Mercedes-Benz 2016 SLK Operator's Manual page 134

Operating the climate control systems
132
Rear window defroster
General notes
The rear window defroster has a high current
draw. You should therefore switch it off as
soon as the rear window is clear. Otherwise,
the rear window defroster switches off auto-
matically after several minutes.
If the battery voltage is too low, the rear win-
dow defroster may switch off.
Activating or deactivating
Turn the SmartKey to position 2 in the igni-
X
tion lock ( page 139).
Y
Press the ¤ button.
X
The indicator lamp in the ¤ button lights
up or goes out.