Mercedes-Benz CLA Operator's Manual page 103

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.
Turn the SmartKey to position 1 or 2 in the
X
ignition lock ( page 141).
Y
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
If the battery voltage is too low, the seat
heating may switch off.
Seats
101
Z