Air Bag On-off Switch problems of the 2008 Nissan Armada

9/22/09 - airbag light staying on - dealer found code b1034 "crash zone unit fail", found short circuit inside crash zone sensor, replaced crash zone sensor, cleared code. 9/29/09 - airbag light on again - dealer found code b1034 again - crash zone sensor failed. Found short circuit in air bag diagnostic unit - removed center console and replaced air bag diagnosis control unit, cleared codes. 10/23/09 - airbag light on again - dealer once again found code b1034 - called Nissan tech support, spoke with someone named mike. Was advised to replace both the engine harness and the main harness, removed steering wheel and steering shaft, removed center console, removed glove box, removed dash, and removed crossbar, installed new main harness, installed new engine harness, performed front end alignment because steering wheel and column were removed. Found open circuit in wire of the main harness, cleared code. Not sure if related but at the same time the sunroof switches starting working backwards and not opening automatically so reinitialized sunroof. 1/23/10 - airbag light on again - replaced bulb sept 2014 - airbag light on again - dealer found code b1034 again!!! short in crash zone sensor - replaced sensor - cost $487. 72 at what point does Nissan accept responsibility for the defect??? in addition to above, have had issues with the battery not lasting more than 2. 5 years. I just replaced it for the 3rd or 4th time in 2012 and am told that it is drained and I need another one?? related? I think so. Brakes - I've seen numerous complaints about people pressing down the brakes and having them not work and they make a grinding sound and vibrate. I've experienced this twice but the dealer says they can't find anything wrong??.