Accoustic park assist makes long beep rather than beep beep

Question about 2004 Ford Expedition
1 Answer
I own an 05 Expedition with rear park assist. The system appears to be working, minus the actual alert sound. If I back up with the radio on, the radio will automatically lower the volume as normal so the audible "beeps" will be easily heard. There appears to be a TSB regarding the issue I described, the fix is to first replace the speaker that is attached to the module. Cheap enough to try, about $35 bucks. I have no idea where the module/speaker is located.
Posted by Peanut12 on Oct 21, 2013
This answer was posted on fixya previously. So check for a TSB on your vehicle.

Check with a diagnostic scan tool for module fault codes and sensor fault codes. If nothing comes back complete electrical circuit prove out.

any ASE shop can fix cars , dealers are not god.

you can disable it, its in the oper guide how.

your problem is most likely the brake assist pump or controler

your sensors are faulty

where is the parking assist sensor??

Rear parking assist, the beep lets you know how close you are.

first try backing up close(6ins) to a wall then put car in reverse(sensors are powered by reverse lights circuit)see if it makes a noise when you press on/off button.if no then make sure you have reverse bulbs working,then check fuses.

Take it back to the dealer. There is a Technical Service Bulletin on the wiring for the Park Assist.

Broken wires to the sensors. Common problem.
Rewire the faulty one(s) and you are good to go