2007 Nissan Altima Owner's Manual - Page 133

The hazard warning lights will flash once and the horn will sound once to confirm that the horn beep feature has been reactivated. Deactivating the horn beep feature does not silence the horn if the alarm is triggered. stolen, a chime or buzzer sounds from inside and outside the vehicle and a warning is displayed in the instrument panel. When a chime or beep sounds or a warning is displayed, be sure to check the vehicle and the Intelligent Key. See the troubleshooting guide that follows and "Vehicle information display indicator lights and warnings" in the "Instruments and controls" section. TROUBLESHOOTING GUIDE Verify the location of all Intelligent Keys that are programmed for the vehicle. If another Intelligent Key is in range or inside the vehicle, the vehicle system may respond differently than expected. WARNING SIGNALS To help prevent the vehicle from moving unexpectedly by erroneous operation of the Intelligent Key or to help prevent the vehicle from being Pre-driving checks and adjustments 3-15