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I have a 2007 Buick Rainier and started having problems about two weeks ago. First, What is the system that controls the tire pressure monitoring system (Not the individual tire pressure monitors)? I get a message in the Drivers information display that says "Service tire pressure monitoring system". Second (I think these are all related) I am having problems with the key less entry system. Sometimes the key fob opens/locks the doors and sometimes not. I have replaced batteries in both key fobs ans I still have the same symptoms. What system controls the keyless entry system? thire, What system controls the rear lift gate latch/lock/unlock functions? Sometimes they will unlock and sometimes they wont. Even the unlock switch on the drivers door will not unlock it sometimes. Also, when the liftgate does unlock and open, it seem to keep unlocking or locking itself as long as the liftgate is open. What controls all of they different functions?