfunction Indicator Light” also flashes when TCS is active. If the “ESC Activation/Malfunction Indicator Light” begins to flash during acceleration, ease up on the accelerator and apply as little throttle as possible. Be sure to adapt your speed and driving to the prevailing road conditions.
- The “ESC Activation/Malfunction Indicator Light” and the “ESC OFF Indicator Light” come on momentarily each time the ignition switch is turned ON.
- Each time the ignition is turned ON, the ESC system will be ON even if it was turned off previously.
- The ESC system will make buzzing or clicking sounds when it is active. This is normal; the sounds will stop when ESC becomes inactive following the maneuver that caused the ESC activation.
The “ESC OFF Indicator Light” indicates the Electronic Stability Control (ESC) is off.
Trailer Sway Control (TSC) – If Equipped
The TSC system uses sensors in the vehicle to recognize an excessively swaying trailer and will take the appropriate actions to attempt to stop the sway. The system may reduce engine power and apply the brake of the appropriate wheel(s) to counteract the sway of the trailer. TSC will become active automatically once an excessively swaying trailer is recognized. No driver action is required. Note that TSC cannot stop all trailers from swaying. Always use caution when towing a trailer and follow the trailer tongue weight recommendations. Refer to “Trailer Towing” in “Starting and Operating” for further information. When TSC is functioning, the “ESP Off Indicator Light” will flash, the engine power may be reduced and you may feel the brakes being applied to individual wheels to attempt to stop the trailer from swaying. TSC is disabled when the ESC system is in the “Partial Off” or “Full Off” modes.
TSC is only active in the default “ESC On” mode. TSC can be disabled by pressing the “ESC Off” switch and entering “ESC Partial Off” mode. It is not active in the “ESC Partial Off” or “ESC Off” modes. Refer to the ESC portion of this section for an explanation of the different ESC operating modes.
Warning!If TSC activates while driving, slow the vehicle down, stop at the nearest safe location, and adjust the trailer load to eliminate trailer sway.