Mercedes-Benz S-Class 2009 - Manual (Page 397)

Climate control system
395
G Warning!
Do not change lanes or make turns, while
red warning lamp 1 is flashing. Doing so
could result in an accident and seroius
injury to yourself and others.
X Remain on the lane that you are currently
on until traffic conditions permit to change.
If the turn signal remains on, red warning
lamp
1 will flash to indicate that vehicles
have been detected. No further audible
warnings will sound.
Climate control system
Control panels
Controls in detail
Z