Expedition 4WD V8-5.4L SOHC VIN 5 (2005)
Parking Assist Distance Sensor: Customer Interest
Instruments - False Parking Aid Warnings
TSB 05-6-4
04/04/05
FALSE PARKING AID WARNINGS
FORD:
2005 Five Hundred, Freestyle
2002-2003 Windstar
2002-2005 Excursion, Expedition, Explorer,
F-Super Duty
2003-2005 Escape
2004-2005 F-150, Freestar
LINCOLN:
2002 Navigator
2002-2003 Blackwood
2003-2005 Aviator
MERCURY:
2005 Montego
2002-2005 Mountaineer
2004-2005 Monterey
2005 Mariner
This article supersedes TSB 05-4-19 to update the description for labor operation F.
ISSUE
Vehicles equipped with the parking aid reverse sensing system (RSS) may sound a warning tone when the vehicle is in reverse, even though there are no
objects behind the vehicle. This condition may also occur on vehicles equipped with the forward sensing system (FSS) when vehicle is in reverse or
drive.
ACTION
The condition MAY NOT be due to proximity sensor(s) malfunction but may be a normal operation characteristic, or due to sensor contamination
(sensor being covered with dirt). Refer to the following description of OPERATION AND COMMON CAUSE OF WARNINGS, before replacing any
sensor(s).
SERVICE PROCEDURE
NOTE
THE FOLLOWING DESCRIPTIONS ARE TRUE FOR BOTH THE RSS AND FSS.
OPERATION AND COMMON CAUSE OF WARNINGS
The RSS is only operational when the vehicle is in reverse. For vehicles also equipped with the FSS the system is operational when the vehicle is in
reverse or drive. The FSS and RSS give an audible warning to the driver when obstacles are within 6' (1.8 meters) from the vehicle, and when obstacles
are within 18" (46 cm) on either side of the bumper.
NOTE
CERTAIN OBSTACLES MAY BE DIFFICULT FOR THE RSS/FSS TO DETECT DEPENDING ON GEOMETRIC SHAPE OR PROFILE OF
THE OBJECT AND THE MATERIAL THE OBJECT IS COMPOSED OF.
NOTE
THE NEAREST OBSTACLE WILL ALWAYS BE THE OBSTACLE REPORTED, WITH THE EXCEPTION STATED IN THE NOTE ABOVE.
NOTE
THE VEHICLE OPERATOR MUST BE AWARE THAT THE WARNING TONES ARE AT A MODERATE VOLUME LEVEL AND THAT
THE TONES MAY BE DIFFICULT TO HEAR WITH BACKGROUND NOISE (RADIO, BLOWERS, PASSENGER CONVERSATION, ETC).
THE RSS/FSS SPEAKER VOLUME IS ALREADY AT MAXIMUM VOLUME AND IS NOT ADJUSTABLE.
In cases where the RSS/FSS give warnings but nothing is within range of the vehicle sensors, or give warnings for 3 seconds then ceases, the occurrence
may be due to any of the following reasons:
