warning MERCEDES-BENZ GLS 2017 Owners Manual
Page 278 of 390
Safety systems Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
M '
Q ' (USA only), M (Canada only): the red brake system warning lamp is lit
while the engine is running.
A warning tone also sounds.
G WARNING
The brake boosting effect is malfunctioning and the braking characteristics may be
affected.
There is a risk of an accident. X
Pull over and stop the vehicle safely as soon as possible, paying attention to road
and traffic conditions. Do not continue driving under any circumstances. X
Secure the vehicle against rolling away ( Y
page 159).X
Consult a qualified specialist workshop. X
Observe the additional display messages in the multifunction display.
M '
Q ' (USA only), M (Canada only): the red brake system warning lamp is lit
while the engine is running.
A warning tone also sounds.
G WARNING
There is not enough brake fluid in the brake fluid reservoir.
There is a risk of an accident. X
Pull over and stop the vehicle safely as soon as possible, paying attention to road
and traffic conditions. Do not continue driving under any circumstances. X
Secure the vehicle against rolling away ( Y
page 159).X
Do not add brake fluid. Adding more will not correct the malfunction. X
Consult a qualified specialist workshop. X
Observe the additional display messages in the multifunction display.
'
Q USA only: the red brake system warning lamp is lit while the engine is running.
The multifunction display also shows a display message with the & symbol.
The brake pads/linings have reached their wear limit. X
Visit a qualified specialist workshop.276
Warning and indicator lamps in the instrument cluster
On-board computer and displays
Page 279 of 390
Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
%
Q The yellow ABS warning lamp is lit while the engine is running.
ABS (Anti-lock Braking System) is deactivated due to a malfunction.
Other driving systems and driving safety systems may also malfunction.
In addition, the
Page 280 of 390
Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
%
Q The yellow ABS warning lamp is lit while the engine is running.
ABS is temporarily unavailable.
Other driving systems and driving safety systems may also malfunction.
In addition, the
Page 281 of 390
Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
%
Q The yellow ABS warning lamp is lit while the engine is running.
EBD is not available due to a malfunction.
Other driving systems and driving safety systems may also malfunction.
In addition, the
Page 282 of 390
Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
Page 283 of 390
Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
Page 284 of 390
Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
I $
Q I (USA only), $ (Canada only): the red indicator lamp for the electric
parking brake flashes or is lit and/or the yellow warning lamp for the electric
parking brake is lit. X
Observe the additional display messages in the multifunction display.
u
Q The red restraint system warning lamp is lit while the engine is running.
The restraint system is malfunctioning.
G WARNING
The air bags or Emergency Tensioning Devices may either be triggered uninten-
tionally or, in the event of an accident, may not be triggered.
There is an increased risk of injury. X
Observe the additional display messages in the multifunction display. X
Drive on carefully. X
Contact a qualified specialist workshop and have the restraint system checked.
For further information about the restraint system, see ( Y
page 41).282
Warning and indicator lamps in the instrument cluster
On-board computer and displays
Page 285 of 390
Engine Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
Page 286 of 390
Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
Page 287 of 390
Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P SolutionsX
At coolant temperatures below 248 ‡ (120 †), drive to the nearest qualified
specialist workshop. X
Avoid heavy loads on the engine as you do so, e.g. driving in mountainous terrain
and stop-and-go traffic.
Driving systems Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions