Mercedes-Benz 2016 GL Operator's Manual page 173

To activate: press ECO button :.
X
Indicator lamp ; lights up. If drive pro-
gram S or M is active, the automatic trans-
mission switches to drive program C.
If the indicator lamp on the ECO button is off,
the ECO start/stop function has been deac-
tivated manually or as the result of a mal-
function.
Driving
171
Z