I have a 94 f150. It is making a beeping noise. It is a series of 5 beeps pause 5 beeps pause 5 beeps. This is in addition to the standard door chime/key in ignition/lights on variety that normally occurs. both horn and cruise are not functioning so this makes me think it is a warning tone and can easily be fixed. all other features work properly ( lights radio heater/ac wipers etc ) Any ideas?