A little while ago I noticed that I could not open the trunk of my 2011 Buick Regal CXL 2.4L, when manually using the touchpad and as such I am forced to use my remote. When booking my appointment to have this fixed, the dealership service rep stated that there is an issue with the touchpads. Hope this helps anyone else with the same issue:
#PI0185C: Intermittent Unwanted Liftgate or Trunk Opening, Liftgate or Trunk Inoperative, DTC B2494 or B3618 Set - (Dec 8, 2011)
Subject:Intermittent Unwanted Liftgate or Trunk Opening, Liftgate or Trunk Inoperative, DTC B2494 or B3618 Set
Models:2008-2012 Buick Enclave2010-2012 Buick LaCrosse2011-2012 Buick Regal2008-2012 Cadillac CTS2010-2012 Cadillac CTS Coupe, CTS Wagon, SRX2010-2012 Chevrolet Equinox2007-2012 GMC Acadia2010-2012 GMC Terrain2007-2010 Saturn OUTLOOKThis PI is being revised to add the 2012 model year and remove the Chevrolet Traverse. The Recommendation/Instruction information has also been updated. Please discard PI0185B.
Some customers may comment on any of the following conditions:
• Unwanted opening of the liftgate or trunk while the vehicle is parked and unlocked. If this condition occurs when the vehicle is locked, the liftgate or trunk will not open.• Liftgate or trunk will not open when pressing the touch pad (exterior release switch).The technician may determine that they are unable to duplicate these intermittent conditions. The vehicle may exhibit these conditions only when moisture is present at the rear liftgate or trunk release switch. The condition will most likely occur after the vehicle is exposed to rain, snow or a car wash.
These conditions may be caused by corrosion of conductive materials within the exterior release switch due to moisture and/or road salt. The corrosion may cause the switch resistance to be below the level necessary to activate the liftgate or trunk release. Severe corrosion may cause permanent increases in the resistance and cause the switch to become inoperative.
Important: DO NOT replace the latch assembly, striker, control module or wiring harness for this condition. DO NOT attempt to re-align the latch assembly or striker.
Install a scan tool and perform the Vehicle Diagnostic System Check. Retrieve and record any existing history or current DTCs from all of the control modules. Refer to SI.
• If any DTC(s) are set, diagnose and repair the condition that caused the DTC. Refer to SI.• If DTC(s) are not set, first verify that the other inputs (interior switch or remote transmitter) will open the liftgate or trunk. This will verify the latch and control functionally. If the other inputs function correctly, inspect the point where the wires enter the exterior liftgate or trunk release switch for corrosion. If corrosion is present or the switch resistance is below 100K ohms when it is not pressed, replace the exterior release switch.