2009 Nissan Xterra Owner's Manual - Page 106

HORN The flashers will operate with the ignition switch placed in any position. Some state laws may prohibit the use of the hazard warning flasher switch while driving. VEHICLE DYNAMIC CONTROL (VDC) OFF SWITCH WIC1449 WIC0534 To sound the horn, push the area between the horn icons on the steering wheel. The vehicle should be driven with the Vehicle Dynamic Control (VDC) system on for most driving conditions. If the vehicle is stuck in mud or snow, the VDC system reduces the engine output to reduce wheel spin. The engine speed will be reduced even if the accelerator is depressed to the floor. If maximum engine power is needed to free a stuck vehicle, turn the VDC system off. To turn off the VDC system, push the VDC OFF switch. The indicator will come on. Push the VDC OFF switch again or restart the engine to turn on the system. See "Vehicle Dynamic Control (VDC) system" in the "Starting and driving" section. WARNING Do not disassemble the horn. Doing so could affect proper operation of the supplemental front air bag system. Tampering with the supplemental front air bag system may result in serious personal injury. 2-30 Instruments and controls