This system is an extra driving aid. It does not replace your attention and judgment, or the need to apply the brakes. This system does NOT automatically brake your vehicle. If you fail to press the brake pedal when necessary, you may collide with another vehicle.
The Pre-Collision Assist system with brake support cannot help prevent all collisions. Do not rely on this system to replace your judgment and the need to maintain correct distance and speed.

Note:  The system does not detect, warn or respond to potential collisions with vehicles to the rear or sides of your vehicle.
Note:  The Pre-Collision Assist system is active at speeds above approximately 5 mph (8 km/h).
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The system alerts you of certain collision risks. The system's sensor detects your vehicle's rapid approach to other vehicles traveling in the same direction as your vehicle.
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When your vehicle rapidly approaches another vehicle, a red warning light flashes and a tone sounds.
The brake support system assists you in reducing any collision speed by pre-charging the brakes. If the risk of collision continues to increases after the audio-visual warning, the brake support prepares the brake system for rapid braking. The system does not automatically activate the brakes, but if the brake pedal is pressed even lightly, the brakes apply full stopping power.
Using the Pre-Collision Assist System
The Pre-Collision Assist system’s brake support reduces collision speed only if you brake your vehicle before any collision. As in any typical braking situation, you must press your brake pedal.

You can adjust the warning system's sensitivity through your information display. See  General Information
Note:  When possible, the manufacturer recommends using the highest sensitivity setting. If warnings are too frequent, you can reduce your system's sensitivity. Reduced sensitivity causes fewer and later system warnings. See  General Information
Blocked Sensors
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If a blocked sensor message appears in the information display, dirt, water, or an object is blocking the sensor. The sensor is located behind a cover near the driver side of the lower grille. If anything blocks the sensor, your vehicle cannot see through the sensor, and the pre-collision assist system will not work. Possible causes for the blocked sensor message and corrective actions are listed below.

Cause  Action 
The radar sensor cover in the grille is dirty or obstructed  Clean the radar sensor cover or remove the obstruction 
The surface of the radar sensor cover is clean but the message remains in the display  Wait a short time. The radar may take several minutes to reset after you remove the obstruction 
Heavy rain, spray, snow or fog in the air interferes with the radar signals  The Pre-Collision Assist system is temporarily disabled. Shortly after weather conditions improve, the collision warning system automatically reactivates 
Swirling water, snow or ice on the road surface interferes with the radar signals  The Pre-Collision Assist system is temporarily disabled. Shortly after weather conditions improve, the collision warning system automatically reactivates 

System Limitations
The Pre-Collision Assist system’s brake support only reduces collision speed if you first apply your brakes. You must brake as you would in any typical braking situation.

Due to the nature of radar technology, there may be certain instances where vehicles do not provide a collision warning. These include:
  • Stationary vehicles or vehicles moving below 6 mph (10 km/h).
  • Pedestrians or objects in the roadway.
  • Oncoming vehicles in the same lane.
  • Severe weather conditions (see blocked sensor section).
  • Debris build-up on the grille near the headlamps (see blocked sensor section).
  • Small distance to vehicle ahead.
  • Large steering wheel and pedal movements (very active driving style).
Damage to the front end of your vehicle may alter the radar sensor's coverage area. This may result in missed or false collision warnings. Have an authorized dealer check your radar sensor for proper coverage and operation.