Park Assist Off Message Displayed On DIC (Reprogram Object Alarm Module) (09-08-49-009B)

WARNING: This page is about the Lucerne CX, 3.9 1, which is a different variant/trim than selected.

Publication date: 2011-03-22
Reference number: 09-08-49-009B
Supersedes refnos: 09-08-49-009, 09-08-49-009A

PARK ASSIST OFF MESSAGE DISPLAYED ON DIC (REPROGRAM OBJECT ALARM MODULE)

TECHNICAL SERVICE BULLETIN

Reference Number(s): 09-08-49-009B, Date of Issue: March 22, 2011

Affected Model(s):	2009 Buick Lucerne; Built Prior to VIN Breakpoint 9U143451; Equipped with Rear Park Assist RPO UD7; 2009 Cadillac DTS; Built Prior to VIN Breakpoint 9U144155; Equipped with Front and Rear Obstacle Detection RPO UFR
Supercedes:	This bulletin is being revised to update the Condition/Cause/Correction information. Please discard Corporate Bulletin Number 09-08-49-009A (Section 08 - Body and Accessories).

Superceded Bulletin(s): 09-08-49-009A, Date of Issue: December 17, 2009

CONDITION

A customer may comment on a "Park Assist Off" message displayed on the driver information center (DIC).

CAUSE

This condition may be caused by obstructions/damage in the area of the sensors or an object alarm module software/calibration anomaly.

CORRECTION

IMPORTANT: DO NOT replace the object alarm module for this concern.

For a "Park Assist Off" DIC message, follow the steps below:

With the ignition ON, verify the park assist system is enabled through the DIC.
If the park assist system is manually disabled, enable the system. No further repairs are necessary.
Inspect the vehicle for the following reasons that may have caused the "Park Assist Off" message to appear. If any concerns are found, proceed to Step 3. If none are found, proceed to Step 5.
- One or more of the sensors may be blocked by snow, mud, ice, or other debris. This might happen after going through a car wash in cold weather.
- The silicone insulator surrounding the sensor maybe missing, cut or twisted.
- Improperly installed sensor. The sensor may be crooked due to a tight wire harness.
- One or more of the sensors may be scratched or the paint may be chipped.
- Excessive paint thickness on a sensor may cause a "Park Assist Off" message. When replacing or refinishing a sensor, do not apply an excessive amount of paint or clear coat.
- Common items such as a hitch receiver, trailer, object hanging out of rear compartment, or a bicycle rack.
- Damage to the front (DTS only) or rear of the vehicle or a misaligned sensor.
- Incorrect front license plate bracket or front license plate outside of bracket.
- The vehicle has traveled too fast in reverse at speeds of greater than 8 km/h (5 mph).
If any of the above issues are discovered, correct the issue and drive the vehicle in a forward direction at a speed greater than 40 km/h (25 mph).
After driving the vehicle greater than 40 km/h (25 mph), put the vehicle in Reverse and use a scan tool to verify the scan tool park assist system status parameter is listed as "Enable".
- If the parameter is listed as "Enable," the system is operating correctly and no further repairs are required.
- If the parameter is listed as "Disable," proceed to Step 5.
Reprogram the object alarm module. Refer to Reprogram Object Alarm Module below.

Reprogram Object Alarm Module

Reprogram the object alarm module with the latest software calibration.

IMPORTANT: Select the correct calibration files for the appropriate vehicle configuration (body style) and RPO codes.

A revised calibration and software have been developed to address this condition. Technicians are to reprogram the object alarm module using the Service Programming System (SPS) with the latest software available on TIS2WEB. Refer to the Object Alarm Module Programming and Setup in SI.

When using a Tech 2® 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® PSC 550 Battery Maintainer (SPS Programming Support Tool EL-49642) or equivalent during programming.

WARRANTY INFORMATION

For vehicles repaired under warranty, use:

Warranty Information

Labor Operation	Description	Labor Time
R9759*	Object Alarm Module Reprogramming	0.4 hr
*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.