ECU MERCEDES-BENZ CLA 2019 Service Manual

Tires
Display messagesPossible causes/consequences andPPSolutions
CheckCheckTireTirePressurePressureSoonSoonCanada only:
The tire pressure loss warning system has detected a significant lossin pressure.
A warning tone also sounds.
Possible causes:
Ryou have changed the positions of the wheels and tires or installednew wheels and tires
Rthe tire pressure in one or more tires has dropped
GWARNING
Tire pressures that are too low pose the following hazards:
Rthey may burst, especially as the load and vehicle speed increase.
Rthey may wear excessively and/or unevenly, which may greatlyimpair tire traction.
Rthe driving characteristics, as well as steering and braking, may begreatly impaired.
There is a risk of an accident.
XStop the vehicle without making any sudden steering or brakingmaneuvers. Pay attention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 142).
XCheck the tires and, if necessary, follow the instructions for a flattire (Ypage 274).
XCheck the tire pressures and, if necessary, correct the tire pressure.
XRestart the tire pressure loss warning system when the tire pres-sure is correct (Ypage 297).
CheckCheckTireTirePressurePressureThen Restart RunThen Restart RunFlat IndicatorFlat Indicator
Canada only:
The tire pressure loss warning system generated a display messageand has not been restarted since.
XSet the correct tire pressure in all four tires.
XRestart the tire pressure loss warning system (Ypage 297).
Run Flat IndicatorRun Flat IndicatorInoperativeInoperativeCanada only:
The tire pressure loss warning system is faulty.
XVisit a qualified specialist workshop.
PleasePleaseCorrectCorrectTireTirePressurePressureUSA only:
The tire pressure is too low in at least one of the tires, or the tirepressure difference between the wheels is too great.
XCheck the tire pressures at the next opportunity (Ypage 297).
XIf necessary, correct the tire pressure.
XRestart the tire pressure monitor (Ypage 300).
Displaymessages213
On-b oard computer and displays
Z

Display messagesPossible causes/consequences andPPSolutions
Check TiresCheck TiresUSA only:
The tire pressure in one or more tires has dropped significantly. Thewheel position appears in the multifunction display.
A warning tone also sounds.
GWARNING
Tire pressures that are too low pose the following hazards:
Rthey may burst, especially as the load and vehicle speed increase.
Rthey may wear excessively and/or unevenly, which may greatlyimpair tire traction.
Rthe driving characteristics, as well as steering and braking, may begreatly impaired.
There is a risk of an accident.
XStop the vehicle without making any sudden steering or brakingmaneuvers. Pay attention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 142).
XCheck the tires and, if necessary, follow the instructions for a flattire (Ypage 274).
XCheck the tire pressure (Ypage 297).
XIf necessary, correct the tire pressure.
Warning Tire Mal‐Warning Tire Mal‐functionfunctionUSA only:
The tire pressure in one or more tires has dropped suddenly. The wheelposition appears in the multifunction display.
GWARNING
Driving with a flat tire poses a risk of the following hazards:
Ra flat tire affects the ability to steer or brake the vehicle
Ryou could lose control of the vehicle
Rcontinued driving with a flat tire will cause excessive heat build-upand possibly a fire
There is a risk of an accident.
XStop the vehicle without making any sudden steering or brakingmaneuvers. Pay attention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 142).
XCheck the tires and, if necessary, follow the instructions for a flattire (Ypage 274).
TireTirePress.Press.MonitorMonitorCurrently Unavaila‐Currently Unavaila‐bleble
USA only:
Because there is interference from a strong source of radio waves, nosignals from the tire pressure sensors are detected. The tire pressuremonitor is temporarily malfunctioning.
XDrive on.The tire pressure monitor restarts automatically as soon as theproblem has been resolved.
214Displaymessages
On-b oard computer and displays

Display messagesPossible causes/consequences andPPSolutions
TransmissionTransmissionNotNotininP Risk of VehicleP Risk of VehicleRolling AwayRolling Away
The driver's door is open or not fully closed and the transmission is inposition^,\\or[.
A warning tone also sounds.
GWARNING
The vehicle may roll away.
There is a risk of an accident.
XShift the transmission to position].
XSecure the vehicle against rolling away (Ypage 142).
XClose the driver's door completely.
ServiceServiceRequiredRequiredDoDoNot Shift GearsNot Shift GearsVisit DealerVisit Dealer
You cannot change the transmission position due to a malfunction.
A warning tone also sounds.
If transmission position[is selected:
XDrive to a qualified specialist workshop without shifting the trans-mission from position[.
If position^,\\or]is selected:
XSecure the vehicle against rolling away (Ypage 142).
XNotify a qualified specialist workshop or breakdown service.
Only Shift to 'P'Only Shift to 'P'whenwhenVehicleVehicleisisSta‐Sta‐tionarytionary
The vehicle is moving.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XShift the transmission to position].
To Engage Trans‐To Engage Trans‐miss. Position Rmiss. Position RFirst Depress theFirst Depress theBrakeBrake
You have attempted to shift from position[or\\to position^.
XShift the transmission to position^with the brake pedaldepressed.
ReversingReversingNotNotPossi‐Possi‐blebleServiceServiceRequiredRequiredThe automatic transmission is malfunctioning. You cannot back up.
XVisit a qualified specialist workshop.
Transmission Mal‐Transmission Mal‐functionfunctionThe automatic transmission is malfunctioning.
XVisit a qualified specialist workshop.
Transmission Mal‐Transmission Mal‐function Stopfunction StopThe automatic transmission is malfunctioning.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 142).
XConsult a qualified specialist workshop.
216Displaymessages
On-b oard computer and displays

Display messagesPossible causes/consequences andPPSolutions
Stop Vehicle ShiftStop Vehicle Shiftto P Leave Engineto P Leave EngineRunningRunning
The automatic transmission has overheated.
XDrive on carefully.The automatic transmission is available again when the displaymessage goes out.
If the multifunction display still shows the display message:
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 142).
XWait until the automatic transmission has cooled down and the dis-play message has disappeared.
Auxiliary BatteryAuxiliary BatteryMalfunctionMalfunctionThe auxiliary battery for the automatic transmission is no longer beingcharged.
XVisit a qualified specialist workshop.
XUntil then, always shift the transmission to position]before youswitch off the engine.
XBefore leaving the vehicle, apply the electric parking brake.
Trans. Oil Overhea‐Trans. Oil Overhea‐ted Drive on withted Drive on withCareCare
Mercedes-AMG vehicles: the transmission oil has overheated.
Manual drive programcand the temporarily active manual driveprogram are no longer available. The engine power output is reduced.
XAllow the vehicle to cool down.
4matic Currently4matic CurrentlyUnavailableUnavailable4MATIC has overheated. The vehicle is only driven by the front wheels.
XDrive on.The airflow cools 4MATIC more quickly.
When the display message goes out, 4MATIC is available again andthe vehicle is driven by all four wheels.
4matic Inoperative4matic Inoperative4MATIC is malfunctioning. The vehicle is only driven by the frontwheels.
XVisit a qualified specialist workshop.

Safety systems
Warning/indicatorlamp
QQSignal type
Possible causes/consequences andPPSolutions
'MQ'(USA only),M(Canada only): the red brake system warning lamp is litwhile the engine is running. A warning tone also sounds.
GWARNING
The brake boosting effect is malfunctioning and the braking characteristics may beaffected.
There is a risk of an accident.
XPull over and stop the vehicle safely as soon as possible, paying attention to roadand traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 142).
XConsult a qualified specialist workshop.
XObserve the additional display messages in the multifunction display.
'MQ'(USA only),M(Canada only): the red brake system warning lamp is litwhile the engine is running. A warning tone also sounds.
There is not enough brake fluid in the brake fluid reservoir.
GWARNING
The braking effect may be impaired.
There is a risk of an accident.
XPull over and stop the vehicle safely as soon as possible, paying attention to roadand traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 142).
XDo not add brake fluid. Adding more will not correct the malfunction.
XConsult a qualified specialist workshop.
XObserve the additional display messages in the multifunction display.
Warning and indicator lamps in the instrument cluster221
On-board computer and displays
Z

Tires
Warning/indicatorlamp
QQSignal type
Possible causes/consequences andPPSolutions
wQThe 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.
GWARNING
Tire pressures that are too low pose the following hazards:
Rthey may burst, especially as the load and vehicle speed increase.
Rthey may wear excessively and/or unevenly, which may greatly impair tire trac-tion.
Rthe driving characteristics, as well as steering and braking, may be greatlyimpaired.
There is a risk of an accident.
XStop the vehicle without making any sudden steering or braking maneuvers. Payattention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 142).
XObserve the additional display messages in the multifunction display.
XCheck the tires and, if necessary, follow the instructions for a flat tire(Ypage 274).
XCheck the tire pressure (Ypage 297).
XIf necessary, correct the tire pressure.
wQThe yellow tire pressure monitor warning lamp (pressure loss/malfunction)flashes for approximately one minute and then remains lit.
The tire pressure monitor is faulty.
GWARNING
The system is possibly unable to recognize or register low tire pressure.
There is a risk of an accident.
XObserve the additional display messages in the multifunction display.
XVisit a qualified specialist workshop immediately.
230Warning and indicator lamps in the instrument cluster
On-board computer and displays

Connecting a mobile phone
(COMAND)
Requirements
For telephony via the Bluetooth®interface, you
require a Bluetooth®-capable mobile phone. Themobile phone must support Hands-Free Profile1.0 or above.
Multimedia system:
XSelectVehicleVehicle{System Set‐System Set‐tingstings{Activate BluetoothActivate Bluetooth.
XActivate Bluetooth®s.
Mobile phone:
XActivate Bluetooth®and, if necessary, Blue-
tooth®visibility for other devices (see themanufacturer's operating instructions).
The Bluetooth®device names for all of one man-ufacturer's products might be identical. Tomake it possible to clearly identify your mobilephone, change the device name (see the man-ufacturer's operating instructions).
If the mobile phone supports the PBAP (PhoneBookAccessProfile) and MAP (Message
AccessProfile) Bluetooth®profiles, the follow-ing information will be transmitted after youconnect:
RPhone book
RCall lists
RText messages and e-mail
iFurther information on suitable mobilephones can be found at:http://www.mercedes-benz.com/connect
iIn the USA, you can get in touch with theMercedes-Benz Customer Assistance Centeron 1-800-FOR-MERCedes (1-800-367-6372).
In Canada, you can get in touch with the Cus-tomer Relations Center on 1-800-387-0100.
Searching for and authorizing (connect-
ing) a mobile phone
Before using your mobile phone with the multi-media system for the first time, you will need tosearch for the phone and then authorize (con-nect) it. Depending on the mobile phone, author-ization either takes place by means of SecureSimple Pairing or by entering a passkey. Themultimedia system automatically makes the
procedure that is relevant for your mobile phoneavailable. The mobile phone is always connec-ted automatically after authorization. Furtherinformation on using a mobile phone with themultimedia system (see the Digital Operator'sManual).
If the multimedia system does not detect yourmobile phone, this may be due to particularsecurity settings on your mobile phone (see themanufacturer's operating instructions).
Only one mobile phone can be connected to themultimedia system at any one time.
Searching for a mobile phone
Multimedia system:
XSelectTel/Tel/

Authorization by entering a passkey (passcode):
XSelect the Bluetooth®name of the mobilephone.The input menu for the passkey is displayed.
XChoose a one to sixteen-digit number combi-nation as a passkey.
XEnter the passkey on the multimedia system.
XPressTto confirm.
XEnter and confirm the passkey on the mobilephone. 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 upto two minutes to be displayed (see the man-ufacturer's operating instructions).
Connecting a mobile phone (Audio 20)
Requirements
For telephony via the Bluetooth®interface, you
require at least one Bluetooth®-capable mobilephone depending on use ofone-telephonemodeortwo-telephone mode. The mobilephone must support Hands-Free Profile 1.0 orabove.
Intwo-telephone modeyou can use all thefunctions of the multimedia system with themain telephone. With theadditional tele-phone, you can receive incoming calls.
Multimedia system:
XSelectVehicleVehicle{System Set‐System Set‐tingstings{Activate BluetoothActivate Bluetooth.
XActivate Bluetooth®s.
Mobile phone:
XActivate Bluetooth®and, if necessary, Blue-
tooth®visibility for other devices (see themanufacturer's operating instructions).
The Bluetooth®device names for all of one man-ufacturer's products might be identical. Tomake it possible to clearly identify your mobilephone, change the device name (see the man-ufacturer's operating instructions).
If the mobile phone supports the PBAP (PhoneBookAccessProfile) and MAP (Message
AccessProfile) Bluetooth®profiles, the follow-ing information is transmitted after you connectthe main telephone:
RPhone book
RCall lists
RText messages and e-mail
iFurther information on suitable mobilephones can be found at:http://www.mercedes-benz.com/connect
iIn the USA, you can get in touch with theMercedes-Benz Customer Assistance Centeron 1-800-FOR-MERCedes (1-800-367-6372).
In Canada, you can get in touch with the Cus-tomer Relations Center on 1-800-387-0100.
Searching for and authorizing (connect-
ing) a mobile phone
Before using your mobile phone with the multi-media system for the first time, you will need tosearch for the phone and then authorize (con-nect) it. Depending on the mobile phone, author-ization either takes place by means of SecureSimple Pairing or by entering a passkey. Themultimedia system automatically makes theprocedure that is relevant for your mobile phoneavailable. The mobile phone is always connec-ted automatically after authorization. Furtherinformation on using a mobile phone with themultimedia system (see the Digital Operator'sManual).
If the multimedia system does not detect yourmobile phone, this may be due to particularsecurity settings on your mobile phone (see themanufacturer's operating instructions).
Searching for a mobile phone
Multimedia system:
XSelectTel/Tel/

XAuthorization using Secure Simple Pair-ing:
A code is displayed in the multimedia systemand on the mobile phone.
XConfirm code on the mobile phone. Depend-ing on the mobile phone used, confirm theconnection to the multimedia system and for
the PBAP and MAP Bluetooth®profiles. Theprompt to confirm may take up to twominutes to be displayed (see the manufactur-er's operating instructions).
XIf the codes are different: selectNoNoon themultimedia system.The process is canceled.
Repeat authorization.
or
XAuthorization by entering a passkey(passcode):enter any one- to sixteen-digitnumber sequence which you have chosenyourself into the passkey input menu.
XPressTto confirm.
XEnter and confirm the passkey on the mobilephone. 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 upto two minutes to be displayed (see the man-ufacturer's operating instructions).
Symbols in the device manager
The symbols are shown in color depending ontheir use.
SymbolExplanation
Mobile phone connected to themultimedia system
Main telephone with full range offunctions
Additional telephone for incomingcalls in two telephone mode
Media mode
General notes
If you wish to play external media sources, theappropriate media mode must already be turnedon. Further information on media mode (see theDigital Operator's Manual).
The following external media sources can beused:
RApple®devices (e.g. iPhone®)
RUSB devices (e.g. USB stick, MP3 player)(Ypage 238)
RCD
RDVD (COMAND)
RSD cards
RVia devices connected by Bluetooth®
iInformation on single CD/DVD drive or DVDchanger (see the Digital Operator's Manual).
Selecting using the device list
Multimedia system:
XSelectMediaMedia{DevicesDevices.The available media sources will be shown.The;dot indicates the current setting.
XSelect the media source.Playable files are played.
Inserting/removing an SD card
Important safety notes
GWARNING
SD cards are small parts. They can be swal-
lowed and cause choking. This poses an
increased risk of injury or even fatal injury.
Keep the SD card out of the reach of children.
If a SD card is swallowed, seek medical atten-
tion immediately.
!If the SD card is no longer in use, you shouldtake it out and remove it from the vehicle.High temperatures can damage the card.
Inserting an SD card
The SD card slot is located on the control panel.
XInsert the SD card into the SD card slot untilthe SD card engages. The side with the con-tacts must face down.
Removing an SD card
XPress the SD card.The SD card is ejected.
XRemove the SD card.
Operating system237
Multimedia system
Z

Loading guidelines
GWARNING
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.
GWARNING
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.
GWARNING
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 vehicleare dependent on the distribution of the loadwithin the vehicle.
Observe the following notes when loading andtransporting a load:
RNever exceed the maximum permissiblegross vehicle mass or the gross axle weightrating for the vehicle (including occupants).The values are specified on the vehicle iden-
tification plate on the B-pillar of the driver'sdoor.
RThe trunk is the preferred place to carryobjects.
RPosition heavy loads as far forwards as pos-sible and as low down in the trunk as possible.
RThe load must not protrude above the upperedge of the seat backrests.
RAlways place the load against the rear or frontseat backrests. Make sure that the seatbackrests are securely locked into place.
RAlways place the load behind unoccupiedseats if possible.
RUse the cargo tie-down rings and the parcelnets to transport loads and luggage.
RUse cargo tie-down rings and fastening mate-rials appropriate for the weight and size of theload.
RSecure the load with sufficiently strong andwear-resistant tie-downs. Pad sharp edges forprotection.
Stowage areas
Stowage spaces
Important safety notes
GWARNING
If objects in the passenger compartment are
stowed incorrectly, they can slide or be
thrown around and hit vehicle occupants. In
addition, cup holders, open stowage spaces
and mobile phone brackets cannot always
retain all objects they contain. There is a risk
of injury, particularly in the event of sudden
braking or a sudden change in direction.
RAlways stow objects so that they cannot be
thrown around in such situations.
RAlways make sure that objects do not pro-
trude from stowage spaces, parcel nets or
stowage nets.
RClose the lockable stowage spaces before
starting a journey.
RAlways stow and secure heavy, hard, poin-
ted, sharp-edged, fragile or bulky objects in
the trunk.
Observe the loading guidelines (Ypage 239).
Stowage areas239
Stowage and features
Z