ECU MERCEDES-BENZ CLA 2016 Owner's Guide

Display messages
Possible causes/consequences and P Solutions
Collision Preven ‐
tio n Assist Plu s
Inoperative COLLISION PREVENTION ASSIST PLU S is temporarily inoperative
due to a malfunction . Adaptive Brake Assis t may also hav e failed.X
Visit a qualified specialist workshop immediately.
Radar Sensor s
Dirty See Opera‐
tor's Manual At leas t on e of th e following drivin g systems or drivin g safet y sys-
tems is temporarily restricted or inoperative: R
COLLISION PREVENTION ASSIST PLU SR
DISTRONIC PLU S
Possibl e causes are: R
th e sensor s in th e radiato r trim and/o r in th e bumpers are dirtyR
th e function of th e drivin g system and/o r drivin g safet y system
is impaire d due to heav y rain or snow.
A warnin g tone also sounds.
Whe n th e causes state d abov e no longer apply, th e display mes -
sage disappears. Al l drivin g systems and drivin g safet y systems
are operative again .
If th e display message does no t disappear :X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 169).X
Switc h of f th e engine.X
Clean th e sensor s in th e following location s ( Y
page 305):R
in th e radiato r trim R
in th e fron t bumper R
in th e rear bumper, particularl y in th e middle of th e rear
bumper X
Restart th e engine.
The display message disappears.
u SRS Malfunction
Servic e Required The restrain t system is faulty. The u warnin g lamp also lights
up in th e instrumen t cluster.
G WARNIN G
The air bags or Emergency Tensioning Devices may either be trig-
gered unintentionally or, in th e event of an accident, may no t be
triggered .
There is an increase d ris k of injury.X
Visit a qualified specialist workshop immediately.
Fo r further information about th e restrain t system, see
( Y
page 42) . Display messages 23 5
On-board computer and displays Z

Display messages
Possible causes/consequences and P Solutions
Front Passenger
Airbag Disabled
See Operator' s Man ‐
ual The front-passenger air bag and front-passenger knee bag are
deactivated during th e journey, although:R
an adult
or R
a person of th e correspondin g stature is on th e front-passenger
seat
If additional forces are applied to th e seat , th e system may inter-
pre t th e occupant's weight as lowe r than it actually is.
G WARNIN G
The front-passenger fron t air bag and fron t passenger knee bag
may no t be triggered in th e event of an accident.
There is an increase d ris k of injury.X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 169).X
Switc h th e ignition off. X
Hav e th e occupant get out of th e vehicle.X
Kee p th e seat unoccupied , close th e front-passenger doo r and
switch on th e ignition .X
Observ e th e PASSENGER AI R BA G indicato r lamp s in th e center
console and th e multifunction display and chec k th e following :
Seat unoccupied and ignition switched on :R
a self-diagnosi s is carrie d out . The PASSENGER AI R BA G OF F
and PASSENGER AI R BA G ON indicato r lamp s mus t ligh t up
simultaneousl y fo r approximately six s econdsR
th e PASSENGER AI R BA G OF F indicato r lamp mus t then ligh t
up and remain lit after th e self-diagnosis. If th e indicato r lamp
is on , OCS (Occupant Classification System) has disabled th e
front-passenger fron t air bag and front-passenger knee bag
( Y
page 51) R
th e Front Passenger Air Bag Enable d See Opera‐
tor's Manual or Front Passenger Air Bag Disabled
See Operator' s Manual display message s mus t no t be
shown in th e multifunction displayX
Wait fo r a period of at leas t 60 seconds until th e necessar y sys-
te m checks hav e been completed.X
Mak e sur e that th e display message s do no t appea r in th e mul-
tifunction display.
If these condition s are fulfilled , th e front-passenger seat can be
occupied again . Whether th e PASSENGER AI R BA G OF F or ONDisplay messages 23 7
On-board computer and displays Z

Display messages
Possible causes/consequences and P Solutions
indicato r lamp remain s lit or goe s out depend s on how OCS clas-
sifies th e occupant .
If th e condition s are no t fulfilled , th e system is no t operating cor-
rectly. X
Visit a qualified specialist workshop immediately.
Fo r further information about th e Occupant Classification System,
see ( Y
page 51) .
Front Passenger
Airbag Enable d See
Operator' s Manual The front-passenger air bag and front-passenger knee bag are
enabled during th e journey, eve n though :R
a child, a small adult or an objec t weighin g less than th e sys-
tem' s weight threshold is locate d on th e front-passenger seat
or R
th e front-passenger seat is unoccupied
The system may detec t objects or forces applying additional
weight on th e seat .
G WARNIN G
The front-passenger fron t air bag and front-passenger knee bag
may be triggered unintentionally.
There is an increase d ris k of injury.X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 169).X
Switc h th e ignition off. X
Ope n th e front-passenger door. X
Remove th e child and th e child restrain t system from th e front-
passenger seat .X
Mak e sur e that there are no objects on th e seat addin g to th e
weight .
The system may otherwise detec t th e additional weight and
interpret th e seat occupant's weight as greate r than it actually
is. X
Kee p th e seat unoccupied , close th e front-passenger doo r and
switch on th e ignition .X
Observ e th e PASSENGER AI R BA G indicato r lamp s in th e ce nter
console and th e multifunction display and chec k th e following :238
Display messages
On-board computer and displays

Display messages
Possible causes/consequences and P Solutions
= Sto p Vehicl e See
Operator' s Manual The battery is no longer bein g charged and th e battery charg e level
is to o low.
A warnin g tone also sounds. X
Pull ove r and stop th e vehicl e safely and switch of f th e engine,
payin g attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 169).X
Observ e th e instruction s in th e display message = See
Operator' s Manual .X
Consult a qualified specialist workshop .

Display messages
Possible causes/consequences and P Solutions
Blind Spo t Assist
Currently Unavail‐
abl e See Opera‐
tor's Manual Blind Spot Assis t is temporarily inoperative.
Possibl e causes are: R
th e rada r sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radi o sta-
tion s or other source s of electromagnetic radiation .R
th e rada r sensor system is outside th e operating temperature
range.
The yello w c indicato r lamp s also ligh t up in th e exterio r mir -
rors.
Whe n th e causes state d abov e no longer apply, th e display mes -
sage disappears.
Blind Spot Assis t is operational again .
If th e display message does no t disappear :X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 169).X
Restart th e engine.
Blind Spo t Assist
Inoperative Blind Spot Assis t is defective.
The yello w c indicato r lamp s also ligh t up in th e exterio r mir -
rors. X
Visit a qualified specialist workshop .
Par k Assist Can ‐
celed The driver's doo r is open and th e driver's seat belt has no t been
fastened. X
Repea t th e parkin g process wit h th e seat belt fastene d and th e
driver's doo r closed .
You hav e inadvertentl y touched th e multifunction steerin g whee l
while steerin g intervention was active .X
Whil e steerin g intervention is active , mak e sur e that th e multi-
function steerin g whee l is no t touched unintentionally.
The vehicl e has started to skid and ES P ®
has intervened.X
Use Active Parking Assis t again later ( Y
page 195).Display messages 24 7
On-board computer and displays Z

Display messages
Possible causes/consequences and P Solutions
Par k Assist Inoper ‐
ative You hav e jus t carrie d out a larg e number of turning or parkin g
maneuvers .
Active Parking Assis t will become available again after approx -
imately te n minute s ( Y
page 195).X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Switc h of f and restar t th e engine.
If th e multifunction display still shows th e display message :X
Visit a qualified specialist workshop .
PARKTRONI C is defective. X
Visit a qualified specialist workshop .
Par k Assist Fin ‐
ished The vehicl e is parked. A warnin g tone also sounds.
The display message disappear s automatically.
DISTRONIC PLU S Off DISTRONIC PLU S has been deactivated ( Y
page 180).
If it was no t deactivated by th e driver , a warnin g tone also sounds.
DISTRONIC PLU S Now
Available DISTRONIC PLU S is operational again after havin g been tempo -
rarily unavailable . You can no w reactivat e DISTRONIC PLU S
( Y
page 180).
DISTRONIC PLU S Cur ‐
rently Unavailable
See Operator' s Man ‐
ual DISTRONIC PLU S is temporarily inoperative.
Possibl e causes are: R
th e rada r sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radi o sta-
tion s or other source s of electromagnetic radiation .R
th e system is outside th e operating temperature range.R
th e on-boar d voltag e is to o low.
A warnin g tone also sounds.
Whe n th e causes state d abov e no longer apply, th e display mes -
sage disappears.
DISTRONIC PLU S is operational again .
If th e display message does no t disappear :X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 169).X
Restart th e engine.248
Display messages
On-board computer and displays

Tires Display messages
Possible causes/consequences and P Solutions
Check Tire Pres‐
sure Soon Canada only:
The tire pressure loss warning system has detected a significant
loss in pressure.
A warning tone also sounds.
Possible causes: R
you have changed the positions of the wheels and tires or instal-
led new wheels and tires. R
the tire pressure in one or more tires has dropped
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
Check the tires and, if necessary, follow the instructions for a
flat tire ( Y
page 310). X
Check the tire pressures and, if necessary, correct the tire pres-
sure. X
Restart the tire pressure loss warning system when the tire
pressure is correct ( Y
page 336).
Check Tire Pres‐
sure Then Restart
Run Flat Indicator Canada only:
The tire pressure loss warning system generated a display mes-
sage and has not been restarted since. X
Set the correct tire pressure in all four tires. X
Restart the tire pressure loss warning system ( Y
page 336).
Run Flat Indicator
Inoperative Canada only:
The tire pressure loss warning system is faulty. X
Visit a qualified specialist workshop.250
Displa y messages
On-board computer and displays

Display messages
Possible causes/consequences and P Solutions
Please Correc t
Tir e Pressure US A only:
The tire pressur e is to o low in at leas t on e of th e tires , or th e tire
pressur e difference between th e wheels is to o great.X
Chec k th e tire pressures at th e next opportunity ( Y
page 336).X
If necessary, correc t th e tire pressure.X
Restart th e tire pressur e monitor ( Y
page 338).
Check Tires US A only:
The tire pressur e in on e or mor e tires has dropped significantly.
The whee l position appears in th e multifunction display.
A warnin g tone also sounds.
G WARNIN G
Tir e pressures that are to o low pos e th e following hazards :R
they may burst, especially as th e load and vehicl e speed
increase . R
they may wear excessivel y and/o r unevenly, whic h may greatl y
impair tire traction .R
th e drivin g characteristics , as well as steerin g and braking, may
be greatl y impaired.
There is a ris k of an accident. X
Stop th e vehicl e without makin g any sudden steerin g or brakin g
maneuvers . Pay attention to th e traffic condition s as you do so.X
Secur e th e vehicl e against rollin g away ( Y
page 169).X
Chec k th e tires and , if necessary, follow th e instruction s fo r a
flat tire ( Y
page 310). X
Chec k th e tire pressur e ( Y
page 336).X
If necessary, correc t th e tire pressure.Display messages 25 1
On-board computer and displays Z

Display messages
Possible causes/consequences and P Solutions
Warnin g Tir e Mal ‐
function US A only:
The tire pressur e in on e or mor e tires has dropped suddenly. The
whee l position appears in th e multifunction display.
G WARNIN G
Drivin g wit h a flat tire poses a ris k of th e following hazards :R
a flat tire affects th e abilit y to steer or brak e th e vehicle.R
you could los e control of th e vehicle.R
continued drivin g wit h a flat tire will caus e excessive heat build-
up and possibl y a fire.
There is a ris k of an accident. X
Stop th e vehicl e without makin g any sudden steerin g or brakin g
maneuvers . Pay attention to th e traffic condition s as you do so.X
Secur e th e vehicl e against rollin g away ( Y
page 169).X
Chec k th e tires and , if necessary, follow th e instruction s fo r a
flat tire ( Y
page 310).
Tir e Press. Moni‐
tor Currently
Unavailable US A only:
Becaus e there is interferenc e from a stron g source of radi o waves,
no signal s from th e tire pressur e sensor s are detected. The tire
pressur e monitor is temporarily malfunctioning. X
Drive on .
The tire pressur e monitor restarts automatically as soo n as th e
problem has been resolved.
TirePress . Sen ‐
sor(s) Missin g US A only:
There is no signal from th e tire pressur e sensor of on e or several
wheels. The pressur e of th e affecte d tire does no t appea r in th e
multifunction display. X
Hav e th e fault y tire pressur e sensor replaced at a qualified spe -
cialist workshop .
Tir e Pressure Mon ‐
ito r Inoperative
No Wheel Sensor s US A only:
The wheels mounted do no t hav e a suitable tire pressur e sensor .
The tire pressur e monitor is deactivated.X
Moun t wheels wit h suitable tire pressur e sensors.
The tire pressur e monitor is activated automatically after drivin g
fo r a few minutes.
Tir e Press. Moni‐
tor Inoperative US A only:
The tire pressur e monitor is faulty.X
Visit a qualified specialist workshop .252
Display messages
On-board computer and displays

Display messages
Possible causes/consequences and P Solutions
Servic e Required
Do Not Shift Gears
Visit Dealer You canno t chang e th e transmissio n position due to a malfunction .
A warnin g tone also sounds.
If transmissio n position D is selected:X
Drive to a qualified specialist workshop without shiftin g th e
transmissio n from position D .
If transmissio n position R , N or P is selected:X
Secur e th e vehicl e against rollin g away ( Y
page 169).X
Notify a qualified specialist workshop or breakdown service.
Onl y Shift to 'P'
whe n Vehicl e is
Stationar y The vehicl e is moving. X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Shift th e transmissio n to position P .
Reversing Not Pos ‐
sible Servic e
Required The automati c transmissio n is malfunctioning. You canno t bac k
up. X
Visit a qualified specialist workshop .
Transmission Mal ‐
function The automati c transmissio n is malfunctioning.X
Visit a qualified specialist workshop .
Transmission Mal ‐
function Sto p The automati c transmissio n is malfunctioning.X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 169).X
Consult a qualified specialist workshop .
Sto p Vehicl e Shift
to 'P' Leave
Engine Runnin g The automati c transmissio n has overheated.X
Drive on carefully.
The automati c transmissio n is available again when th e display
message goe s out .
If th e multifunction display still shows th e display message :X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 169).X
Wait until th e automati c transmissio n has cooled down and th e
display message has disappeared.254
Display messages
On-board computer and displays