Using the rear center seat belt
If the left-hand rear seat backrest is folded down and back up again, the rear center seat belt may lock. The seat belt can then not be pulled out.
To release the rear center seat belt:pull out the seat belt by the belt outlet on the backrest approximately 1 in (25 mm) and release it again.
The seat belt is retracted and released.
See also:
Cleaning the steering wheel and gear or selector lever
Thoroughly wipe with a damp cloth or use leather care agents that have
been recommended and approved by Mercedes- Benz.
...
Activating/deactivating DSR
Activating
DSR can only be activated if you are driving
no faster than 20 mph (30 km/h).
Vehicle without the Off-Road Pro Engineering
package
Vehicle with the Off-Road Pro Engineering package ...
General notes
USA only:
This device complies with Part 15 of the
FCC Rules. Operation is subject to the
following two conditions:
1. This device may not cause harmful
interference, and
2. this device must ...