Infrared reflective windshield
The infrared reflecting glass prevents the vehicle interior from becoming too hot. It also blocks radio waves up into the gigahertz range.

In order to operate radio-controlled equipment, e.g. toll recording systems, areas 1 on the windshield are permeable to radio waves. In these areas, you can install radio-controlled systems.
These areas can best be seen from outside the vehicle by observing the light reflected off the windshield.
See also:
High outside temperatures
If DEF heats up to over 122 °F (50 °C) for
extended periods, e.g. as a result of direct
sunlight on the DEF reservoir, DEF can
decompose. Ammonia vapors develop as a
result.
WARNING
When o ...
Checking the oil level using the oil dipstick
Park the vehicle on a level surface. To check the oil level with the engine
at operating temperature, switch the engine off and wait for approximately five
minutes.
Pull oil dipstick 1 ou ...
Override feature for the rear sidewindows
WARNING
When children ride on the vehicle's rear seats,
activate the override switch. Otherwise, the
children could be injured, e.g. by trapping
themselves in the rear side window.
...
