Lucerne V6-3.9L (2009)
Parking Assist Control Module: Customer Interest
Parking Assist - Phantom Beep When Shifting Into Reverse
TECHNICAL
Bulletin No.: 09-08-55-003
Date: December 17, 2009
Subject: Unwanted Phantom Beep from Ultrasonic Park Assist When Shifting Into Reverse (Reprogram Object Alarm Module)
Models:
2009-2010 Buick Lucerne
Equipped with Rear Park Assist RPO UD7
2009-2010 Cadillac DTS
Equipped with Front/Rear Park Assist RPO UFR
Condition
Some customers may comment that at certain times, while in reverse gear, a driver may receive an alert warning from a "false detection" (a quick beep
with the rear yellow LED display lit momentarily) indicating the presence of an object in the ultrasonic park assist (UPA) sensors' field of view, when
in-fact there may not be any object present. The phantom beeps are usually random and at times can be prolonged.
Cause
This condition may be caused by the object alarm module software being unable to filter a possible object detected by the UPA sensors from external
environmental interference. The module incorrectly interprets UPA sensor data received as an object and incorrectly sends a warning alert for this false
detection.
Correction
Reprogram the object alarm module.
Important
Select the correct calibration files for the appropriate vehicle configuration (body style) and RPO codes.
A revised calibration has been developed to address this condition. Technicians are to reprogram the object alarm module using service programming
system (SPS) with the latest software available on TIS2WEB. Refer to Object Alarm Module Programming and Setup in SI.
When using a Tech 2(R) or a Multiple Diagnostic Interface (MDI) for reprogramming, ensure that it is updated with the latest software version.
During programming, the battery voltage must be maintained within the proper range of 12-15 volts. Only use the approved Midtronics(R) PSC 550
Battery Maintainer (SPS Programming Support Tool EL-49642) or equivalent during programming.
Warranty Information
For vehicles repaired under warranty, use the table above.
Disclaimer
