Electronic brake control system
Your vehicle is equipped with an advanced electronic brake control system that includes Anti-Lock Brake Sys- tem (ABS), Traction Control System (TCS), Brake Assist System (BAS), and Electronic Stability Control (ESC). All systems work together to enhance vehicle stability and control in various driving conditions and are commonly referred to as ESC.
Anti-Lock Brake System (ABS)
This system aids the driver in maintaining vehicle control under adverse braking conditions. The system controls hydraulic brake pressure to prevent wheel lock-up and help avoid skidding on slippery surfaces during braking.
WARNING! The ABS cannot prevent the natural laws of physics from acting on the vehicle, nor can it increase the traction afforded by prevailing road conditions. The ABS cannot prevent collisions, including those re- sulting from excessive speed in turns, driving on very slippery surfaces, or hydroplaning. The capa- bilities of an ABS-equipped vehicle must never be exploited in a reckless or dangerous manner which could jeopardize the user’s safety or the safety of others.
Traction Control System (TCS)
This system 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 system functions similar 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.
Brake Assist System (BAS)
The BAS is designed to optimize the vehicle’s braking capability during emergency braking maneuvers. The system detects an emergency braking situation by sens- ing the rate and amount of brake application and then applies optimum pressure to the brakes. This can help reduce braking distances. The BAS complements the Anti-Lock Brake System (ABS). Applying the brakes very quickly results in the best BAS assistance. To receive the
benefit of the system, you must apply continuous brak- ing 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.
WARNING!
• The BAS cannot prevent the natural laws of phys-
ics 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.
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STARTING AND OPERATING 331
Electronic Stability Control (ESC)
This system enhances directional control and stability of the vehicle under various driving conditions. ESC cor- rects for over/under steering of the vehicle by applying the brake of the appropriate wheel to assist in counter- acting the over/under steer condition. Engine power may also be reduced to help the vehicle maintain the desired path. ESC uses sensors in the vehicle to deter- mine the vehicle path intended by the driver and com- pares 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. • Over-steer - when the vehicle is turning more than
appropriate for the steering wheel position. • Under-steer - when the vehicle is turning less than
appropriate for the steering wheel position.
WARNING! Electronic Stability Control (ESC) cannot prevent the natural laws of physics from acting on the vehicle, nor can it increase the traction afforded by prevailing road conditions. ESC cannot prevent accidents, in- cluding those resulting from excessive speed in turns, driving on very slippery surfaces, or hydro- planing. ESC also cannot prevent accidents resulting from loss of vehicle control due to inappropriate driver input for the conditions. Only a safe, attentive, and skillful driver can prevent accidents. The capa- bilities of an ESC equipped vehicle must never be exploited in a reckless or dangerous manner which could jeopardize the user’s safety or the safety of others.
332 STARTING AND OPERATING
ESC Operating Modes
The ESC system has two available operating modes:
Full On
This is the normal operating mode for ESC. Whenever the vehicle is started the ESC system will be in this mode. This mode should be used for almost all driving situa- tions. ESC should only be turned to “Partial Off” for specific reasons as noted below.
Partial Off
This mode is entered by momentarily pressing the “ESC Off” switch (located in the lower switch bank below the heater/air conditioning controls). 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, with the exception of engine power reduction. 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.
ESC Off Switch
WARNING! When in “Partial Off” mode, the TCS functionality 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. When in “Par- tial Off” mode, the engine power reduction of TCS is disabled, and the enhanced vehicle stability offered by the ESC system is reduced.
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 situa- tion requiring ESC to be switched to the “Partial Off” mode is overcome, turn ESC on again by momentarily pressing the “ESC Off” switch. This may be done while the vehicle is in motion.
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 cycled 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 autho- rized dealer as soon as possible to have the problem diagnosed and corrected.
The “ESC Activation/Malfunction Indicator Light” (lo- cated 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 ac- celeration, 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.
NOTE:
• The “ESC Off Indicator Light” and the “ESC Activation/Malfunction Indicator Light” come on momen- tarily each time the ignition switch is turned ON.
• Each time the ignition is cycled ON, the ESC system will be ON even if it was cycled 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 partially off.
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