2022 MERCEDES-BENZ GLS SUV Owners Manual

Display messages
Possible causes/consequences and P Solutions
Auxiliary battery malfunc-
tion (whit
e display message) * The auxiliary battery for the automatic transmission is no longer being charged. 
Consult a q
ualiNed specialist workshop. 
Until then, always select park position j manuall
y before you switch oM the vehicle. 
Before leaving the vehicle, apply the electric parking brake.
Auxiliary battery malfunc-
tion (r

ed display message) *
Vehicles with automatic transmission: The auxiliar y battery for the transmission is no longer being charged. 
Consult a q
ualiNed specialist workshop. 
Vehicles with automatic transmission: until t
hen, always select park position j before you switch oM the vehicle. 
Before leaving the vehicle, apply the electric parking brake. Brakes
Display messages
Possible causes/consequences and P Solutions
$
Parking brake See Owner's
Manual * The yellow
$ indicat
or lamp is lit. The electric parking brake is malfunctioning.
To apply: 
Switch the vehicle oM and switc
h it back on 
Apply the electric parking brake manually (  pag
e 229).
If it is not possible to apply the electric parking brake: 
Consult a q
ualiNed specialist workshop.470
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and P Solutions 
Where necessary, also secure the parked vehicle against rolling away.
* The yellow $ indicat or lamp and the red $ indicator lamp are lit. The electric parking brake is malfunctioning.
To release: 
Switch the vehicle oM and switc
h it back on 
Release the electric parking brake manually ( pag
e 229).
or 
Release the electric parking brake automatically (  pag
e 228).
If it is still not possible to release the electric parking brake: 
Do not continue driving. Consult a q
ualiNed specialist workshop.
* The yellow $ indicat
or lamp is lit and the red $ indicator lamp is Oashing. The electric parking brake is malfunc-
tioning.
The electric parking brake could not be applied or released. 
Switch the vehicle oM and switc
h it back on
To apply: 
Release and then apply the electric parking brake manually (  pag
e 229).
To release: 
Apply and then release the electric parking brake manually. Display messages and warning/indicator lamps
471

Display messages
Possible causes/consequences and P Solutions
If it is not possible to apply the electric parking brake or the red $ indicat or lamp continues to Oash: 
Do not continue driving. Consult a q
ualiNed specialist workshop. 
Where necessary, also secure the parked vehicle against rolling away.
* The yellow $ indicat
or lamp is lit and the red $ indicator lamp Oashes for approximately ten seconds aser the
electric parking brake has been applied or released. It then remains lit or goes out. The electric parking brake is mal-
functioning.
If the state of charge is too low: 
Charge the 12 V battery.
To apply: 
Switch oM t
he vehicle.
The electric parking brake will be applied automatically.
If you do not want the electric parking brake to be applied, e.g. at an automatic car wash or when the vehicle is being
t
owed, leave the vehicle switched on. This does not include having the vehicle towed with the rear axle raised.
If the electric parking brake is not applied automatically: 
Switch the vehicle oM and switc
h it back on 
Release and then apply the electric parking brake manually (  pag
e 229).
If it is still not possible to apply the electric parking brake: 
Consult a q
ualiNed specialist workshop.472
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and P Solutions 
Where necessary, also secure the parked vehicle against rolling away.
To release: 
If the conditions for automatic release are fulNlled and t he electric parking brake is not released automatically,
release the electric parking brake manually (  page 229).
If it is still not possible to release the electric parking brake: 
Do not continue driving. Consult a q
ualiNed specialist workshop.
$
Release parking brake * The red $ indicat

or lamp is Oashing.
The electric parking brake is applied while you are driving:
= A condition for automatic release of the electric parking brake has not been fulNlled ( page 228).
= You are performing emergency braking using the electric parking brake (  page 229).
Check the conditions for automatic release of the electric parking brake. 
Release the electric parking brake manually.
$
Turn on the ignition to
release the parking brake * The red $ indicat

or lamp is lit.
You have attempted to release the electric parking brake with the vehicle switched oM.
Switch on the vehicle. Display messages and warning/indicator lamps
473

Display messages
Possible causes/consequences and P Solutions
M
Check brake fluid level * There is
insuPcient br ake Ouid in the brake Ouid reservoir. &
WARNING Risk of an accident due t
o low brake Ouid level
If the brake Ouid le
vel is too low, the braking eMect and the braking characteristics may be impaired. 
Stop the vehicle as soon as possible, paying attention to road and tr
aPc conditions. Do not continue driving. 
Consult a q
ualiNed specialist workshop. 
Do not top up the brake Ouid.Check brake pads See
Owner's Manual
* The brakepads have reached the wear limit. 
Consult a q
ualiNed specialist workshop.Driving systems
Display messages
Possible causes/consequences and P Solutions

Display messages
Possible causes/consequences and P Solutions
é
ATTENTION ASSIST inoper-
ative * ATTENTION ASSIST is malfunctioning. 
Consult a qualiNed specialist workshop.
é
ATTENTION ASSIST Take a
break! * ATTENTION ASSIST has detected fatigue or an increasing lack of concentration on the part of the driver
( pag
e 238). 
If necessary, take a break.
J
- - -
km/h * Cruise control cannot be activated as not all activation conditions are
fulNlled.
Observe the activation conditions for cruise control (  pag e 241).
Cruise control inoperative * Cruise control is malfunctioning. 
Consult a q
ualiNed specialist workshop.
Cruise control and Limiter
inoperative * Cruise control and the limiter are malfunctioning. 
Consult a q
ualiNed specialist workshop. Display messages and warning/indicator lamps
475

Display messages
Possible causes/consequences and P Solutions
Cruise control off * Cruise control has been deactivated.
If t here is an additional warning tone, cruise control has been deactivated automatically (  page 240).

Display messages
Possible causes/consequences and P Solutions