
Locking/unlocking from inside ........71
SmartKey  ......................................... 66
Central locking/unlocking switch  ..... 71
Certification label  .............................. 328
Children in the vehicle  
Air bags  ........................................... 37
BabySmart™ air bag deactivation
system  ............................................. 45
Child safety locks (rear doors)  .........58
Child seat anchors – LATCH-type
(ISOFIX)  ........................................... 57
Indicator lamp, front passenger
front air bag off (Canada only)  .........45
Indicator lamp, front passenger
front air bag off (USA only)  ..............42
Infant and child restraint systems .... 54
ISOFIX (Child seat anchors –
LATCH-type) ..................................... 57
OCS (Occupant Classification
System)  ........................................... 42
Override switch  ................................ 58
Safety notes ..................................... 53
Tether anchorage points  ..................56
Top tether  ........................................ 56
Child safety
see Children in the vehicle                        
Child seat anchors – LATCH-type
(ISOFIX) see Children in the vehicle                        
Chrome-plated exhaust tip,
cleaning  .............................................. 257
Cigarette lighter  ................................ 197
Clear button  ....................................... 130
Climate control system  .................... 177
Air conditioning  ............................. 179
Air conditioning refrigerant  ............336
Air distribution  ............................... 181
Air recirculation mode  ...................183
Air volume  ..................................... 182
Automatic mode  ............................ 179
Deactivating system  ......................179
Front defroster  .............................. 182
Maximum cooling MAX COOL  ........182
Temperature  .................................. 180
Clock  ............................................ 29, 121
Coat hooks  ......................................... 189
Cockpit  ................................................. 27
Cold tire inflation pressure  .............. 239Collapsible tire (spare wheel)  .......... 333
Collapsible wheel chock  ................... 261
COMAND system see separate COMAND system
operating instructions                               
Combination gauge  ............................. 28
Combination switch  ............................ 90
Compass  ............................................ 199
Control system  .................................. 110
Multifunction display  .....................112
Multifunction steering wheel  .........110
Resetting to factory settings  ..........119
Control system menus  ...................... 113
Audio  ............................................. 115
Navi  ............................................... 115
Service ........................................... 118
Settings  ......................................... 119
Telephone  ...................................... 117
Trip  ................................................ 113
Control system submenus  
Convenience  .................................. 124
Instrument cluster  .........................120
Lighting  .......................................... 122
Time/Date  ..................................... 121
Vehicle  ........................................... 123
Convenience submenu  
Easy-entry/exit feature .................. 124
Fold-in function for exterior rear
view mirrors  ................................... 124
Coolant  
Anticorrosion/antifreeze  ...............338
Capacities  ...................................... 334
Checking level  ............................... 216
Messages in the multifunction
display  ........................................... 279
Temperature gauge ........................ 109
Warning lamp ................................. 295
Coolant temperature gauge  ............... 28
Corner-illuminating lamps  .................. 91
Replacing bulbs  ............................. 304
Cruise control  .................................... 168
Activating ....................................... 169
Canceling  ....................................... 169
Changing the set speed  .................170
Last stored speed  ..........................170
Lever .............................................. 169
Messages in the multifunction
display  ........................................... 2676IndexX204_AKB; 3; 23, en-USd2ureepe,Version: 2.11.8.12009-07-16T19:16:58+02:00 - Seite 6 

Electronic Traction Systemsee ETS/4-ETS                                          
Emergency, in case of  
First aid kit ..................................... 260
Flat tire  .......................................... 312
Hazard warning flasher  ....................90
Roadside Assistance ................ 20, 203
Towing the vehicle  .........................321
Emergency calls  
Tele Aid  .......................................... 201
Telephone  ...................................... 161
Emergency operations  
Remote door lock (Tele Aid) ........... 205
Remote door unlock (Tele Aid)  .......204
Emergency Tensioning Device
see ETD                                                     
Emission control  ............................... 249
Information label ............................ 329
System warranties  ...........................19
Engine  
Break-in recommendations  ............212
Cleaning ......................................... 253
Compartment  ................................ 214
Malfunction indicator lamp  ............295
Messages in the multifunction
display  ........................................... 279
Number .......................................... 329
Starting  ............................................ 98
Turning off  ..................................... 102
Engine (Technical data)
see Vehicle specification                          
Engine coolant
see Coolant                                               
Engine oil  
Adding  ........................................... 216
Additives  ........................................ 336
Checking level  ............................... 215
Consumption  ................................. 215
Messages in the multifunction
display  ........................................... 282
Oil dipstick ..................................... 215
Recommended engine oils and oil
filter  ............................................... 335
ESP ®
 (Electronic Stability
Program)  .............................................. 61
ETS/4-ETS  ....................................... 62Messages in the multifunction
display  ........................... 271, 272, 274
Trailer stabilization ........................... 63
Warning lamp ................................. 293
ETD (Emergency Tensioning
Device)  ................................................. 51
Safety guidelines  ............................. 39
ETS/4-ETS (Electronic Traction
System)  ................................................ 62
Express operation  
Panorama roof  ............................... 185
Power windows  ................................ 95
Exterior lamp switch  ........................... 87
Exterior rear view mirrors  .................. 84
Fold-in function  ................................ 86
Parking position  ............................... 85
Power-folding  ................................... 85
Switching fold-in function on or
off  .................................................. 124
Exterior view of vehicle  ...................... 26
F
Fastening the seat belts  ..................... 49
First aid kit  ......................................... 260
Flat tire  ............................................... 312
Lowering the vehicle  ......................317
Mounting the spare wheel  .............312
Preparing the vehicle  .....................312
Spare wheel ........................... 312, 333
Floormats  ........................................... 209
Fluids  
Automatic transmission fluid  .........334
Brake fluid  ..................................... 334
Capacities  ...................................... 334
Engine coolant  ............................... 334
Engine oil  ....................................... 334
Power steering fluid  .......................334
Washer and headlamp cleaning
system  ........................................... 335
Fog lamps  ............................................. 89
Messages in the multifunction
display  ................................... 283, 285
Fold-in function for exterior rear
view mirrors  ........................................ 86
Four-wheel drive see All-wheel drive (4MATIC)                    
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Self-test 
BabySmart™  .................................... 46
OCS (Occupant Classification
System)  ........................................... 45
Tele Aid  .......................................... 201
Service
see Maintenance                                       
Service, parts  .................................... 328
Service and warranty information  ..... 19
Service intervals see Maintenance System, Service
indicator message                                     
Service life (tires)  .............................. 232
Service menu  ..................................... 118
Settings  
Factory setting (KEYLESS-GO)  .........69
Factory setting (SmartKey)  ..............67
Memory function .............................. 86
Menu  ............................................. 119
Selective setting (KEYLESS-GO)  .......69
Selective setting (SmartKey)  ............67
Side impact air bags  ........................... 40
Side marker lamps  
Cleaning lenses  ............................. 254
Messages in the multifunction
display  ........................................... 284
Replacing bulbs  ............................. 304
Sidewall (tires)  .................................. 241
SmartKey see Key, SmartKey                                    
SmartKey with KEYLESS-GO
see Key, SmartKey                                    
Snow chains  ...................................... 242
Snow tires see Winter tires                                         
Spare wheel  ....................................... 331
Mounting  ....................................... 312
Storage location  ............................ 262
Speedometer  ....................................... 28
Speed settings  
Cruise control  ................................ 169
Resume function  ............................ 170
Sport Utility Vehicle
see SUV                                                    SRS (Supplemental Restraint System)  
Indicator lamp  ......................... 36, 293
Messages in the multifunction
display  ........................................... 275
Standing water, driving through  ...... 246
Starter switch positions  
KEYLESS-GO  .................................... 76
SmartKey  ......................................... 76
Starting difficulties (engine)  .............. 99
Starting the engine  ............................. 98
Steering column see Multifunction steering wheel,
Adjustment                                               
Steering wheel
see Multifunction steering wheel              
Stolen Vehicle Recovery Services  ... 205
Storage compartments  ..................... 192
Storing tires  ....................................... 233
Stranded vehicle  ............................... 324
Sun visors  .................................. 195, 196
SUV (Sport Utility Vehicle)  ................. 21
T
Tachometer  .................................. 28, 109
Overspeed range  ........................... 109
Tailgate  
Closing  ............................................. 71
Messages in the multifunction
display  ........................................... 277
Opening  ........................................... 71
Power tailgate  .................................. 72
Unlocking manually  .......................300
Tail lamps  ........................................... 305
Cleaning lenses  ............................. 254
Messages in the multifunction
display  ........................................... 286
Replacing bulbs  ............................. 305
Tar stains  ........................................... 252
Technical data  
Air conditioning refrigerant  ....335, 336
Brake fluid  ............................. 334, 336
Capacities fuels, coolants,
lubricants etc.  ................................ 334
Coolant  .................................. 334, 337
Engine oil additives  ........................336
Engine oils  ............................. 334, 335
Fuel requirements .......................... 337
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Gasoline additives .......................... 337
Identification labels  .......................328
Premium unleaded gasoline  ...........336
Rims and tires  ................................ 331
Spare wheel  ................................... 333
Vehicle specification GLK 350  .......330
Vehicle specification
GLK 350 4MATIC  ........................... 330
Washer and headlamp cleaning
system  ................................... 335, 339
Technical data (dimensions)
see Vehicle specification                          
Technical data (electrical system)
see Vehicle specification                          
Technical data (engine)
see Vehicle specification                          
Technical data (weights)
see Vehicle specification                          
Tele Aid  ............................................... 200
Emergency calls  ............................. 201
Information button  .........................203
Initiating an emergency call
manually  ........................................ 202
Messages in the multifunction
display  ........................................... 275
Remote door lock  .......................... 205
Remote door unlock  ......................204
Roadside Assistance button  ..........203
Search & Send  ............................... 204
SOS button  .................................... 202
Stolen Vehicle Recovery Services  ..205
System self-test  ............................. 201
Telephone  .................................... 29, 155
Answering/ending a call  ................117
Call lists  ......................................... 164
Emergency calls “911”  ..................161
Hands-free microphone  ...................32
Making calls ................................... 165
Menu  ............................................. 117
Operation ....................................... 117
Phone book  ........................... 117, 162
Redialing  ........................................ 118
Temperature  
Coolant  .......................................... 109
Interior temperature  ......................180
Outside  .......................................... 110
Tether anchorage points
see Children in the vehicle                        Tie-down rings ................................... 188
Tightening torque  
Wheels  ........................................... 317
Time setting  ....................................... 121
TIN (Tire Identification Number)  ...... 241
Tire and Loading Information
placard  ............................................... 227
Tire and loading terminology  ........... 239
Tire Identification Number see TIN                                                      
Tire inflation pressure  
Checking ........................................ 221
Important notes on  ........................220
Label on the inside of fuel filler
flap  ................................................ 220
Placard on driver’s door B-pillar  .....227
Tire labeling  ....................................... 235
Tire load rating  .................................. 240
Tire ply composition and material
used  .................................................... 241
Tire pressure loss warning system  . 222
Tires  ........................................... 218, 331
Advanced Tire Pressure
Monitoring System (Advanced
TPMS)  ............................................ 224
Air pressure  ................................... 219
Care and maintenance  ...................232
Cleaning ......................................... 233
Direction of rotation, spinning  .......231
Important notes on tire inflation
pressure  ........................................ 220
Inflation pressure  ........................... 221
Information placard  .......................227
Inspection  ...................................... 232
Labeling  ......................................... 235
Load index  ............................. 235, 240
Load rating  .................................... 240
Messages in the multifunction
display  ................................... 268, 288
Ply composition and material
used ............................................... 241
Problems under-/overinflation  ......221
Retreads  ........................................ 218
Rims and tires (technical data)  ......331
Rotation  ......................................... 234
Service life  ..................................... 232
Sizes  .............................................. 331
Snow chains  .................................. 24216IndexX204_AKB; 3; 23, en-USd2ureepe,Version: 2.11.8.12009-07-16T19:16:58+02:00 - Seite 16 

Load limit ....................................... 228
Roof rack  ....................................... 188
Split rear seat bench  .....................189
Terminology  ................................... 239
Vehicle maximum load on the tire  ... 241
Vehicle specification   
GLK 350  ........................................ 330
GLK 350 4MATIC  ........................... 330
Vehicle status message memory  .... 118
Vehicle tool kit  .................................. 260
Vehicle washing see Vehicle care                                        
Vehicle weights
see Vehicle specification                          
W
Warning sounds  
Driver’s or passenger’s seat belt  .....50
Parking brake  ................................ 272
Parktronic system  ..........................174
Seat belt telltale  ............................ 292
Warranty coverage  ............................ 328
Washer and headlamp cleaning
system  ................................................ 339
Washer fluid  
Mixing ratio  .................................... 339
Refilling  .......................................... 217
Washing the vehicle  .......................... 251
Wear pattern (tires)  .......................... 234
Weights (vehicle) see Vehicle specification                          
Wheel  
Changing  ....................................... 312
Removing  ....................................... 314
Spare  ............................................. 312
Tightening torque ........................... 317
Wheels, sizes  ..................................... 331
Wheels, Tires and  .............................. 218
Window curtain air bags  ..................... 41
Windows see Power windows                                  
Windows, cleaning  ............................ 255
Windshield  
Cleaning wiper blades .................... 255
Defogging  ...................................... 182
Washer fluid  ................................... 339
Wipers  ............................................. 93
Windshield wipers 
Replacing wiper blades  ..................310
Winter driving  
Instructions .................................... 243
Snow chains  .................................. 242
Tires ............................................... 241
Winter tires  ................................ 241, 331
Wood trims, cleaning  ........................ 25718IndexX204_AKB; 3; 23, en-USd2ureepe,Version: 2.11.8.12009-07-16T19:16:58+02:00 - Seite 18 

as specified in the “Technical data” section
of this Operator’s Manual.
iThe cruise control switches off
automatically when the ESP® engages.
Electronic Traction System 
(ETS/4-ETS) 
GObserve Safety notes, see page 60.
The ETS (Electronic Traction System) and
4-ETS (four-wheel Electronic Traction
System, vehicles with 4MATIC only) are
components of the ESP®. The ETS/4-ETS
improves the vehicle’s ability to utilize
available traction, especially under slippery
road conditions by applying the brakes to a
spinning wheel. Vehicles with 4MATIC also
transfer more power to the wheel(s) with
traction.
When you switch off the ESP®, the
ETS/4-ETS is still enabled.
Switching off the ESP®
GWarning!
The ESP® should not be switched off during
normal driving other than in the
circumstances described below. Disabling
the system will reduce vehicle stability in
driving maneuvers.
Do not switch off the ESP® when a spare
wheel is mounted.
To improve the vehicle’s traction, switch off
the ESP®. This allows the drive wheels to spin
and thus cut into surfaces for better grip, for
example
Rwhen driving with snow chains
Rin deep snow
Rin sand or gravel
GWarning!
Switch on the ESP® immediately if the
aforementioned circumstances do not apply
anymore. Otherwise the ESP® will not
stabilize the vehicle when it is starting to skid
or a wheel is spinning.
When you switch off the ESP®,
Rthe ESP® does not stabilize the vehicle
Rthe engine output is not limited, which
allows the drive wheels to spin and thus cut
into surfaces for better grip
Rthe ETS/4-ETS will still apply the brakes to
a spinning wheel
Rthe ESP® continues to operate when you
are braking
Rthe cruise control cannot be activated
Rthe cruise control switches off if activated
iWhen the ESP® is switched off and one or
more drive wheels are spinning, the ESP®
warning lamp d in the instrument
cluster flashes. However, the ESP® will
then not stabilize the vehicle.
XWith the engine running, press ESP®
switch : until the ESP® warning lamp
d in the instrument cluster comes on.
The ESP® is switched off.
GWarning!
When the ESP® warning lamp d is
illuminated continuously, the ESP® is
switched off or is not operational due to a
malfunction. Vehicle stability in standard
driving maneuvers is reduced.
62Driving safety systemsSafety and security
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XSwitch on the ignition.XPush and hold the roof panel switch in
direction of arrow ; (Y page 184) until the
roller sunblinds are fully retracted.
XPush and hold the roof panel switch in
direction of arrow ; until the tilt/sliding
panel is opened approximately 4 inch
(10 cm).
XPull and hold the roof panel switch in
direction of arrow = until the tilt/sliding
panel is fully closed.
XKeep holding the roof panel switch in
direction of arrow = for approximately
1 second.
XPull and hold the roof panel switch in
direction of arrow = (Y page 184) until the
roller sunblinds are fully extended.
XKeep holding the roof panel switch in
direction of arrow = for approximately
1 second.
XCheck the express operation feature of the
tilt/sliding panel (Y page 185).
If the tilt/sliding panel opens completely,
the roof is synchronized. Otherwise repeat
the above steps.
Loading and storing
Loading instructions
GWarning!
Always fasten items being carried as securely
as possible using cargo tie-down rings and
fastening materials appropriate for the weight
and size of the load.
In an accident, during hard braking or sudden
maneuvers, loose items will be thrown around
inside the vehicle. This can cause injury to
vehicle occupants unless the items are
securely fastened in the vehicle.
To help avoid personal injury during a collision
or sudden maneuver, exercise care when
transporting cargo. Do not pile luggage or
cargo higher than the seat backrests.
Never drive a vehicle with the tailgate open.
Deadly carbon monoxide (CO) gases may
enter vehicle interior resulting in
unconsciousness and death.
Load distribution
The Gross Vehicle Weight (GVW) is the weight
of the vehicle including:Rfuel
Rtools
Rspare wheel
Rinstalled accessories
Rpassengers
Rluggage/cargo
It must never exceed the load limit and the
Gross Vehicle Weight Rating (GVWR) for your
vehicle. The load limit and the GVWR are
specified on the placard located on the
driver’s door B-pillar (Y page 227).
In addition, the load must be distributed so
that the weight on each axle never exceeds
the Gross Axle Weight Rating (GAWR) for the
front and rear axle. The GVWR and GAWR for
your vehicle are indicated on the certification
label located on the driver’s door B-pillar
(Y page 227).
For more information, see “Tire and Loading
Information” (Y page 228).
The handling characteristics of a fully loaded
vehicle depend greatly on the load
distribution. It is therefore recommended to
load the vehicle according to the illustration
Loading and storing187Controls in detailX204_AKB; 3; 23, en-USd2ureepe,Version: 2.11.8.12009-07-16T19:16:58+02:00 - Seite 187Z   

Roadside Assistance button XPress and hold Roadside Assistance
button : for longer than 2 seconds.
A call to a Mercedes-Benz Roadside
Assistance dispatcher will be initiated. The
indicator lamp in Roadside Assistance
button : will flash while the call is in
progress. The message Connecting 
Call will appear in the multifunction
display and the audio system or the
COMAND system is muted.
When the connection is established, the
message Call Connected appears in the
multifunction display. The Tele Aid system will
transmit data generating the vehicle
identification number, model, color and
location (subject to availability of cellular and
GPS signals).
i The audio system or COMAND system
display indicates that a Tele Aid call is in
progress. While the call is connected you
can change to the navigation menu by
pressing the NAVI button on the COMAND
system. Spoken commands are not
available.
A voice connection between the Roadside
Assistance dispatcher and the occupants of
the vehicle will be established.
XDescribe the nature of the need for
assistance.
The Mercedes-Benz Roadside Assistance
dispatcher will either dispatch a qualified
Mercedes-Benz technician or arrange to tow
your vehicle to the nearest authorized
Mercedes-Benz Center. For services such as
labor and/or towing, charges may apply.
Refer to the Roadside Assistance manual for
more information.
Sign and Drive services (USA only):
Services such as a jump start, a few gallons
of fuel or the replacement of a flat tire with
the vehicle spare wheel are obtainable at no
charge.
iIf the indicator lamp in Roadside
Assistance button : is flashing
continuously and there was no voice
connection to the Customer Assistance
Center established, then the Tele Aid
system could not initiate a Roadside
Assistance call (e.g. the relevant cellular
phone network is not available). The
message Call Failed appears in the
multifunction display.
XTerminating calls: Press button ~ on
the multifunction steering wheel.
or
XPress the respective button for ending a
telephone call on the audio system or the
COMAND system.
Information button 
XPress and hold Information button : for
longer than 2 seconds.
A call to the Customer Assistance Center
will be initiated. The indicator lamp in
Information button : will flash while the
call is in progress. The message
Connecting Call will appear in the
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