Mercedes-Benz E-Class Saloon Owner's Manual page 134

Turn the key to position 1 or 2 in the ignition
X
lock ( page 179).
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
131
Z