You are going to have to get the latest calibrations and software downloaded into your door modules with a factory compatible scan tool to address and correct this issue, GM issued a technical service bulletin about promblems they are seeing relating to these park assist mirrors. I've posted it below for you.
A large number of mirrors are being returned through the Warranty Parts Center (WPC) with
customer comments of curb park assist and memory setting issues. Returned part analyses
indicate that the mirrors are found to be fully functional. If you have a memory or curb park assist
issue, check the wiring, the respective door module and the software calibrations prior to replacing
Subject: Information On Curb Park Assist And Memory Related Issues
On Outside Rear View Mirrors
Models: 2008 and Prior GM Passenger Cars and Trucks (Including
Saturn) (Excludes Cadillac SRX)
2008 and Prior HUMMER H2, H3
2007 and Prior Saab 9-7X
with Memory Mirrors
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform
these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the
proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how
to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or
that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit
from the information.
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Tuesday, March 1st, 2011 AT 3:05 AM