ECU MERCEDES-BENZ CLA-Class 2017 C117 Owner's Guide

If Distance Pilot DISTRONIC detects a faster-
moving vehicle in front, it increases the driving
speed. However, the vehicle is only accelerated
up to the speed you have stored.
iDistance Pilot DISTRONIC is deactivated
when you depress the brake, except when the vehicle is stationary.
Selecting the drive program
Distance Pilot DISTRONIC supports a sporty
driving style when you select the S+drive pro-
gram (Mercedes-AMG vehicles only), S
(
Ypage 133) or the manual drive program
(Ypage 135). Acceleration behind the vehicle in
front or to the set speed is then noticeably more
dynamic. If you have selected the E(Mercedes-
AMG vehicles: C) drive program, the vehicle
accelerates more gently. This setting is recom-
mended in stop-and-start traffic.
Changing lanes
If when driving on multilane roads you wish to
change to the overtaking lane, Distance Pilot
DISTRONIC supports you if:
Ryou are driving faster than 45 mph (70 km/h)
RDistance Pilot DISTRONIC is maintaining the
distance to a vehicle in front
Ryou switch on the appropriate turn signal
RDistance Pilot DISTRONIC does not currently
detect a danger of collision
If these conditions are fulfilled, your vehicle is
accelerated. Acceleration will be interrupted if
changing lanes takes too long or if the distance
between your vehicle and the vehicle in front
becomes too small.
Stopping
If Distance Pilot DISTRONIC detects that the
vehicle in front is stopping, it brakes your vehicle
until it is stationary.
Once your vehicle is stationary, it remains sta-
tionary and you do not need to depress the
brake.
iAfter a time, the electric parking brake
secures the vehicle and relieves the service
brake.
iDepending on the specified minimum dis-
tance, your vehicle will come to a standstill at a sufficient distance behind the vehicle in
front. The specified minimum distance is set
using the control on the cruise control lever. When Distance Pilot DISTRONIC is activated,
the transmission is shifted automatically to
position
Pif:
Rthe driver's seat belt is not fastened and the
driver's door is open.
Rthe engine is switched off, u nless it is auto-
matically switched off by the ECO start/stop
function.
The electric parking brake secures the vehicle
automatically if Distance Pilot DISTRONIC is
activated when the vehicle is stationary and:
Ra system malfunction occurs.
Rthe power supply is insufficient.
If a malfunction occurs, the transmission may
also shift into position Pautomatically.
Setting a speed
Keep in mind that it may take a brief moment
until the vehicle has accelerated or braked to
the speed set.
XPress the cruise control lever up :for a
higher speed or down ;for a lower speed.
XTo adjust the set speed in1 mphincre-
ments (1 km/hincrements): briefly press
the cruise control lever up :or down ;to
the pressure point.
The last stored speed increases or decreases in 1 mph (1 km/h) increments.
XTo adjust the set speed in5 mphincre-
ments (10 km/hincrements): briefly press
the cruise control lever up :or down ;to
the pressure point.
The last stored speed increases or decreases in 5 mph (10 km/h) increments.
iDistance Pilot DISTRONIC is not deactivated
if you depress the accelerator pedal. If you
accelerate to overtake, Distance Pilot
DISTRONIC adjusts the vehicle's speed to the
last speed stored after you have finished over- taking.
Setting a specified minimum distance
You can set the specified minimum distance for
Distance Pilot DISTRONIC by varying the time
span between one and two seconds. With this
function you can set the minimum distance that
Distance Pilot DISTRONIC maintains to the vehi-
cle in front, dependent on vehicle speed. You
can see this distance in the multifunction dis-
play (
Ypage 154).
Driving systems153
Driving and parking
Z

The specified minimum distance can be
changed while Distance Pilot DISTRONIC is
switched on or off.
iMake sure that you maintain the minimum
distance to the vehicle in front as required by
law. Adjust the distance to the vehicle in front
if necessary.
XTo increase: turn control=in direction ;.
Distance Pilot DISTRONIC then maintains a
greater distance between your vehicle and
the vehicle in front.
XTo decrease: turn control=in direction :.
Distance Pilot DISTRONIC then maintains a
shorter distance between your vehicle and
the vehicle in front.
Deactivating Distance Pilot DISTRONIC
There are several ways to deactivate Distance
Pilot DISTRONIC:
XBriefly press the cruise control lever for-
wards :.
or
XBrake, unless the vehicle is stationary
When you deactivate Distance Pilot DISTRONIC,
the Distance Pilot Off
message appears in the multifunction display for approximately five
seconds.
iThe last speed stored remains stored until
you switch off the engine. Distance Pilot
DISTRONIC is not deactivated if you depress
the accelerator pedal.
Distance Pilot DISTRONIC is automatically deac-
tivated if:
Ryou engage the electric parking brake or if the
vehicle is automatically secured with the elec-
tric parking brake
RESP®intervenes or you deactivate ESP®
Rthe transmission is in the P,Ror Nposition
Ryou pull the cruise control lever towards you
in order to pull away and the front-passenger
door or one of the rear doors is open
Rthe vehicle is skidding
Ryou switch on Parking Pilot
If Distance Pilot DISTRONIC is automatically
deactivated, you will hear a warning tone. The
Distance Pilot Off
message appears in the
multifunction display for approximately five sec- onds.
Distance Pilot DISTRONIC is automatically deac-
tivated if you activate DSR. The ÃDSR sym-
bol appears in the multifunction display.
Distance Pilot DISTRONIC displays in
the instrument cluster
Displays in the speedometer
When Distance Pilot DISTRONIC is activated and
there are no vehicles detected in front, one or
two segments ;in the speed range set light up.
If Distance Pilot DISTRONIC detects a vehicle in
front, segments ;between speed of the vehi-
cle in front =and stored speed :light up.
154Driving systems
Driving and parking

HOLD function
General notes
The HOLD function can assist the driver in the
following situations:
Rwhen pulling away, especially on steep slopes
Rwhen maneuvering on steep slopes
Rwhen waiting in traffic
The vehicle is kept stationary without the driver having to depress the brake pedal.
The braking effect is canceled and the HOLD
function deactivated when you depress the
accelerator pedal to pull away.
Important safety notes
GWARNING
When leaving the vehicle, it can still roll away despite being braked by the HOLD function if:
Rthere is a malfunction in the system or in
the voltage supply.
Rthe HOLD function has been deactivated by
pressing the accelerator pedal or the brake
pedal, e.g. by a vehicle occupant.
Rthe electrical system in the engine com-
partment, the battery or the fuses have
been tampered with.
Rthe battery is disconnected
There is a risk of an accident.
If you wish to exit the vehicle, always turn off the HOLD function and secure the vehicle
against rolling away.
!When Distance Pilot DISTRONIC or the
HOLD function is activated, the vehicle
brakes automatically in certain situations.
To avoid damage to the vehicle, deactivate
Distance Pilot DISTRONIC and the HOLD
function in the following or similar situations:
Rwhen towing the vehicle
Rin the car wash
Deactivating the HOLD function (
Ypage 156).
Activation conditions
You can activate the HOLD function if:
Rthe vehicle is stationary
Rthe engine is running or if it has been auto-
matically switched off by the ECO start/stop
function
Rthe driver's door is closed or your seat belt is
fastened
Rthe electric parking brake is released
RDistance Pilot DISTRONIC is deactivated
Rthe transmission position D,R or Nis engaged
while driving a vehicle with an automatic
transmission
Activating the HOLD function
XMake sure that the activation conditions are
met.
XDepress the brake pedal.
XQuickly depress the brake pedal further
until :appears in the multifunction display.
The HOLD function is activated. You can
release the brake pedal.
iIf depressing the brake pedal the first time
does not activate the HOLD function, wait
briefly and then try again.
Deactivating the HOLD function
The HOLD function is deactivated automatically
if:
Ryou accelerate. On vehicles with automatic
transmission: only when the transmission is in
position Dor R.
Rthe transmission is in position Pon vehicles
with automatic transmission.
Ryou depress the brake pedal again with a cer-
tain amount of pressure until :disappears
from the multifunction display.
Ryou activate Distance Pilot DISTRONIC.
Ryou secure the vehicle using the electric park- ing brake.
156Driving systems
Driving and parking

iAfter a time, the electric parking brake
secures the vehicle and relieves the service
brake.
When the HOLD function is activated, the trans-
mission is shifted automatically to position Pif:
Rthe driver's seat belt is not fastened and the
driver's door is open.
Rthe engine is switched off, unless it is auto-
matically switched off by the ECO start/stop
function.
The electric parking brake secures the vehicle
automatically if the HOLD function is activated
when the vehicle is stationary and:
Ra system malfunction occurs.
Rthe power supply is insufficient.
Start-off assist (except Mercedes-
AMG vehicles)
Important safety notes
GWARNING
If you use start-off assist, individual wheels
may start to spin and the vehicle may skid. If
ESP
®is deactivated, there is a greater danger
of skidding and having an accident. Make sure
that no persons or obstacles are in the vicinity
of the vehicle.
Start-off assist enables optimum acceleration
from a standstill. For this, a suitably high-grip
road surface is required, along with the tires and vehicle being in proper operating condition.
Do not activate start-off assist on public roads.
Observe the safety notes on driving safety sys-
tems (
Ypage 60).
Be sure to read the safety notes and information
on ESP
®(Ypage 63).
Activating start-off assist
XDeactivate ESP®(Ypage 182).
XTurn the steering wheel to the straight-ahead
position.
XDepress the brake pedal hard with your left
foot and keep it depressed.
XShift the transmission to position D.
XUse the DYNAMIC SELECT button to select
the Sdrive program (Ypage 127).
XQuickly depress the accelerator pedal fully.
XTake your foot off the brake, but keep the
accelerator pedal depressed.
The vehicle pulls away at maximum acceler-
ation.
iActivate ESP®as soon as the acceleration
process has ended. ESP®will otherwise not
be able to stabilize the vehicle if the vehicle
starts to skid or a wheel starts to spin.
Canceling start-off assist
XRemove your foot from the accelerator pedal.
XReactivate ESP®.
RACE START (Mercedes-AMG vehi-
cles)
Important safety notes
iRACE START must not be used on normal
roads. RACE START must only be activated
and used on dedicated road circuits, outside
of public road use.
iRACE START is only available in
Mercedes‑AMG vehicles.
GWARNING
If you use RACE START, individual tires may
start to spin and the vehicle could skid.
Depending on the selected ESP
®mode, there
is an increased risk of skidding and having an accident. Make sure that no persons, animals
or obstacles are within range of the vehicle.
RACE START enables optimal acceleration from
a standing start. For this, a suitably high-grip
road surface is required, along with the tires and
vehicle being in proper operating condition.
iObserve the safety notes on driving safety
systems (Ypage 60).
Be sure to read the safety notes and informa- tion on ESP
®(Ypage 63).
Conditions for activation
You can activate RACE START if:
Rthe doors, hood and the trunk lid are closed.
Rthe engine is running and the transmission,
all-wheel drive clutch and the engine are at
operating temperature.
Driving systems157
Driving an d parking
Z

Rthat are parallel to the direction of travel andat least 39.5 in (1.0 m)longer than your vehi-
cle
Rthat are at right angles to the direction of
travel and at least 39.5 in (1.0 m) wider than
your vehicle
iNote that Parking Pilot cannot measure the
length of a parking space if it is at right angles to the direction of travel. You will need to
judge whether your vehicle will fit into the
parking space.
When driving at speeds below 19 mph
(30 km/h), you will see parking symbol ;as a
status indicator in the instrument cluster. When
a parking space has been detected, an arrow
towards the right or the left also appears. Park-
ing Pilot only displays parking spaces on the
front-passenger side as standard. Parking
spaces on the driver's side are displayed as
soon as the turn signal on the driver's side is
activated. When parking on the driver's side,
this must remain activated until you confirm the
use of Parking Pilot by pressing the abutton
on the multifunction steering wheel. The system
automatically determines whether the parking
space is parallel or at right-angles to the direc-
tion of travel.
A parking space is displayed while you are driv-
ing past it, and until you are approximately 50 ft
(15 m) away from it.
Parking
GWARNING
If you leave the vehicle when it is only being
braked by Parking Pilot, it could roll away if:
Rthere is a malfunction in the system or in
the voltage supply.
Rthe electrical system in the engine com-
partment, the battery or the fuses are tam-
pered with.
Rthe battery is disconnected.
Rthe vehicle is accelerated, e.g. by a vehicle
occupant.
There is a risk of an accident.
Before leaving the vehicle, always secure it
against rolling away.
iIf Parking Assist PARKTRONIC detects
obstacles, Parking Pilot brakes automatically whilst the vehicle is parking. You are respon-
sible for braking in good time.
XStop the vehicle when the parking space sym-
bol shows the desired parking space in the
instrument cluster.
XShift the transmission to position
R.
The Start Parking Pilot?
Yes: OKNo:% message appears in the multifunction
display.
XTo cancel the procedure: press the%
button on the multifunction steering wheel or
pull away.
or
XTo park using Parking Pilot: press thea
button on the multifunction steering wheel.
The Parking Pilot Active Accelerate
and BrakeObserve Surroundingsmes-
sage appears in the multifunction display.
XLet go of the multifunction steering wheel.
XBack up the vehicle, being ready to brake at all
times. When backing up, drive at a speed
below approximately 6 mph (10 km/h). Oth-
erwise Parking Pilot is canceled.
Parking Pilot brakes the vehicle to a standstill
when the vehicle approaches the rear border
of the parking space.
Maneuvering may be required in tight parking
spaces.
The Parking Pilot Active Select D
Observe Surroundingsmessage appears in
the multifunction display.
XShift the transmission to position Dwhile the
vehicle is stationary.
Parking Pilot immediately steers in the other
direction.
The Parking Pilot Active Accelerate
and BrakeObserve Surroundingsmes-
sage appears in the multifunction display.
iYou will achieve the best results by waiting
for the steering procedure to complete before
pulling away.
XDrive forwards and be ready to brake at all
times.
Parking Pilot brakes the vehicle to a standstill when the vehicle approaches the front border
of the parking space.
Maneuvering may be required in tight parking spaces.
The Parking Pilot Active Select R
Observe Surroundingsmessage appears in
the multifunction display.
164Driving systems
Driving and parking

Displaying therange an dcurrent fuel
consumption
Mercedes-AMG vehicles :th emen uonly shows
range :.
XPress th e= or; buttonon th esteerin g
whee lto selec tth eTri pmenu.
XPress 9or: to selec tth edisplay wit h
approximat erange :and curren tfue lcon-
sumption ;.
Approximat erange :that can be covered is
calculated accordin gto your curren tdrivin g
style and th eamount of fue lin th etank .If
there is only asmall amount of fue llef tin th e
fue ltank , avehicle bein grefuele dC
appears instead of approximat erange :.
Recuperation display =shows you if energ y
has bee nrecuperated from th ekineti cenerg y
in overrun mode and saved in th ebattery.
Recuperation display =depend son th e
engin einstalled and is therefore no tavailable
in all vehicles .
Digital speedometer
XPress the= or; buttonon th esteerin g
whee lto selec tth eTri pmenu.
XPress th e9 or: buttonto selec tth e
digita lspeedometer ;.
A gear shift recommendation :Zcan also
follow .
Observ eth einformation on gearshift recom -
mendation :when shiftin gmanually
(
Ypage 135).
Mercedes-AMG vehicles : agearshift recom -
mendation is shown in th estatus bar of th emultifunction display and no
tin th edigita l
speedometer display.
Resetting value s
XPress the= or; buttonon th esteerin g
whee lto selec tth eTri pmenu.
XPress th e9 or: buttonto selec tth e
function that you wish to reset .
XPressato confirm .
XPress:to selec tYesand press ato
confirm .
You can reset th evalues of th efollowin gfunc-
tions:
RTrip odometer
R"From Start "trip compute r
R"From Reset" trip compute r
RECOdisplay
If you reset th evalues in th eEC Odisplay, th e
values in th e"From Start "trip compute rare also
reset .If you reset th evalues in th e"From Start "
trip computer, th evalues in th eEC Odisplay are
also reset .
Navigation syste mmenu
Displaying navigation instructions
In th eNav imenu, th emultifunction display
shows navigation instructions.
You can fin dfurther information on navigation in
th eseparat emultimedia system operatin g
instructions.
XSwitc hon th emultimedia system (se esepa-
rat eoperatin ginstructions).
XPress th e= or; buttonon th esteerin g
whee lto selec tth eNav imenu.
Route guidance not active
:Direction of trave l
;Currentroad
178Menus and submenus
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
The yellow!warning lamp and th ered F (USAonly) or !
(Canada only) indicator lamp ligh tup.
The electric parking brak eis malfunctioning .
To release:
XSwitc hoff th eignition and tur nit bac kon .
XReleas eth eelectric parking brak emanually.
or
XReleas eth eelectric parking brak eautomatically (Ypage 141).
If th eelectric parking brak estill canno tbe released:
XDo no tdrive on .
XConsult aqualified specialist workshop .
The redF(USAonly) or !(Canada only) indicator lamp flashes
and th eyellow !warning lamp lights up.
The electric parking brak eis malfunctioning .
To release:
XSwitc hoff th eignition and tur nit bac kon .
XReleas eth eelectric parking brak emanually.
To apply :
XSwitchoff th eignition and tur nit bac kon .
XApply th eelectric parking brak emanually.
If th ered F (USAonly) or !(Canada only) indicator lamp con-
tinue sto flash:
XDo no tdrive on .
XSecureth evehicl eagainst rollin gaway (Ypage 302).
XShift th etransmission to position P.
XTurn thefron twheels toward sth ecurb.
XConsult aqualified specialist workshop .
192Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
The yellow!warning lamp lights up and th ered F (USAonly)
or ! (Canada only) indicator lamp flashes .
It is no tpossibl eto apply th eelectric parking brak emanually.
XShift th etransmission to position P.
XVisitaqualified specialist workshop .
$(USA
only)
J( Canada
only)
Check Brake Fluid
Level
There is no tenough brak efluid in th ebrak efluid reservoir .
A warning tone sounds. The $(USAonly) or J(Canada only)
warning lamp sin th einstrumen tcluste rmay also ligh tup.
GWARNIN G
The braking effec tmay be impaired.
There is aris kof an accident.
XPull ove rand stop th evehicl esafely as soo nas possible, payin g
attention to roa dand traffic conditions. Do no tcontinu edrivin g
under any circumstances.
XSecur eth evehicl eagainst rollin gaway (Ypage 140).
XConsult aqualified specialist workshop .
XDo notadd brak efluid .This does no tcorrec tth emalfunction .
#
CheckBrakePadWear
The brak epads/linings hav ereached their wear limit.
XVisit aqualified specialist workshop .
G
Inoperative
Oneor mor emain features of th embrace system are malfunctioning .
XVisitaqualified specialist workshop .
ActiveBrakeAssistFunctionsCurrentlyLimitedSee Opera‐tor's Manual
Active Brake Assis tis temporarily inoperative.
Possibl ecauses are:
Rth eradar sensor system is temporarily inoperative, e.g. due to elec -
tromagneti cradiation emitted by nearby TV or radi ostation sor
other source sof electromagneti cradiation
Rth esystem is outside th eoperating temperature range
Rth eon-boar dvoltag eis to olow
Whe nth ecauses state dabov eno longer apply, th edisplay message
disappears.
Active Brake Assis tis operational again .
If th edisplay message does no tdisappear :
XPull overand stop th evehicl esafely as soo nas possible, payin g
attention to roa dand traffic conditions.
XSecur eth evehicl eagainst rollin gaway (Ypage 140).
XRestart th eengine.
Active BrakeAssist :SystemInop‐erative
Active Brake Assis tis unavailable due to amalfunction .Situation -
dependen tparking assistanc emay also hav efailed.
XVisit aqualified specialist workshop immediately.
194Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
RadarSensorsDirtySee Operator' sMan ‐ual
The radar sensor system is malfunctioning .
Possibl ecauses are:
RDirt on sensor s
RHeavy rain or snow
RWhendrivin gon inter-urban roads without traffic or infrastructure,
e.g. in desert-like area s
At least on edrivin gsystem or drivin gsafet ysystem is malfunctioning
or is temporarily unavailable :
RActive Brake Assist
RDistancePilo tDISTRONI C
A warning tone also sounds.
Once th ecaus eof th eproblem is no longer present, th edrivin gand
drive safet ysystems will be available again .The display message dis-
appears.
If th edisplay message does no tdisappear :
XPull overand stop th evehicl esafely as soo nas possible, payin g
attention to roa dand traffic conditions.
XSecur eth evehicl eagainst rollin gaway (Ypage 140).
XSwitchoff th eengine.
XClean all sensor s (Ypage 262).
XRestart theengine.
The display message disappears.
6
SRSMalfunctionSer ‐viceRequired
The restrain tsystem is malfunctioning .The 6 warning lamp also
lights up in th einstrumen tcluster.
GWARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th eevent of an accident, may no tbe triggered .
There is an increased ris kof injury.
XVisit aqualified specialist workshop immediately.
Fo rfurther information about th erestrain tsystem, see (
Ypage 39).
6
Front Lef tMalfunc‐tio nServic eRequiredorFrontRight MalfunctionServic eRequired
The restrain tsystem is malfunctioning at th efron ton th elef tor right .
The 6 warning lamp also lights up in th einstrumen tcluster.
GWARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th eevent of an accident, may no tbe triggered .
There is an increased ris kof injury.
XVisit aqualified specialist workshop immediately.
Display messages19 5
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
6
RearLef tMalfunc‐tio nServic eRequiredorRea rRight MalfunctionServic eRequired
The rear left-han dor right-hand restrain tsystem is malfunctioning .
The 6 warning lamp also lights up in th einstrumen tcluster.
GWARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th eevent of an accident, may no tbe triggered .
There is an increased ris kof injury.
XVisit aqualified specialist workshop immediately.
6
Lef tSid eCurtai nAirbag MalfunctionServiceRequiredor
Right Sid eCurtai n
Airbag MalfunctionServiceRequired
The left-han dor right-hand window curtai nair bag is malfunctioning .
The 6 warning lamp also lights up in th einstrumen tcluster.
GWARNIN G
The lef tor right window curtai nair bag may either be triggered unin-
tentionally or, in th eevent of an accident, may no tbe triggered .
There is an increased ris kof injury.
XVisit aqualified specialist workshop immediately.
196Display messages
On-board computer and displays