Here is a note from the GM tech link.
http://sandyblogs.com/techlink/wp-content/uploads/2012/06/June-Techlink-2012-F.pdf
Memory Seats Lose the Stored Position
On some 2010-2012 LaCrosse (with memory
seat, RPO A45), 2010-2012 SRX (with memory driver convenience package, RPO AAB), 2010-2012 Equinox LTZ, and 2010-2012 Terrain SLT models,
the memory
seat may not return to the stored position
when recalling it from the exit position, or it may lose the memory settings.
TIP: Generally, the condition is noticed after multiple operations, making the condition
perceived as intermittent.
First, verify the Memory Recall feature is being used correctly. Refer to the current version of #PIT4913 (Memory Seat Recall Inoperative from Key Fob) before proceeding
with the following steps.
Unlock the vehicle with the key fob button and turn the ignition to the Run position. Move the seat to the preferred customer driving
position. Visually determine the seat location by using a focal reference point or measurement tool.
Turn the ignition to Off to save the current seat position as the memory position for the current key fob. If the driver’s door is already open, the seat will move to the Easy Exit position. If the driver’s door is closed, open it to activate the Easy Exit feature.
While leaving the driver’s door open, cycle the seat between the key fob memory position
by pressing the unlock button on the key fob and the Easy Exit position by turning the ignition to Run and then to Off.
Perform this test up to 10 times. End at the same stored seat driving
position. If the seat position appears to have moved forward or rearward in the vehicle (in some cases up to 1/2 inch), new software is available for the Memory Seat Module (MSM).
TIP: For the Equinox LTZ and Terrain SLT models only, in TIS2Web, after selecting
MSM from the Module List, the Vehicle
Options drop-down list will come up. Select Heated Seats (+KA1). For all other models, select the appropriate options
listed using the RPO list. Under the Calibrations Tab, use the current TIS2Web Calibration identified as “New software to address customer complaints related to drifting memory position or loses memory position.” Thanks to Ernest Haller