2005 MERCEDES-BENZ SL55AMG brake sensor

218 Controls in detailDriving systems
The most likely cause for a malfunctioning
system is a dirty sensor (located behind
the hood grille), especially at times of snow
and ice or heavy rain. In such a case, Dis-
tronic will switch off, and the message Distronic Currently unavailable. See
Oper. Manual
appears in the multifunction
display.
For cleaning and care of the Distronic sen-
sor, see “Cleaning the Distronic* system
sensor cover” (page 318).Turns and bends
In turns or bends, Distronic may not detect
a moving vehicle in front, or it may detect
one too soon. This may cause your vehicle
to brake late or unexpectedly.
Distronic regulates only the distance be-
tween your vehicle and those directly ahead
of it, but does not register stationary objects
in the road, e.g.:

a stopped vehicle in a traffic jam


a disabled vehicle


an oncoming vehicle
The driver must always be on the alert, ob-
serve all traffic and intercede as required by
steering or braking the vehicle.
Warning!
G
Distronic should not be used in snowy or icy
road conditions.


223 Controls in detail
Driving systems
Parktronic* (Parking assist)
The Parktronic system is an electronic aid
designed to assist the driver during park-
ing maneuvers. It visually and audibly indi-
cates the relative distance between the
vehicle and an obstacle.
The Parktronic system is automatically ac-
tivated when you switch on the ignition, re-
lease the parking brake, or place the gear
selector lever in Position D, R, or N. The
Parktronic system deactivates at speeds
above 11 mph (18 km/h). At lower speeds
the Parktronic system turns on again.
The Parktronic system also deactivates
when you place the gear selector lever in
Position P or depress the brake pedal.The Parktronic system monitors the sur-
roundings of your vehicle with six sensors
in the front bumper and four sensors in the
rear bumper.
1Sensors in the front bumperWarning!
G
Parktronic is a supplemental system. It is
not intended to, nor does it replace, the
need for extreme care. The responsibility
during parking and other critical maneuvers
always rests with the driver.
Special attention must be paid to objects
with smooth surfaces or low silhouettes
(e.g. trailer couplings, painted posts, or road
curbs). Such objects may not be detected by
the system and can damage the vehicle.
The operational function of the Parktronic
system can be affected by dirty sensors, es-
pecially at times of snow and ice. See
“Cleaning the Parktronic* system sensors”
(page 318).
Interference caused by other ultrasonic sig-
nals (e.g. working jackhammers, car wash,
or the air brakes of trucks) can cause the
system to send erratic indications, and
should be taken into consideration.
Warning!
G
Make sure no persons or animals are in the
area in which you are maneuvering. Other-
wise you run the risk of causing injury.

224 Controls in detailDriving systemsRange of the sensors
To function properly, the sensors must be
free of dirt, ice snow and slush. Clean the
sensors regularly, being careful not to
scratch or damage the sensors, see
“Cleaning the Parktronic system* sensors”
(page 318).
Front sensors
Rear sensors
Center
approx. 40 in (100 cm)
Corners
approx. 24 in (60 cm)
Center
approx. 48 in (120 cm)
Corners
approx. 32 in (80 cm)
!During parking maneuvers, pay special
attention to objects located above or
below the height of the sensors (e.g.
planters or trailer hitches).
The Parktronic system will not detect
such objects at close range and dam-
age to your vehicle or the object may
result.
Ultrasonic signals from outside sourc-
es (e.g. truck air brakes, car wash, or
jackhammers) may impair the opera-
tion of the Parktronic system.

330 Practical hintsWhat to do if …Problem
Possible cause
Suggested solution
E
The red DTR indicator lamp
comes on while driving and you
hear a warning sound.


You are gaining too rapidly on the vehicle
ahead of you.


The distance warning system has recog-
nized a stationary obstacle on your prob-
able line of travel.

Apply the brakes immediately.

Carefully observe the traffic situation.
You may need to brake or maneuver
to avoid hitting an obstacle.
E
The white DTR indicator lamp
comes on while driving.
The Distronic* distance sensor has recog-
nized a vehicle in front of you.
A
The yellow fuel tank reserve
warning lamp lights while driv-
ing.
The fuel level has dropped below the reserve
mark.

Refuel at the next gas station
(page 267).
The fuel cap is not closed tightly.

Check the fuel cap (
page 267).

344 Practical hintsWhat to do if …Left display
Right display
Possible cause
Possible solution
Reactivate tire
pressure monitor
after rectifying
pressure
There was a tire inflation pressure
warning message.
The yellow warning lamp for the tire
pressure monitoring system comes on
and you have not reactivated the sys-
tem since the last tire inflation pres-
sure warning message.

Reactivate the tire pressure monitoring
system after correcting the tire inflation
pressure values (
page 293).
Tire pres.
monitor inoperative
Drive to workshop
The tire inflation pressure monitor is
malfunctioning.

Have the tire inflation pressure monitor
checked by an authorized Mercedes-Benz
Center.
A wheel without proper sensor was in-
stalled.

Have the wheel checked.
Warning!
G
Do not drive with a flat tire. A flat tire affects
the ability to steer or brake the vehicle.
You may lose control of the vehicle. Contin-
ued driving with a flat tire will cause exces-
sive heat build-up and possibly a fire.

439 Technical terms
ABS
(A
ntilock B
rake S
ystem)
Prevents the wheels from locking up
during braking so that the vehicle can
continue to be steered.
ABC
(A
ctive B
ody C
ontrol)
Active, computer-controlled system
that hydraulically adjusts the suspen-
sion at all four wheels in response to
various driving situations.
Alignment bolt
Metal pin with thread. The alignment
bolt, or centering bolt, is an aid used
when changing a tire to align the wheel
with the wheel hub.BabySmart
TM1
airbag deactivation
system
This system detects if a special system
compatible child restraint seat is in-
stalled on the front passenger seat. The
system will automatically deactivate
the passenger front airbag when such a
seat is properly installed (indicator
lamp 7 on the glove box comes on).
BabySmart
TM compatible child seats
Special restraint system for children.
The sensor system for the passenger
seat prevents deployment of the pas-
senger front airbag if a BabySmart
TM
compatible child seat is installed. See
your authorized Mercedes-Benz Center
for availability.BAS
(B
rake A
ssist S
ystem)
System for potentially reducing braking
distances in emergency braking situa-
tions. The system is activated when it
senses an emergency based on how
fast the brake is applied.
Bi-Xenon headlamps*
Headlamps which use an electric arc as
the light source and produce a more in-
tense light than filament headlamps.
Bi-Xenon headlamps produce low
beam and high beam.
CAC
(C
ustomer A
ssistance C
enter)
Mercedes-Benz customer service cen-
ter, which can help you with any ques-
tions about your vehicle and provide
assistance in the event of a break-
down.
1BabySmart
TM
is a trademark of Siemens
Automotive Corp.

451 Index
Intermittent signal tone 211
Setting a higher speed 214
Setting a slower speed 214
Setting distance 30
Setting last stored speed 215
Setting speed 214
System sensor cover 318
Warning and indicator lamps 210
Distronic* warning lamp 25
Door control panel 23, 32
Door handle 32
Doors
Message in display 354
Opening from inside vehicle 106
Storage compartments 229
DOT 305
Downhill driving
Cruise control 206
Downshifting 166
Drinking and driving 255Drive sensibly - save fuel 255
Driving 45, 50
Driving abroad 264
Driving hints
Distronic* 217
SBC brake system 87
Driving instructions 255
Driving off 258
Driving safety systems 79
ABS 79, 80
BAS 81
ESP 82
Driving systems 205
ABC 220
Cruise control 205
Distronic* 208
Parktronic* 223
Vehicle level control 221
DTR see DistronicE
Easy-entry/exit 157
Messages in display 354
Easy-entry/exit feature 113
Electric air pump 373, 397
Electrical consumer battery 277
Electrical outlet 236
Electronic Stability Program see ESP
Emergency call system*
Initiating emergency call 240
Requirements 237
Emergency engine shut-down 60
Emergency operation
Locking the vehicle 376
Lowering load assist 376
Unlocking storage
compartments 375
Unlocking the trunk 375
Unlocking the vehicle 374
Emergency operation (Limp Home
Mode) 177
Emergency Tensioning Device (ETD) 72,
440

455 Index
Light sensor 361
Replacing bulbs for rear 381, 385
Switching off 123
Switching on 123
Lamps, indicator and warning
ABS 27, 325
ABS/ESP 324
AIRBAG OFF 334
Airbag Off 68
Brakes 326
CHECK ENGINE 327, 328
Coolant 328
DTR* 210
Engine diagnostics 327, 328
ESP 82
Fuel reserve 330
SBC 85
Seat belts 332
SRS 63, 332
Turn signals 25Language
Multifunction display 149
Leather upholstery
Cleaning 321
License plate lamps 153, 381
Replacing bulbs 385
Light sensor 361
Lighter see Cigarette lighter
Lighting
Instruments 131
Interior 129
Settings (control system) 152
Trunk 130
Limiting the gear range 167
Limp Home Mode 177
Load assist 235
Lowering manually 376
Loading terminology 305
Loading the vehicle 282
Lock buttons 34
Door handle (KEYLESS-GO*) 60
Trunk (KEYLESS-GO*) 104Locking 56
Automatic while driving 110
Centrally from inside 111
Fuel filler flap 267
Global (SmartKey with
KEYLESS-GO*) 102
Global (SmartKey) 96
Storage compartments 230
Vehicle in an emergency 376
Low beam headlamps 51, 123, 381
Replacing bulbs 383
Lowering
Load assist manually 376
Roll bar 74
Luggage compartment, rear 232
Luggage cover 197
Messages in display 371
Opening/closing 197
Lumbar support adjustment 115