Mercedes-Benz C-Class Coupe Operator's Manual page 99

Make sure that the SmartKey is in position
X
1 or 2 in the ignition lock.
To switch on: press button : repeatedly
X
until the desired heating level is set.
To switch off: press button : repeatedly
X
until all the indicator lamps go out.
I n f o r m a t i o n P r o v i d e d b y :
Seats
97
Z