Side/window Air Bag problems of the 2009 Chevrolet Express 1500

I'm from an independent repair shop. I have recently had problems with this 2009 express van. It has for no reason that I can tell. Deployed the side air bags while backing the vehicle up a driveway @ less than 5 mph. To give you a little history about the vehicle. The customer purchased the vehicle from a used car dealer approximately 6 month ago. The first problem with the vehicle was with the stabi-trac & reduced power light came on . We hooked up are tech-2 scan tool an retrieved the codes an diagnosed the problem with the steering wheel position sensor and the throttle position sensor. We repair those issues and sent it on. A little over a month latter the customer was driving the vehicle down a paved road @ 50- 55 mph on a near straight away. And it deployed the side air bags & seat belt pretensioners . The customer got it repaired at a body shop which replaced side air bags, seat belt pretenioners, side impact sensors & air bag module. Now roughly a week later it deployed the side airbags again while backing up a driveway in reverse to pickup his wife. I have the vehicle now and retrieved the codes ( b0052/ b0023 / b0022 / b0016 / b015 / b0090-71 ) does gm have problems with this type of vehicle? and I'm wondering can a rollover sensor malfunction an cause this to happen. Going by the code b0090 I have removed the carpet on the vehicle and found moisture under the carpet next to the rollover sensor. I removed it and found no corrosion at the wiring or connector. And the modules is a sealed module. Can anybody pull the crash data out of the airbag module so I can tell what parts are all need to be replaced. Any incite would be appreciated. Thanks in advance.