ECU MERCEDES-BENZ CLA 2016 Service Manual

Safety systems Problem
Possible causes/consequences and P Solutions
' (USA only)
M (Canada only)
The red brake system
warning lamp comes on
while the engine is run-
ning. A warning tone
also sounds. G WARNING
The brake boosting effect is malfunctioning and the braking char-
acteristics 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 169).X
Consult a qualified specialist workshop. X
Observe the additional display messages in the multifunction
display.
' (USA only)
M (Canada only)
The red brake system
warning lamp comes on
while the engine is run-
ning. A warning tone
also sounds. There is not enough brake fluid in the brake fluid reservoir.
G WARNING
The braking effect may be impaired.
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 169).X
Do not add brake fluid. Adding more will not remedy the mal-
function. X
Consult a qualified specialist workshop. X
Observe the additional display messages in the multifunction
display.260
Warning and indicator lamps in the instrument cluster
On-board computer and displays

Tires Problem
Possible causes/consequences and P Solutions
w
The yellow tire pressure
monitor warning lamp
(pressure loss/
malfunction) is lit. The tire pressure monitor has detected a loss of pressure in at
least one of the tires.
G WARNING
Tire pressures that are too low pose the following hazards: R
they may burst, especially as the load and vehicle speed
increase. R
they may wear excessively and/or unevenly, which may greatly
impair tire traction. R
the driving characteristics, as well as steering and braking, may
be greatly impaired.
There is a risk of an accident. X
Stop the vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions as you do so. X
Secure the vehicle against rolling away ( Y
page 169).X
Observe the additional display messages in the multifunction
display. X
Check the tires and, if necessary, follow the instructions for a
flat tire ( Y
page 310). X
Check the tire pressure ( Y
page 336).X
If necessary, correct the tire pressure.
w
The yellow tire pressure
monitor warning lamp
(pressure loss/
malfunction) flashes for
approximately one
minute and then
remains lit. The tire pressure monitor is faulty.
G WARNING
The system is possibly unable to recognize or register low tire
pressure.
There is a risk of an accident. X
Observe the additional display messages in the multifunction
display. X
Visit a qualified specialist workshop immediately.270
Warning and indicator lamps in the instrument cluster
On-board computer and displays

Useful information
i This Operator's Manual describes all
models and all standard and optional equip-
ment of your vehicle available at the time of
publication of the Operator's Manual.
Country-specific differences are possible.
Please note that your vehicle may not be
equipped with all features described. This
also applies to safety-related systems and
functions.
i Read the information on qualified special-
ist workshops ( Y
page 25).
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, particu-
larly in the event of sudden braking or a sud-
den change in direction.
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. Exhaust
gases can enter the vehicle interior if the
trunk lid is open when the engine is running,
especially if the vehicle is in motion. There is a
risk of poisoning.
Always switch off the engine before opening
the trunk lid. Never drive with the trunk lid
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 vehi-
cle are dependent on the distribution of the
load within the vehicle. For this reason, you
should observe the following notes when
transporting a load: R
Never exceed the maximum permissible
gross vehicle mass or the gross axle weight
rating for the vehicle (including occupants).
The values are specified on the vehicle
identification plate on the B-pillar of the
driver's door. R
The trunk is the preferred place to carry
objects. R
Position heavy loads as far forwards as pos-
sible and as low down in the trunk as pos-
sible. 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 cargo tie-down rings and the parcel
nets to transport loads and luggage. R
Use cargo tie-down rings and fastening
materials appropriate for the weight and
size of the load. R
Secure the load with sufficiently strong and
wear-resistant tie-downs. Pad sharp edges
for protection.272
Loading guidelines
Stowage and features

Stowage areas
Stowage spaces
Important safety notes
G WARNING
If objects in the passenger compartment are
stowed incorrectly, they can slide or be
thrown around and hit vehicle occupants.
There is a risk of injury, particularly in the
event of sudden braking or a sudden change
in direction. R
Always stow objects so that they cannot be
thrown around in such situations. R
Always make sure that objects do not pro-
trude from stowage spaces, parcel nets or
stowage nets. R
Close the lockable stowage spaces before
starting a journey. R
Always stow and secure heavy, hard, poin-
ted, sharp-edged, fragile or bulky objects in
the trunk.
Observe the loading guidelines ( Y
page 272).
Stowage compartments in the front
Glove box
X
To open: pull handle C and open glove box
flap D .X
To close: fold glove box flap D upwards
until it engages.
There is a pen holder at the top of the glove
box flap. Eyeglasses compartment X
To open: press marking C .
Make sure that the eyeglasses compartment
is always closed while the vehicle is in motion.
Stowage compartment in the front center
console
X
To open: press the marking on cover C .
i Depending on the vehicle equipment,
there may be an ashtray in the center con-
sole instead of a storage compartment. Stowage areas 273
Stowage and features Z

Stowage compartment in front of the arm-
rest (vehicles with automatic transmis-
sion) X
To open: press the marking on cover C .
i You can remove the non-slip mat and the
insert for cleaning. When removing the
insert you will have to overcome some
slight resistance.
Stowage compartment under the armrest
X
To open: on vehicles with movable armr-
ests, make sure that the armrest is in the
rearmost position. X
Press button C and fold the armrest up.
Depending on the vehicle equipment, the
armrest can be moved backwards or forwards
in a longitudinal direction.
Depending on the vehicle's equipment, the
following may be in the stowage compart-
ment: a multimedia connector unit with an SD
card slot and 2 USB ports, e.g. for use with an
iPod ®
, iPhone ®
or MP3 player; see the sepa-
rate operating instructions. Stowage compartment under the driver's
seat and front-passenger seat
G WARNING
If you exceed the maximum load for the stow-
age compartment, the cover may not be able
to restrain the items. Items may be thrown out
of the stowage compartment and hit vehicle
occupants. There is a risk of injury, particu-
larly in the event of sudden braking or a sud-
den change in direction.
Never exceed the maximum permissible load
for the stowage compartment. Stow and
secure heavy objects in the trunk.
The maximum permissible load of the stow-
age compartment is 2.6 lbs (1.5 kg).
X
To open: pull handle C up and fold
cover D forwards.
Stowage space in the rear
Stowage compartment in the rear center
console274
Stowage areas
Stowage and features

Folding the rear seat backrest forwards
and back Folding the rear seat backres ts forwardX
Fully insert the backrest head restraints if
necessary ( Y
page 104).X
Move the driv er's or front-passenger seat
forward if necessary.X
Pull left-hand or right-hand release han-
dle D of the seat backrest forwards.
Corresponding seat backrest C is
released. X
Fo ld backrest C forwards.X
Move the driv er's or front-passenger seat
back if necessary.
X
In sert the seat belt into seat-belt holder C .
Folding the rear seat backrest back
! Make sure that the seat belt does not
become trapped when folding the rear seat
backrest back. Otherwise, it could be dam-
aged. X
Move the driv er's or front-passenger seat
forward if necessary. X
Fo ld seat backrest C back unt il it engages.
Red lock status indicator D is no longer
visible. X
Adjust the head restraints if necessary
( Y
page 104). X
Move the driver's or front-passenger seat
back if necessary.
Securing cargo
Observe the fol lowin g notes on securing
loads: R
Observe the loadin g guidelines
( Y
page 272). R
Se cure the load using the cargo tie-down
rings. R
Distribute the load on the cargo tie-down
rings evenly. R
Do not use elast ic straps or nets to secure
a load, as these are on ly intended as an
anti-slip protection for light loads. R
Do not route tie- down s across sharp edges
or corners. R
Pad sharp edges for protection.276
Stowage areas
Stowage and features

You will find information on the maximum roof
load in the "Technical data" section
( Y
page 371).
An incorrectly secured roof carrier or roof
load may become detached from the vehicle.
You must therefore ensure that you observe
the roof carrier manufacturer's installation
instructions.
Attaching the roof carrier X
Open covers C carefully in the direction of
the arrow. X
Fold covers C upwards.X
Only secure the roof carrier to the anchor-
age points under covers C .X
Observe the manufacturer's installation
instructions.
Features
Cup holder
Important safety notes
G WARNING
The cup holder cannot hold a container secure
whilst traveling. If you use a cup holder whilst
traveling, the container may be flung around
and liquid may be spilled. The vehicle occu-
pants may come into contact with the liquid
and if it is hot, they may be scalded. You may
be distracted from the traffic conditions and
you could lose control of the vehicle. There is
a risk of an accident and injury. Only use the cup holder when the vehicle is
stationary. Only use the cup holder for con-
tainers of the right size. Always close the con-
tainer, particularly if the liquid is hot.
G WARNING
If objects in the passenger compartment are
stowed incorrectly, they can slide or be
thrown around and hit vehicle occupants.
There is a risk of injury, particularly in the
event of sudden braking or a sudden change
in direction. R
Always stow objects so that they cannot be
thrown around in such situations. R
Always make sure that objects do not pro-
trude from stowage spaces, parcel nets or
stowage nets. R
Close the lockable stowage spaces before
starting a journey. R
Always stow and secure heavy, hard, poin-
ted, sharp-edged, fragile or bulky objects in
the trunk.
! Only use the cup holders for containers of
the right size and which have lids. The
drinks could otherwise spill.
Observe the loading guidelines ( Y
page 272).
The stowage compartments in the doors pro-
vide space for bottles: R
front: capacity up to 34 fl. oz. (1.0 l) R
rear: capacity up to 17 fl. oz. (0.5 l)
Cup holder in the front-compartment
center console278
Features
Stowage and features

Have the system checked at the nearest
authorized Mercedes-Benz Center or contact
the following service hotlines:
Mercedes-Benz Customer Assistance Center
at 1-800-FOR-MERCedes (1-800-367-6372)
or 1-866-990-9007
Emergency call Important safety notes
G WARNING
It can be dangerous to remain in the vehicle,
even if you have pressed the SOS button in an
emergency if: R
you see smoke inside or outside of the vehi-
cle, e.g. if there is a fire after an accident R
the vehicle is on a dangerous section of
road R
the vehicle is not visible or cannot easily be
seen by other road users, particularly when
dark or in poor visibility conditions
There is a risk of an accident and injury.
Leave the vehicle immediately in this or simi-
lar situations as soon as it is safe to do so.
Move to a safe location along with other vehi-
cle occupants. In such situations, secure the
vehicle in accordance with national regula-
tions, e. g. with a warning triangle.
General notes
Observe the notes on system activation
( Y
page 282).
An emergency call is dialed automatically if an
air bag or Emergency Tensioning Device is
triggered. You cannot end an automatically
triggered emergency call yourself.
An emergency call can also be initiated man-
ually.
As soon as the emergency call has been ini-
tiated, the indicator lamp in the SOS button
flashes. The Connecting Call
message
appears in the multifunction display.
The audio output is muted. Once the connection has been made, the
Call Connected
message appears in the
multifunction display.
All important information on the emergency is
transmitted, for example: R
current location of the vehicle (as deter-
mined by the GPS system) R
vehicle identification number R
information on the severity of the accident
Shortly after the emergency call has been ini-
tiated, a voice connection is automatically
established between the Customer Assis-
tance Center and the vehicle occupants. R
If the vehicle occupants respond, the
Mercedes-Benz Customer Assistance Cen-
ter attempts to get more information on the
emergency. R
If there is no response from the vehicle
occupants, an ambulance is immediately
sent to the vehicle.
If no voice connection can be established to
the Mercedes-Benz Customer Assistance
Center, the system has been unable to initiate
an emergency call.
This can occur, for example, if the relevant
mobile phone network is not available. The
indicator lamp in the SOS button flashes con-
tinuously.
The Call Failed message appears in the
multifunction display and must be confirmed.
In this case, summon assistance by other
means.
Making an emergency call Features 283
Stowage and features Z

Magnetic field zone maps North America
South America
Floormats
G WARNING
Objects in the driver's footwell can restrict the
pedal travel or obstruct a depressed pedal.
The operating and road safety of the vehicle is
jeopardized. There is a risk of an accident.
Make sure that all objects in the vehicle are
stowed correctly, and that they cannot enter the driver's footwell. Install the floormats
securely and as specified in order to ensure
sufficient clearance for the pedals. Do not use
loose floormats and do not place floormats on
top of one another.
X
Slide the seat backwards. X
To install: place the floormat in the foot-
well. X
Press safety catch knobs C onto retain-
ers D . X
To remove: pull the floormat off retain-
ers D . X
Remove the floormat.294
Features
Stowage and features

Example: engine oil cap X
Turn cap C counter-clockwise and remove
it. X
Add engine oil.
If the oil level is at or below the MIN mark on
the oil dipstick, add 1.1 US qt (1.0 l) of
engine oil. X
Replace cap C on the filler neck and turn
clockwise.
Ensure that the cap locks into place
securely. X
Check the oil level again with the oil dip-
stick ( Y
page 298).
Further information on engine oil
( Y
page 368).
Checking and adding other service
products
Checking coolant level
G WARNING
The cooling system is pressurized, particularly
when the motor is warm. If you open the cap,
you could be scalded if hot coolant sprays out.
There is a risk of injury.
Let the engine cool down before you open the
cap. Wear gloves and eye protection. Slowly
open the cap to relieve pressure.
! The coolant may only be checked and cor-
rected when the engine is cool (coolant
temperature below 104 ‡ (40 †). Check-
ing the coolant when the coolant tempera-
ture is above 104 ‡ (40 †) may result in
damage to the engine or to the engine cool-
ing system. Example X
Park the vehicle on a level surface.
Only check the coolant level when the vehi-
cle is on a level surface and the engine has
cooled down. X
Turn the SmartKey to position 2 in the igni-
tion lock ( Y
page 147). X
Check the coolant temperature display in
the instrument cluster.
The coolant temperature must be below
104 ‡ (40 †). X
Turn the SmartKey to position 0 in the igni-
tion lock ( Y
page 147). X
Slowly turn cap C counter-clockwise and
to relieve excess pressure. X
Turn cap C further counter-clockwise and
remove it.
If the coolant is at the level of marker bar