One problem related to front seat head restraint has been reported for the 2014 Mercedes Benz GL450. The most recently reported issues are listed below.
To the best of my knowledge - certain high end gl model have optional easy third row entry. The second row in such models folds with a touch of a button. However when fully deployed - the second row seat's head rest in such models prevent proper installation of kid's carseat � such that the upper part of the carseat is projected forward. I am 6 feet and can easily put the whole of my forarm behind my kid's carseat after installation. The result is � a very uncomfortable forward positioning of the kid's carseat. My kid has reported neck sprain multiple times. The issue does not resolve with using a booster only (without backrest) or with car's headrest not deployed � as in all situations the car's head rest still pushes my kid's head forward. I believe that it's a potential safety issue as well. This issue has been widely reported online. I guess mercedes took note of it and as per the local dealer - they have fixed it in the newer models (2016 onwards). In order to fix mine - my first plan was to remove the second row headrest (the one on which I install my kid's carseat). Dealer told me that it's not possible - and instead recommended a retrofit. Quote was $1300. Given that it's primarily a manufacturing defect I called mercedes USA - they replied promptly. Basically acknowledged that there is an issue and offered me $350 in service credit, but expected me to shell out the remaining $ 950 out of my pocket. When I told them that it's unfair to do so � as it's primarily a manufacturing defect � the agent basically told me that I should instead be happy that there's a remedy available and that also at my local mercedes dealer. He tried to use my current mileage (62k) as a justification for not picking up the cost - even though this has nothing to do with mileage and my vehicle has an unlimited mileage warranty until 08/2020.