What is the reason why the right rear door of a Mercedes-Benz cannot be opened from the inside?
2 Answers
The reason why the right rear door of a Mercedes-Benz cannot be opened from the inside: the child safety lock is engaged. There is a switch on the door frame edge; flipping it will resolve the issue. The child safety lock is an active safety device designed to ensure the safety of child passengers, preventing the danger of children accidentally opening the door from the inside while the vehicle is in motion. When the child safety lock is engaged, even if the central locking system is electronically unlocked, the child safety device remains locked, and the door can only be opened from the outside. The Mercedes-Benz C260 is a B-segment sedan under the Mercedes-Benz brand. Taking the 2021 C260 Star Edition as an example, its body dimensions are 4704mm in length, 1810mm in width, and 1454mm in height, with a wheelbase of 2840mm. In terms of power, the 2021 C260 Star Edition is equipped with a 1.5T turbocharged engine plus a 48V mild hybrid system, delivering a maximum power of 135 kW and a maximum torque of 280 N·m.
I had the same issue with my Mercedes-Benz E-Class where the right rear door couldn't be opened from the inside. After struggling for a while, I realized the child lock wasn't turned off. This design is located right by the door frame edge and is easy to miss unless you look carefully. It can accidentally get triggered during car washes or when transporting kids. Once when picking up my son from school, he kept frantically knocking on the door - turns out my dad had activated the child lock. Now whenever a door won't open, my first instinct is to check that little toggle switch on the door frame side. Besides this, other possible causes could be loose cables inside the door panel or aged/broken plastic clips, especially in older models after prolonged use. If it's really a cable issue, replacing it yourself is quite troublesome as you'd need to remove the door panel - better to let the 4S店 handle it.
