2016 Malibu Limited LS, Hi all, my Malibu was sorta a spare car and has had roughly 200 miles put on it since 2022. car has a total of 113,000 on it. I keep a battery maintainer on it. wife's Altima's transmission took a bowel movement. so, transferred tag to Malibu and getting it up and around as she is commuting with my HHR, my baby.. the Mailbu's radio, HVAC controls stopped working or lighting up or displaying. and the door lock switches on the door panels also stopped working at the same time. the radio still plays and the volume and tuner controls on the steering wheel still works the radio. Radio control panel does nothing. the door locks, all work with my FOB, the on star works, I can command All components of the HVAC system to work with my scanner. I took it to the dealer as they still have it. last night I was thinking, the car has been sitting with a battery maintainer on it. Im now wondering if the Auxiliary battery in trunk is dead, it's 1 year old but not sure if it's staying maintained with just the charger hooked to the main battery under hood. if it is dead, would it have effect on my Electronics in the car?? my scanner also pulls codes from the HVAC module, says it cannot find a program (software).. so this is the reason I took it to the dealer to see if a program is what it needs. they will be looking at it this monday. but.. will a dead Auxiliary battery cause the electronics problem??.Im a pretty good size dude, getting in and out of this Malibu is breaking my back and neck ,can't hardly get in & out of it. I want my HHR back and wife into her new car, the Malibu as I retire the Nissan to the great metal recycler in China