Mercedes-Benz GLC Owner's Manual page 172

Rear window heating
General notes
The rear window heating has a high current
draw. You should therefore switch it off as
soon as the window is clear. It otherwise
switches off automatically after several
minutes.
If the battery voltage is too low, the rear win-
dow heating may switch off.
Switching the sound on/off
Turn the key to position 2 in the ignition
X
lock ( page 187).
Y
Press the ¤ rocker switch up or down.
X
The indicator lamp above the ¤ rocker
switch lights up or goes out.
Operating the climate control system
169