See also:

Problems with the rear window defroster
The rear window defroster has deactivated itself prematurely or cannot be activated. - Switch off any consumers that are not required, e.g. reading lamps or interior lighting. When the battery ...

Controlling the rear-compartment climate control automatically using the rear control panel
Turn the SmartKey to position 2 in the ignition lock. Set the desired temperature. To activate: press rocker switch 15 up or down and select AUTO. To deactivate: press rocker switch 15 up ...

DEF refill bottle
DEF refill bottles can be obtained at many gas stations or at an authorized Mercedes-Benz Center. Refill bottles without a threaded cap do not provide overfill protection. DEF may leak if over ...