Mercedes-Benz 2013 C-Class Coupe Owner's Manual page 111

Driver's and front-passenger seat
The system automatically switches down
from level 3 to level 2 after approximately
eight minutes.
The system automatically switches down
from level 2 to level 1 after approximately ten
minutes.
The system automatically switches off
approximately 20 minutes after it is set to
level 1.
X
Make sure that the key is in position 1 or
2 in the ignition lock.
X
To switch on: press button : repeatedly
until the desired heating level is set.
X
To switch off: press button : repeatedly
until all the indicator lamps go out.
Seats
109
Z