Normal operation

The ABS operates at speeds above 3 to 6 MPH (5 to 10 km/h).
When the ABS senses that one or more wheels are close to locking up, the actuator rapidly applies and releases hydraulic pressure. This action is similar to pumping the brakes very quickly. You may feel a pulsation in the brake pedal and hear a noise from under the hood or feel a vibration from the actuator when it is operating. This is normal and indicates that the ABS is operating properly. However, the pulsation may indicate that road conditions are hazardous and extra care is required while driving.
See also:
Lane Departure Warning (LDW)/Prevention (LDP) system (if so equipped)
The Lane Departure Warning (LDW) system/
Lane Departure Prevention (LDP) system
will operate when the vehicle is driven
at speeds of approximately 45 MPH (70
km/h) and above, and when it is tr ...
Shift lock release
Shift lock release
If the battery charge is low or discharged, the selector lever may not be moved from the P (Park) position even with the brake pedal depressed and the selector lever button pushe ...
Safety
As of this writing, the 2011 QX56 hasn't been crash-tested.
Standard safety features include front and side-impact airbags, side-curtain
airbags for all three rows, an electronic stability system ...
