Why can't the Mercedes-Benz car door be opened from the inside but can be opened from the outside?
3 Answers
Mercedes-Benz car door cannot be opened from the inside but can be opened from the outside because the child lock is activated. The car child lock, also known as the door lock child safety mechanism, is set on the rear door lock of the car. After opening the rear door, there is a small lever (safety mechanism) below the door lock. Move the lever toward the end with the child icon, then close the door. At this point, the door cannot be opened from the inside and can only be opened from the outside. Taking the Mercedes-Benz E-Class 2021 E260L as an example: its length, width, and height are 5078mm, 1860mm, and 1484mm respectively, with a wheelbase of 3079mm. It is equipped with a 9-speed automatic transmission and has a top speed of 230 kilometers per hour.
Last time I encountered this issue, I was really anxious, feeling like the door lock was deliberately working against me. Later, I asked a knowledgeable friend, and he said many Mercedes models have a child lock design, especially for the rear doors. It's very likely that the small switch was accidentally triggered—there's a little toggle mechanism on the side of the door. If a child sits in the back or something brushes against it, the lock activates. Don’t rush to the repair shop just yet; try finding the child lock lever yourself and toggle it back to the unlocked position. Another possibility is that the cable connecting the interior door handle to the lock cylinder has come loose. Normally, pulling the handle too hard can cause the clip to detach, making the interior handle unresponsive while the mechanical key still works from the outside. In this case, you’ll need to remove the door panel to re-secure the cable, which costs around a hundred bucks at a repair shop. Lastly, it’s a good idea to have the mechanic check the door lock mechanism during regular maintenance to avoid unexpected issues.
This issue has been discussed several rounds in the Mercedes-Benz owner groups. The key is identifying which door has the problem. For rear doors, 99% of cases involve the child safety lock being activated - that silver switch hidden along the door edge often gets accidentally triggered during car washes or when children are seated. Front door issues are more complex, possibly caused by electronic glitches in the lock module, especially in keyless entry models where water damage to the control module can create such strange symptoms. Another possibility is a broken door check spring jamming the interior handle mechanism. Solutions vary: child locks can be manually reset; electronic issues require diagnostic computer reset; mechanical failures need spring replacement costing around 200-300 RMB. Remember to regularly clean door drainage holes to prevent water accumulation damaging components.
