Sensors are not working. The lights still come on as normal but no sound. Also, I have checked that the button is not off. I did replace the shifter and that did not resolve the issue. Any help would be greatly appreciated!
Last edited by liquiddi; 03-31-2012 at 09:28 AM.
need a little more info;
YME (year, model, engine)?
OE or Mopar accessory kit?
yes 07 6.1 OEM back up sensors.
there is an audible tone transducer on the display's circuit board. if the LEDs operate as designed, the display module is recieveing the proper requests and actuating the appropriate LEDs but somehow, the tone transducer or it's circuit is defective. not repairable. must be replaced.
is that circuit board located at? Thank you!
it's inside the display.
really weird because the thing will beep if you are right on something. Do you know the part number by any chance that I need to order?
if it beeps at all, the tone transducer is OK.
intermittant audible tone is generated when detected object is within 30" (outboard red LEDs).
constant tone is generated when detected object is within 12" (inboard red LEDs).
will beep on the last light which is the red light. It will not beep on any of the yellows up to the red.
then, it's working as designed.
no it only beeps on the red. It used to beep on the yellows slowly up to the red when you would get a constant sound once you are right on top of something. Now you get no beeps on any of the yellow lights. It doesn't work right.
well, it's your car so i'll assume you know how it works. i'm just going by what the shop manual says. i'd be evaluating another similar jeep before coming to any conclusion.
PARK ASSIST SYSTEM
The park assist system is active only when the ignition switch is in the ON or START positions, the parking brake is released and the vehicle speed is less than 16 kilometers-per-hour (10 miles- per-hour). In addition, the rear park assist system is active only with the manual or automatic transmission gear selector lever in the REVERSE position, while the front park assist system is only active with the automatic transmission gear selector lever in the DRIVE or REVERSE position or with the manual transmission selector lever in any position except REVERSE. In vehicles equipped with this option, the system is enabled from the factory as a default. Both systems can be manually disabled in unison by the vehicle operator using the park assist switch integral to the lower instrument panel switch pod. If the vehicle operator does not want the system active, momentarily depressing the park assist switch OFF button will disable the system until the switch button is depressed again.
Reasons for disabling the system include trailer towing and off road use. With a trailer attached to the vehicle the audible and visible rear park assist alerts would be incessant whenever the gear selector lever was in the REVERSE or NEUTRAL positions due to the proximity of the trailer to the rear of the vehicle. Similarly, operating the vehicle off road may cause the front and rear park assist alerts to become distracting due to the proximity of large trees or boulders and the extreme approach angles that may be encountered while maneuvering on off road trails or terrain. When the system is disabled, a PARK ASSIST DISABLED textual message will appear in the instrument cluster reconfigurable dot matrix display whenever the gear selector lever is in any position in which the system is normally active. An amber Light Emitting Diode (LED) indicator in the park assist switch button will also be illuminated whenever the ignition switch is in the ON position and the system is disabled.
The microprocessor based park assist module is the central component of the park assist system. It supplies voltage to the park assist sensors and the park assist displays, receives and analyzes data from the sensors, calculates and communicates the proper display information to the park assist displays, performs system diagnostics, and communicates with other electronic modules in the vehicle or with a diagnostic scan tool over the Controller Area Network (CAN) data bus. The module operates on battery voltage received through a fuse in the Junction Block (JB), and is grounded through a take out and eyelet terminal of the underbody wire harness that is secured by a nut to a ground stud on the rear floor panel just outboard of the module mounting location.
Ultrasonic park assist sensors in the front or rear bumper fascia allow the park assist system to locate and identify the proximity of nearby obstacles. These sensors each generate ultrasonic sound pulses when triggered by the park assist module, then signal the module when an echo of the reflected sound pulses is received. The detection distance range from the front or rear of the vehicle is about 0.3 meters (11.8 inches) to about 1.5 meters (59.1 inches), and the detection height range from the ground is about 0.2 meters (7.8 inches) to about 0.8 meters (31 inches). The detection area extends somewhat around both sides (corners) of the vehicle.
The park assist display units provide the vehicle operator with both visible and audible warnings indicating the relative range of a detected object. The front display is visible to the vehicle operator while looking forward. The rear display is visible to the vehicle operator over an inboard shoulder as they look rearward while backing the vehicle up, but is not visible in a properly adjusted inside rear view mirror while looking forward. Each display contains two sets of eight Light Emitting Diode (LED) indicator units, one set dedicated to each side of the vehicle, and an audible chime tone transducer. The LED units are concealed beneath a smoked oval lens and are not clearly visible when they are not illuminated. When the park assist system is active and no obstacles are detected, the two outermost, amber LED units in the display are illuminated at a reduced intensity to provide visual confirmation that the system is operating.
Each display provides a visual indication of a detected object by illuminating one or more LED indicators, amber first followed by red, moving toward the center of the display as the vehicle gets closer to the object. As the vehicle comes to within about 40 centimeters (31 inches) of the object, 1 red LED is illuminated and the display emits a series of short, intermittent, audible beeps. If the audio system is turned ON, the audio output will be muted automatically while the park assist audible warning is being generated. The audible warning changes from intermittent beeps to a continuous tone as the final red indicators are illuminated on 1 or both sides of the display and the vehicle comes to within 30.5 centimeters (12 inches) of a detected object.
When the park assist module monitors a problem in any of the park assist system circuits or components, it stores a fault code or Diagnostic Trouble Code (DTC) in its memory circuit, illuminates all four red LED units in the park assist display, sends an electronic message to the instrument cluster, and a SERVICE PARK ASSIST SYSTEM textual message is displayed in the instrument cluster reconfigurable dot matrix display.
The hard wired circuits between components related to the park assist system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.
However, conventional diagnostic methods will not prove conclusive in the diagnosis of the park assist system or the electronic controls or communication between modules and other devices that provide some features of the park assist system. The most reliable, efficient, and accurate means to diagnose the park assist system or the electronic controls and communication related to park assist system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.
Last edited by fnkychkn; 04-14-2012 at 11:31 AM.
The OEM system in my '05 300C works exactly the way the Fnky describes above. I've been in Fords where the back system starts beeping as soon as you throw it into reverse and I personally find it obnoxious. I think Chrysler did a great job with the backup sensors - very accurate and unobtrusive, only making noise (and muting the radio) if you're getting very close to an obstruction.
2005 300C Magnesium Pearlcoat
BBK 85mm TB, Volant CAI w/lower duct,
2006 TCM swap
DS Predator 91 CAI canned tune
Borla cat-back 140112
SRT struts/springs + Hotchkis sways
I'm not explaining it right. Basically this is how it works in my car. You start to back up and by the time you hit something it will start a solid beep. lol You have no warning beeps until you are about 1 inch from hitting anything. It used to beep about 4-6 feet from hitting something and they were slow beeps and got faster the closer you got to an object.