ECU MERCEDES-BENZ GLA SUV 2017 Repair Manual

Display messages
Possible causes/consequences and
M
MSolutions Ð
Steering malfunc‐ Steering malfunc‐
tion See Owner's tion See Owner's
Manual Manual The electric steering lock is malfunctioning.
G WARNING
The steering may be locked by the electric steering lock.
There is a risk of an accident.
X Stop the vehicle safely as soon as possible, paying attention to road
and traffic conditions.
X Secure the vehicle against rolling away (Y page 166).
X Do not drive on.
X Consult a qualified specialist workshop. _
Before Before
starting
starting the
the
engine, turn the
engine, turn the
steering wheel. steering wheel. The electric steering lock was unable to unlock the steering.
X Remove the key from the ignition lock.
X To unlock the steering, move the steering wheel slightly.
X Insert the key into the ignition lock again. Telephone
Telephone
No
Noservice
service Your vehicle is outside the mobile phone network provider's trans-
mitter/receiver range.
X Wait until the mobile phone operational readiness symbol appears
in the multifunction display. ¥
Top up washer fluid Top up washer fluid The washer fluid level in the washer fluid reservoir has dropped below
the minimum.
X Top up the washer fluid (Y page 306).Wiper malfunction‐
Wiper malfunction‐
ing ing The windscreen wipers are defective.
X Consult a qualified specialist workshop. Hazard warning
Hazard warning
lamps malfunction‐ lamps malfunction‐
ing ing The hazard warning lamps are faulty.
X Consult a qualified specialist workshop. Key
Display messages
Possible causes/consequences and
M
MSolutions Â
Key Key
does
does not
notbelong
belong
to vehicle
to vehicle You have put the wrong key in the ignition lock.
X Use the correct key. Â
Replace key Replace key The key needs to be replaced.
X Consult a qualified specialist workshop. Â
Change Change
key
keybatteries
batteries The key battery is discharged.
X Change the battery(Y page 82). Display
messages
263On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions Â
Key not detected Key not detected
(red display message) The key is not in the vehicle.
A warning tone also sounds.
If the engine is switched off, you can no longer lock the vehicle cen-
trally or start the engine.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 166).
X Locate the key. Because there is interference from a strong source of radio waves, the
key is not detected whilst the engine is running.
A warning tone also sounds.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 166).
X Insert the key into the ignition lock and bring into key mode. Â
Key not detected Key not detected
(white display message) The key is currently undetected.
X Change the location of the key in the vehicle.
If the key still cannot be detected:
X Operate the vehicle with the key in the ignition lock if necessary. Â
Remove Remove
starting
starting but‐
but‐
ton,
ton, then
theninsert
insert key
key The key is continually undetected.
The key detection function has a temporary malfunction or is faulty. A
warning tone also sounds.
X Insert the key into the ignition lock and turn it to the desired posi-
tion.
X Consult a qualified specialist workshop. Warning and indicator lamps on the instrument cluster
General notes
Some systems perform a self test when the ignition is switched on. Some warning and indicator
lamps may temporarily switch on or flash during the test. This behaviour is nothing to be concerned about.
The warning and indicator lamps will alert you to a malfunction if they switch on or flash after the
engine is started or while driving. 264
Wa
rning and indi cator lamps on the instrument clusterOn-board computer and displays

Safety
Seat belts Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions ü
N
Only for certain countries: the red seat belt warning lamp lights up for
six seconds after the engine starts.
The seat belt warning lamp reminds the driver and front passenger to fasten their
seat belts.
X Fasten your seat belt (Y page 45).ü
N
For certain countries only: the red seat belt warning lamp lights up after the
engine starts. In addition, a warning tone sounds for up to six seconds.
The driver's seat belt is not fastened.
X Fasten your seat belt (Y page 45).
The warning tone ceases. ü
N
The red seat belt warning lamp lights up after the engine starts, as soon as the
driver's or the front-passenger door is closed.
The driver or passenger has not fastened their seat belt.
X Fasten your seat belt (Y page 45).
The warning lamp goes out.
There are objects on the front-passenger seat.
X Remove the objects from the front-passenger seat and stow them in a secure
place.
The warning lamp goes out. ü
N
The red seat belt warning lamp flashes and an intermittent audible warning
sounds.
The driver or passenger has not fastened their seat belt. At the same time, you are
driving faster than 25 km/h or have briefly driven faster than 25 km/h.
X Fasten your seat belt (Y page 45).
The warning lamp goes out and the intermittent warning tone ceases.
There are objects on the front-passenger seat. At the same time, you are driving
faster than 25 km/h or have briefly driven faster than 25 km/h.
X Remove the objects from the front-passenger seat and stow them in a secure
place.
The warning lamp goes out and the intermittent warning tone ceases. Warning and indicator lamps on the instrument cluster
265On-board computer and displays Z

Safety systems
Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions J
N
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 Stop the vehicle safely as soon as possible, paying attention to road and traffic
conditions. Do not drive on.
X Secure the vehicle against rolling away (Y page 166).
X Consult a qualified specialist workshop.
X Observe the additional display messages on the multifunction display. J
N
The red brake system warning lamp is lit while the engine is running. A warning
tone also sounds.
There is insufficient brake fluid in the brake fluid reservoir.
G WARNING
Braking efficiency may be impaired.
There is a risk of an accident.
X Stop the vehicle safely as soon as possible, paying attention to road and traffic
conditions. Do not drive on.
X Secure the vehicle against rolling away (Y page 166).
X Do not top up the brake fluid. Topping up will not correct the fault.
X Consult a qualified specialist workshop.
X Observe the additional display messages on the multifunction display. 266
Warning and indicator lamps on the instrument clusterOn-board computer and displays

Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions ?
N
The red coolant warning lamp lights up while the engine is running and the
coolant temperature gauge is at the start of the scale.
The temperature sensor for the coolant temperature gauge is malfunctioning.
The coolant temperature is no longer being monitored. The engine could be dam-
aged if the coolant temperature is too high.
X Stop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine. Do not continue driving.
X Secure the vehicle against rolling away (Y page 166).
X Consult a qualified specialist workshop. Warning and indicator lamps on the instrument cluster
273On-board computer and displays Z

Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
M Solutions ?
N
The red coolant warning lamp lights up while the engine is running.
The coolant level is too low.
If the coolant level is correct, the airflow to the engine radiator may be blocked or the electric engine radiator fan may be malfunctioning.
The coolant is too hot and the engine is not being cooled sufficiently.
X Observe the additional display messages in the multifunction display.
X Stop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine.
X Secure the vehicle against rolling away (Y page 166).
X Leave the vehicle and keep a safe distance from the vehicle until the engine has
cooled down.
X Check the coolant level and top up the coolant, making sure to observe the
warning notes (Y page 305).
X If you have to top up the coolant frequently, have the engine cooling system
checked.
X Make sure that the air supply to the engine radiator is not blocked, e.g. by frozen
slush.
X Do not start the engine again until the coolant temperature is below 120 †. The
engine may otherwise be damaged.
X 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-start traffic. ?
N
The red coolant warning lamp lights up while the engine is running. A warning
tone also sounds.
The coolant temperature has exceeded 120 †. The airflow to the engine radiator may be blocked or the coolant level may be too low.
G WARNING
The engine is not being cooled sufficiently and may be damaged.
Never drive with an overheated engine. Driving when your engine has overheated
can cause any fluids that may have leaked into the engine compartment to catch fire.
In addition, steam from an overheated engine can cause serious burns, which can
occur just by opening the bonnet.
There is a risk of injury.
X Observe the additional display messages in the multifunction display.
X Stop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine.
X Secure the vehicle against rolling away (Y page 166).
X Leave the vehicle and keep a safe distance from the vehicle until the engine has
cooled down.
X Check the coolant level and top up the coolant, making sure to observe the
warning notes (Y page 305).
X If you have to top up the coolant frequently, have the engine cooling system
checked. 274
Warning and indicator lamps on the instrument clusterOn-board computer and displays

phone, change the device name (see the man-
ufacturer's operating instructions).
If the mobile phone supports the PBAP (Phone
Book Access Profile) and MAP (M essage
Access Profile) Bluetooth ®
profiles, the follow-
ing information will be transmitted after you
connect:
R Telephone book
R Call lists
R Text messages and e-mails
i Further information on suitable mobile
phones can be found at: http://
www.mercedes-benz.com/connect
Searching for and authorising (connect- ing) a mobile phone Before using your mobile phone with the multi-
media system for the first time, you will need to
search for the phone and then authorise (con-
nect) it. Depending on the mobile phone, author- isation takes place by means of Secure Simple
Pairing or by entering a passkey. The multimedia
system automatically makes the procedure that is relevant for your mobile phone available. The
mobile phone is always connected automati-
cally after authorisation. Further information on
using a mobile phone with the multimedia sys-
tem (see the Digital Owner's Manual).
If the multimedia system does not detect your
mobile phone, this may be due to particular
security settings on your mobile phone (see the manufacturer's operating instructions).
Only one mobile phone can be connected to the
multimedia system at any one time.
Searching for a mobile phone
Multimedia system:
X Select Tel/
Tel/®Q Connect Connect
device
device QSearch for phonesSearch for phones QStartStart
search
search .
The available mobile phones are displayed. Symbols in the device list Sym-
bol Explanation
Ï
New mobile phone found, not yet
authorised.
Ñ
Mobile phone is authorised, but is
not connected.
#
Mobile phone is authorised and
connected.
Connecting the mobile phone
Authorisation using Secure Simple Pairing:
X Select the mobile phone.
A code is displayed in the multimedia system
and on the mobile phone.
X If codes match: selectYes Yeson the multimedia
system.
X Confirm the code on the mobile phone.
Depending on the mobile phone used, con-
firm the connection to the multimedia system
and for the PBAP and MAP Bluetooth ®
pro-
files. The prompt to confirm may take up to
two minutes to be displayed (see the manu-
facturer's operating instructions).
X If the codes are different: selectNo Noon the
multimedia system.
The process is cancelled.
Repeat authorisation.
Authorisation by entering a passkey (passcode): X Select the Bluetooth ®
name of the mobile
phone.
The input menu for the passkey is displayed.
X Choose a one to sixteen-digit number combi-
nation as a passkey.
X Enter the passkey on the multimedia system.
X Press ¬to confirm.
X Enter and confirm the passkey on the mobile
phone. Depending on the mobile phone used,
confirm the connection to the multimedia sys-
tem and for the PBAP and MAP Bluetooth ®
profiles. The prompt to confirm may take up
to two minutes to be displayed (see the man- ufacturer's operating instructions).
i Mobile phones that are connected to the
optionally available telephone module with
Bluetooth ®
(SAP profile) are displayed sepa- Operating system
281Multimedia system Z

rately in the device list. These are found below
the entry MB SAP module phones
MB SAP module phones. Connecting a mobile phone (Audio 20)
Requirements For telephony via the Bluetooth
®
interface, you
require at least one Bluetooth ®
-capable mobile
phone depending on use of one-telephone
mode ortwo-telephone mode. The mobile
phone must support Hands-Free Profile 1.0 or
above.
In two-telephone mode you can use all the
functions of the multimedia system with the
main telephone. With the additional tele-
phone, you can receive incoming calls.
Multimedia system:
X Select Vehicle
VehicleQ System set‐ System set‐
tings
tingsQActivate Bluetooth Activate Bluetooth.
X Activate Bluetooth ®
O.
Mobile phone:
X Activate Bluetooth ®
and, if necessary, Blue-
tooth ®
visibility for other devices (see the
manufacturer's operating instructions).
The Bluetooth ®
device names for all of one man-
ufacturer's products might be identical. To
make it possible to clearly identify your mobile
phone, change the device name (see the man-
ufacturer's operating instructions).
If the mobile phone supports the PBAP (Phone
Book Access Profile) and MAP (Message
Access Profile) Bluetooth ®
profiles, the follow-
ing information is transmitted after you connect
the main telephone:
R Telephone book
R Call lists
R Text messages and e-mails
i Further information on suitable mobile
phones can be found at: http://
www.mercedes-benz.com/connect
Searching for and authorising (connect-
ing) a mobile phone Before using your mobile phone with the multi-
media system for the first time, you will need to
search for the phone and then authorise (con-
nect) it. Depending on the mobile phone, author- isation takes place by means of Secure Simple
Pairing or by entering a passkey. The multimedia
system automatically makes the procedure that is relevant for your mobile phone available. The
mobile phone is always connected automati-
cally after authorisation. Further information on
using a mobile phone with the multimedia sys-
tem (see the Digital Owner's Manual).
If the multimedia system does not detect your
mobile phone, this may be due to particular
security settings on your mobile phone (see the manufacturer's operating instructions).
Searching for a mobile phone
Multimedia system:
X Select Tel/
Tel/®QConnect device Connect deviceQCon‐ Con‐
nect new device nect new device.
X Select Connect via vehicle
Connect via vehicle.
X Select the mobile phone.
Connecting the mobile phone
X One-telephone mode: select Main phone Main phone.
X Two-telephone mode: selectAdditional Additional
phone (incoming calls only)
phone (incoming calls only) when a
mobile phone is already connected.
X Authorisation using Secure Simple Pair-
ing:
A code is displayed in the multimedia system
and on the mobile phone.
X Confirm the code on the mobile phone.
Depending on the mobile phone used, con-
firm the connection to the multimedia system
and for the PBAP and MAP Bluetooth ®
pro-
files. The prompt to confirm may take up to
two minutes to be displayed (see the manu-
facturer's operating instructions).
X If the codes are different: select No Noon the
multimedia system.
The process is cancelled.
Repeat authorisation.
or X Authorisation by entering a passkey
(passcode):
enter any one- to sixteen-digit
number sequence which you have chosen
yourself.
X Press ¬to confirm.
X Enter and confirm the passkey on the mobile
phone. Depending on the mobile phone used,
confirm the connection to the multimedia sys-
tem and for the PBAP and MAP Bluetooth ®
profiles. The prompt to confirm may take up 282
Operating systemMultimedia system

Loading guidelines
G
WARNING
If objects, luggage or loads are not secured or not secured sufficiently, they could slip, tip
over or be flung around and thereby hit vehicle
occupants. There is a risk of injury, especially when braking or abruptly changing directions.
Always store objects so that they cannot be
flung around. Secure objects, luggage or
loads against slipping or tipping before the
journey. G
WARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. If the tailgate is open when the engine is running, particu-
larly if the vehicle is moving, exhaust fumes
could enter the passenger compartment.
There is a risk of poisoning.
Turn off the engine before opening the tail-
gate. Never drive with the tailgate open. G
WARNING
The exhaust tail pipe and tail pipe trim can
become very hot. If you come into contact
with these parts of the vehicle, you could burn
yourself. There is a risk of injury.
Always be particularly careful around the
exhaust tail pipe and the tail pipe trim. Allow
these components to cool down before touch-
ing them.
The handling characteristics of a laden vehicle
are dependent on the distribution of the load
within the vehicle.
Observe the following notes on loading and
transporting a load:
R never exceed the maximum permissible gross
vehicle weight or the permissible axle loads
for the vehicle (including occupants).
R the luggage compartment is the preferred
place to store objects.
R position heavy loads as far forwards as pos-
sible and as low down in the luggage com-
partment as possible. R
the load must not protrude above the upper
edge of the seat backrests.
R always place the load against the rear or front
seat backrests. Make sure that the seat
backrests are securely locked into place.
R always place the load behind unoccupied
seats if possible.
R use the lashing eyelets and the luggage nets
to transport loads and luggage.
R only use lashing eyelets and fastening com-
ponents that are suitable for the weight and
size of the load.
R the maximum load capacity of the stowage
well under the luggage compartment floor is
25 kg.
R secure the load with sufficiently strong and
wear-resistant lashing material. Pad sharp
edges for protection.
! Do not position the load on one part of the
folding luggage compartment floor only. The
maximum load capacity of the folding luggage compartment floor is 100 kg. Spread the
weight evenly to avoid damaging the luggage
compartment floor. Place a solid board under the load if necessary. Please note that the
load on the luggage compartment floor will be increased when the load is lashed down. Stowage areas
Stowage compartments
Important safety notes G
WARNING
If you transport objects in the vehicle interior and these are not adequately secured, they
could slip or be flung around and thereby
strike vehicle occupants. In addition, cup
holders, open stowage spaces and mobile
phone brackets may not always be able to
hold the objects placed in them in the event of an accident. There is a risk of injury, particu-
larly in the event of sharp braking or sudden
changes of direction. 288
Stowage areasStowing and features

R
Always stow objects in such a way that they
cannot be tossed about in these or similar
situations.
R Always make sure that objects do not proj-
ect from stowage spaces, luggage nets or
stowage nets.
R Ensure that closable stowage spaces are
shut before beginning your journey.
R Always stow and secure heavy, hard, poin-
ted, sharp-edged, fragile or outsize objects in the load compartment.
Observe the loading guidelines (Y page 288).
Front stowage compartments Glove compartment
X
To open: pull handle :and open glove com-
partment flap ;.
X To close: fold glove compartment flap ;
upwards until it engages.
There is a pen holder at the top of the glove
compartment flap.
Spectacles compartment X
To open: press marking :.
Make sure that the spectacles compartment is
always closed while the vehicle is in motion.
Stowage compartment in the front centre
console Illustration: vehicles with DIRECT SELECT lever
X To open: press the marking on cover :.
i Depending on the vehicle's equipment,
there may be an ashtray in the centre console
instead of the stowage compartment.
Stowage compartment in front of the arm-
rest (vehicles with automatic transmis-
sion) Vehicles with DIRECT SELECT lever
X To open: press the marking on cover :.
i You can remove the non-slip mat and the
insert for cleaning. When removing the insert
you will have to overcome some slight resist-
ance. Stowage areas
289Stowing an d features Z