2005 MERCEDES-BENZ S CLASS key battery

388 Practical hintsReplacing SmartKey batteries3Battery
4Contact spring
Using a lint-free cloth, insert new
batteries3 under the contact
spring4 with the plus (+) side facing
up.

Return battery compartment2 into
housing until it locks into place.

Slide mechanical key1 back into the
SmartKey.

Check the operation of the SmartKey.
SmartKey with KEYLESS-GO*
1Battery
2Tilt battery up
3Mechanical key

Remove mechanical key out of the
SmartKey (
page 383).
Replacement battery: Lithium, type
CR 2025 or equivalent.

Insert the mechanical key3 in side
opening and push gray slide.
The battery compartment is unlatched.

Pull the battery compartment out of the
SmartKey housing.

Using mechanical key3, apply pres-
sure to position2.
Battery1 tilts up slightly.

Pull out battery1 in direction of ar-
row.

Using a lint-free cloth, insert the new
battery with the plus (+) side facing up.

Return battery compartment into hous-
ing until it locks into place.

Slide mechanical key1 back into the
SmartKey.

Check the operation of KEYLESS-GO*.
iWhen inserting the battery, make sure
they are clean and free of lint.iThe required replacement battery is
available at any authorized
Mercedes-Benz Center.

403 Practical hints
Battery
Battery
The battery is located on the right side of
the trunk under the battery cover.
1Battery cover
Warning!
G
Failure to follow these instructions can re-
sult in severe injury or death.
Never lean over batteries while connecting,
you might get injured.
Battery fluid contains sulfuric acid. Do not
allow this fluid to come in contact with eyes,
skin or clothing. In case it does, immediately
flush affected area with water and seek
medical help if necessary.
A battery will also produce hydrogen gas,
which is flammable and explosive. Keep
flames or sparks away from battery, avoid
improper connection of jumper cables,
smoking, etc.
Warning!
G
Do not place metal objects on the battery as
this could result in a short circuit.
Use leak-proof battery only to avoid the risk
of acid burns in the event of an accident.!Never loosen or detach battery termi-
nal clamps while the engine is running
or the SmartKey is in the starter switch.
Otherwise the alternator and other
electronic components could be se-
verely damaged.
Have the battery checked regularly by
an authorized Mercedes-Benz Center.
Refer to Maintenance Booklet for main-
tenance intervals or contact an autho-
rized Mercedes-Benz Center for further
information.
Warning!
G
With a disconnected battery

you will no longer be able to turn the
SmartKey in the starter switch and
pressing the KEYLESS-GO* start/stop
button (
page 35) on the gear selector
lever will have no effect


the gear selector lever will remain
locked in positionP

409 Practical hints
Towing the vehicle
!
To be certain to avoid a possibility of
damage to the drive train, however, we
recommend the drive shaft be discon-
nected at the rear axle drive flange (ve-
hicles with 4MATIC: disconnected at
the front and rear axle drive flanges) for
any towing beyond a short tow to a
nearby garage.Warning!
G
If circumstances require towing the vehicle
with all wheels on the ground, always tow
with a tow bar if:

the engine will not run


there is a malfunction in the power sup-
ply or in the vehicle’s electrical system
as that will be necessary to adequately con-
trol the towed vehicle.
Prior to towing the vehicle with all wheels on
the ground, make sure the SmartKey is in
starter switch position2.
If the SmartKey is left in starter switch
position0 for an extended period of time, it
can no longer be turned in the switch. In this
case, the steering is locked. To unlock, re-
move SmartKey from starter switch and re-
insert.Warning!
G
With the engine not running, there is no
power assistance for the brake and steering
systems. In this case, it is important to keep
in mind that a considerably higher degree of
effort is necessary to brake and steer the ve-
hicle. Adapt your driving accordingly.iThe gear selector lever will remain
locked in positionP and the SmartKey
will not turn in the starter switch if the
battery is disconnected or discharged.
See information on the battery
(page 403) or on jump starting
(page 406).
iTo signal turns while being towed with
the hazard warning flasher in use, turn
SmartKey in starter switch to
position2 and activate the combina-
tion switch for the left or right turn sig-
nal in the usual manner – only the
selected turn signal will operate.
Upon canceling the turn signal, the haz-
ard warning flasher will operate again.

445 Index
Armrest
Storage compartment in front of 245,
246, 247
Ashtray 251
Aspect ratio 322
At the gas station 283
ATF (Automatic Transmission Fluid) 292
AUDIO menu 148
Selecting CD track 150
Selecting MP3-CD track 150
Selecting radio station 149
Selecting satellite radio* station (USA
only) 149
Audio system
CD mode 151
Auto-dimming for rear view mirror 186
Automatic central locking
Activating/deactivating (control
system) 168
Automatic climate control 192
Air recirculation mode 199
Defrosting 199
Rear window defroster 201
Setting the temperature 195
Automatic headlamp mode 132Automatic lighting control
Activating 137
Deactivating 137
Automatic locking when driving 112
Automatic shift program
Automatic transmission 179
Automatic transmission 173
Accelerator position 180
Automatic shift program 179
Emergency operation (Limp Home
Mode) 185
Fluid level 292
Gear ranges 176
Gear selector lever position 173, 177
Gear shifting malfunctions 185
Kickdown 180
Kickdown, manual shift program S 55
AMG 184
Manual shift program S 55 AMG 183
Manual shifting 175
One-touch gearshifting 175
Starting the engine 46
Steering wheel gearshift control S 55
AMG 181
Transmission fluid 292
Auxiliary fuse box 412B
BabySmart
TM
Air bag deactivation system 73
Compatible child seats 73, 437
Self-test 74
BabySmart
TM airbag deactivation
system 437
Backrest supports
Lumbar region 123
Shoulder region 123
Backup lamps 390, 395
Bulbs 390
Bar 322
BAS 81, 437
Messages in display 351
Batteries, SmartKey
Check lamp 95
Checking 95
Replacing 387
Batteries, SmartKey with KEYLESS-GO*
Checking 101
Battery discharged
Jump starting 406

446 IndexBattery, SmartKey with KEYLESS-GO*
Check lamp 101
Replacing 388
Battery, vehicle 294, 403
Charging 404
Disconnecting 404
Reconnecting 405
Reinstalling 404
Removing 404
Bead 322
Bi-Xenon headlamps 437
Block heater (Canada only) 327
Blocking
Rear window operation 78
Brake assist system (BAS) 437
Brake fluid 284, 431
Brake lamp bulbs 390
Brake lamp, high mounted 390
Brake pads
Message in display 357
Brakes 274
Warning lamp 339
Break-in period 272Bulbs, replacing 389
Additional turn signals 390
Backup lamps 390
Brake lamps 390
Fog lamps 390
Front lamps 390
High beam 390
High mounted brake lamp 390
License plate lamps 390, 395
Low beam 390
Parking and standing lamps 390
Parking lamps 390, 394
Rear fog lamp 390, 395
Rear fog lamps 394
Side marker lamps 390, 394
Standing lamps 390, 394
Tail lamp assemblies 390
Tail lamp unit 395
Turn signal lamps 390C
CAC (Customer Assistance Center) 437
Calling up
Distronic* settings 156
Maintenance service indicator 329
Range (distance to empty) 158
CAN system 438
Canceling
Cruise control 215
Cargo tie-down hooks 241
Catalytic converter 281
CD changer* 151
CD mode 151
CD operation
Selecting tracks 150
Center console 27
Air bag off indicator lamp 346
Front passenger front air bag off indica-
tor lamp 346

447 Index
Centigrade (°C)
Setting temperature units 163
Central locking
Automatic 112
From inside 113
Switch 113
Switching on/off (control
system) 168
Unlocking from inside 113
Change of address or ownership 12
Changing
CDs 151
SmartKey setting 169
Vehicle level 230, 233
Charcoal filter 200
Activating 200
Deactivating 201
Charging
Vehicle battery 404Checking
Brake fluid 284
Coolant level 292
Oil level 285, 287
Oil level via control system 288
Tire inflate pressure 285
Vehicle lighting 285
Child safety 71
Air bags 62
Infant and child restraint systems 66,
71
LATCH child seat anchors 76
Cigarette lighter 252
Cleaning
Cup holder 335
Distronic* system sensor cover 333
Gear selector lever 335Hard plastic trim items 335
Headlamps 186
Headliner and shelf below rear
window 335
Instrument cluster 335
Leather upholstery 336
Light alloy wheels 335
Nubuck leather upholstery 336
Parktronic* system sensor 333
Plastic and rubber parts 336
Seat belts 335
Steering wheel 335
Upholstery 336
Windows 334
Windshield 53
Wiper blades 333
Wood trims 336
Cleaning tires 298

449 Index
Cruise control 214, 438
Canceling 215
Driving downhill 215
Driving uphill 215
Fine adjustment 216
Lever 221
Setting current speed 215
Setting to last stored speed (“Resume”
function) 216
Cruise control lever 214
Cup holder
Cleaning 335
Closing 250
In front seat armrest 248
In rear seat armrest 249
Opening 250
Curb weight 322
Customer Assistance Center (CAC) 437
D
Daytime running lamp mode 133
Setting 165
Deactivating
Air conditioner (cooling) 202
Air recirculation mode 200
Alarm 88
Anti-theft alarm system 88Automatic climate control 202
Central locking (control system) 168
Charcoal filter 201
Defrost 199
Distance warning function* 226
Distronic* 224
Engine with the SmartKey 57
ESP 83
Exterior lamps 132
Hazard warning flasher 136
Headlamps 57
Immobilizer 86
Interior illumination delayed
switch-off 167
Limiting opening height of trunk
lid* 169
Manual shift program S 55 AMG 185
Rear window defroster 201
Residual heat 203
Seat heater 125, 126
Seat ventilation* 127
Tow-away alarm 89
Deceleration
With Distronic* 220
Deep water see Standing water 280
Defrosting 199Delayed switch-off
Interior illumination 167
Department of Transportation see DOT
Dialing
A number (telephone) 154
Difficulties
While driving see Problems while
driving 54
Digital clock 25
Digital speedometer 148
Direction of rotation (tires) 299
Discharged battery
Jump starting 406
Disconnecting
Vehicle battery 404
Displays
Digital speedometer 148
Distronic* 219
Messages 289
Service indicator 328
Showing malfunctions 159
Vehicle status messages 347

455 Index
J
Jump starting 406
K
Key see SmartKey 57, 58
Key, mechanical 383
Key, SmartKey
Checking the batteries 95
Locking 58
Key-dependency memory
Settings 169
KEYLESS-GO* 439
Activating ignition with 36
Locking 58
Locking the vehicle 101
Loss of SmartKey with
KEYLESS-GO 102
Messages in display 364
Starting the engine 47
Turning off engine 57Kickdown 180, 439
Kilometers/miles in speedometer 163
Kilopascal 323
Km/h or mph in speedometer 163
L
Lamp bulbs, exterior 389
Lamps, exterior
Front 390
Light sensor 366
Messages in display 367
Rear 390
Lamps, indicator and warning
ABS 338
Air bag Off 65
Battery (SmartKey with
KEYLESS-GO*) 100
Battery (SmartKey) 94
Brakes 339
Coolant 358
Distronic* 219Engine diagnostics 340, 341
Engine malfunction indicator
lamp 340, 341
ESP 342, 343
Front passenger front air bag off 346
Fuel reserve 341
Instrument cluster 338–345
Seat belts telltale 343
Service indicator 328
SRS 61
Language
Multifunction display 164
Setting 164
LATCH child seat anchors 76
Layout of poly-V-belt drive 419
Leather upholstery
Cleaning 336
Lever
For cruise control 221
License plate lamps
Replacing bulbs 390, 395