The rear seat backrests may fold forwards when you are driving.
As a result, child restraint systems will no longer be able to perform their intended protective function. This may also cause additional injuries.
If the rear seat backrest is not engaged and locked in place, the red lock verification indicator will be visible.
Vehicles with electrically adjustable rear bench seats:
The Top Tether belt may sit either too loose or too tight
The child restraint system may be loose, incorrectly positioned or damaged and then not perform its intended protective function.
If the child restraint system is equipped with a Top Tether belt:
The risk of injury may be reduced by Top Tether. The Top Tether belt enables an additional connection between the child restraint system attached with ISOFIX or i‑Size and the vehicle.
upwards More. 
under head restraint between the two head restraint bars. 
into Top Tether anchorage 
without twisting. . In doing so, comply with the child restraint system manufacturer's installation instructions. downwards More. Make sure that you do not interfere with the correct routing of Top Tether belt .