2008 MERCEDES-BENZ R320 sensor

408 Operation
Vehicle care
Restart the engine after cleaning sen-
sor cover1.
Cleaning the Parktronic* system
sensors
1Parktronic system sensors in front
bumper
Use a mild car wash detergent, such as
Mercedes-Benz approved Car
Shampoo, with plenty of water and a
soft, non-scratching cloth to clean
sensors1 on the bumpers.Cleaning the Rear View Camera lens*
1Camera lens
Only use clean water and a soft,
non-scratching cloth to clean camera
lens1.
Be careful not to apply wax to camera
lens1 when waxing the vehicle. If neces-
sary, remove the wax using the
Mercedes-Benz approved Car Shampoo
with plenty of water.
!To prevent scratches or damage, never
apply strong force and only use a soft,
non-scratching cloth when cleaning the sensor
cover1. Do not attempt to wipe dirty sensors
with a dry cloth or sponge.
!Do not apply strong pressure to the sensor
covers. Applying strong pressure may damage
the sensor covers.
Follow the instructions provided by the power
washer manufacturer on maintaining a distance
between the vehicle and the nozzle of the power
washer.
!To prevent scratches, never apply strong
force and only use a soft, non-scratching cloth
when cleaning the sensors. Do not attempt to
wipe dirty sensors with a dry cloth or sponge.

432 Practical hints
What to do if …
Display messagePossible cause/consequencePossible solution
DISTRONICAvailable AgainDistronic* had been deactivated and
is available again.Activate Distronic* (page 268).
Currently Unavailable
See Operator’s ManualDistronic* is deactivated because
the functionality is impaired by
external interferences, e.g.
high-frequency sources such as toll
stations, speed measuring systems
etc.Leave the area of the external
interference.
Activate Distronic* again (page 268)
when the message
DISTRONIC Available
Again
appears.
Distronic* is deactivated because
the Distronic* sensor has not
sensed any other vehicles or
objects, e.g. road sign or such, for a
long time.Try to activate Distronic* again
(
page 268) when the message
DISTRONIC Available Again appears.

433 Practical hints
What to do if …
Display messagePossible cause/consequencePossible solution
DISTRONICCurrently Unavailable
See Operator’s ManualDistronic* is deactivated because

the Distronic* cover in the
radiator grille is dirty

the functionality is impaired by
heavy precipitation or fog
Clean the Distronic* cover in the radiator
grille (
page 407).
Restart the vehicle.
Distronic* becomes operational again with-
out the engine being restarted when

dirt on the radiator grille has fallen off
while driving (e.g. slush or snow)

the system recognizes full sensor
availability due to lessening rain or
because the road is drying, for example

the message in the multifunction display
disappears
You can then operate Distronic* as usual
again.

443 Practical hints
What to do if …
Display messagePossible cause/consequencePossible solution
Tire Pressure Monitor
InoperativeThe TPMS or Advanced TPMS* is
malfunctioning.Have the TPMS or Advanced TPMS* checked by an
authorized Mercedes-Benz Light Truck Center.
Tire Pressure Monitor
Inoperative
No Wheel SensorsThere are wheels without appropriate wheel
sensors mounted (e.g. winter tires).Have the TPMS or Advanced TPMS* checked by an
authorized Mercedes-Benz Light Truck Center.
Have the wheel sensors installed by an authorized
Mercedes-Benz Light Truck Center.
Tire Pressure Monitor
Wheel Sensor MissingVehicles with Advanced TPMS*:
One or more sensors are defect (e.g.
battery is empty).
The respective tire is indicated by
---
instead of the tire inflation pressure in the
multifunction display.
Have the Advanced TPMS* checked by an autho-
rized Mercedes-Benz Light Truck Center.
Vehicles with Advanced TPMS*:
One or more wheels without appropriate
wheel sensors mounted (e.g. spare tire).
The respective tire is indicated by
---
instead of the tire inflation pressure in the
multifunction display.
Have the wheel sensors installed by an authorized
Mercedes-Benz Light Truck Center.
Tire Pressure Monitor
Currently UnavailableThe TPMS or Advanced TPMS* is unable to
monitor the tire pressure due to a nearby
radio interference source.As soon as the causes of the malfunction have been
removed, the TPMS or Advanced TPMS* automati-
cally becomes active again after a few minutes
driving.

455 Practical hints
What to do if …
Display symbolDisplay messagePossible cause/consequencePossible solution
.3rd Brake LampThe high mounted brake lamp is
malfunctioning. This message
will only appear if a critical
number of LEDs have stopped
working.Contact an authorized Mercedes-Benz
Light Truck Center as soon as possible.
Active Headlamps
InoperativeThe active Bi-Xenon* headlamp
system is malfunctioning.Contact an authorized Mercedes-Benz
Light Truck Center as soon as possible.
AUTO Light
InoperativeThe light sensor is malfunction-
ing. The headlamps switch on
automatically.Contact an authorized Mercedes-Benz
Light Truck Center as soon as possible.
To switch off the headlamps
(U.S. vehicles only):
In the control system, set lamp operation
to manual mode (
page 144).
Switch off the headlamps using the
exterior lamp switch (
page 143).
Brake Lamp
LeftThe left brake lamp is malfunc-
tioning. A substitute bulb is
being used.Replace the bulb as soon as possible
(
page 480).
Brake Lamp
RightThe right brake lamp is malfunc-
tioning. A substitute bulb is
being used.Replace the bulb as soon as possible
(
page 480).

501 Practical hints
Flat tire
Lowering the vehicle
Vehicles with scissors-type jack:
Attach ratchet to vehicle jack in such a
way that the wordDOWN can be seen.
Lower the vehicle until it is resting fully
on its own weight:
Vehicles with screw-type jack:
Turn crank counterclockwise.
Vehicles with scissors-type jack:
Turn ratchet in directionDOWN.
Remove the jack.1-5Wheel bolts
6Wheel wrench
Tighten the five wheel bolts evenly,
following the diagonal sequence
illustrated (1to5), until all bolts
are tight. Observe a tightening torque
of 110 lb-ft (150 Nm).
Store jack and all other vehicle tool kit
items back into the storage well.
Warning!G
Inflate collapsible tire only after the wheel is
properly mounted.
Inflate the collapsible tire using the electric
air pump (
page 499) before lowering the
vehicle.
Warning!G
Have the tightening torque checked after
changing a wheel. The wheels could come
loose if they are not tightened to a torque of
110 lb-ft (150 Nm).
iThe removed road wheel cannot be stored in
the spare wheel well under the cargo compart-
ment floor, but should be transported in the
cargo compartment wrapped in a protective
wrap.
Vehicles with TPMS or Advanced TPMS*:
Do not activate the tire inflation pressure moni-
tor until a full size wheel/tire with functioning
sensor has been placed back into service on the
vehicle.

549 Index
D
Date display, Setting 176
Daytime running lamp mode 145
Setting 177
Deep water see Standing water
Defogging windshield 216, 230
Defrosting, Front 214, 229
Defrosting, Rear 207
Delayed shut-off
Exterior lamps 179
Interior lighting 180
Department of Transportation see DOT
Diesel engine
Bleeding fuel system 502
Preglow indicator lamp 29
Diesel fuel see Fuel
Difficulties
While driving 62
With starting 55
Digital speedometer 157, 165
Dimensions, Vehicle 534
Direction of rotation (tires) 365Displays
Digital speedometer 157, 165
Distronic* (Canada only) 168, 265
Maintenance service indicator
message 400
Messages in the multifunction
display 427–466
Multifunction display 157
Outside temperature 155, 157, 165
Selecting 175
Showing malfunctions 169
Symbol messages 444
Text messages 429
Vehicle status message memory 169
Vehicle system settings, Control
system 161, 163, 170
Distance to empty (range), Trip
computer 185
Distance warning function* (Canada
only) 185Distronic* (Canada only) 262
Activating 268
Cleaning system sensor 407
Control system 267
Deactivating 271
Distance warning function* 275
Driving hints 273
Messages in the multifunction
display 431
Warning and indicator lamps 265
Door
Entry lamps 153
Locking, In an emergency 475
Locking/unlocking,
KEYLESS-GO* 113
Locking/unlocking, SmartKey 110
Messages in the multifunction
display 452
Opening from the inside 118
Opening from the outside 112
Remote door unlock (Tele Aid*) 328
Unlocking, Mechanical key 474
Door control panel 36
Door handle 36
Door windows see Power windows
DOT 388, 394

553 Index
H
Halogen headlamps see Headlamps
Hands-free microphone 33
Hard plastic trim items, cleaning 411
Hazard warning flasher 150
Head restraints
Active head restraint 86, 133
Front seats 45
Rear seats 135, 136
Headlamp cleaning system* 203, 362
Reservoir capacity 538
Headlamp shut-off delay see Delayed
shut-off, Exterior lamps
Headlamps
Automatic headlamp mode 144
Bi-Xenon* 481
Cleaning lenses 407
Cleaning system* 203, 362
Halogen 481
Light sensor, Messages in the
multifunction display 455
Manual headlamp mode 144
Messages in the multifunction
display 455–460
Replacing bulbs 480, 481
Switch 58, 143Headliner, Cleaning 411
Heated seats see Seats
Heated steering wheel* 318
High beam flasher 58, 148
High beam headlamps
Indicator lamp 29
Messages in the multifunction
display 456
Replacing 480
Switching on 58, 147
High mounted brake lamp 481
Hinged quarter windows* see
Power windows
Hood 356
Messages in the multifunction
display 452
Opening 356
Hooks
Loading 291
Horn 25
HVAC see Climate control or
Automatic climate control (3-zone)*
Hydroplaning 344I
Identification label see Labels
Ignition 40, 53, 66
Immobilizer 106
Indicator lamps see Lamps, Indicator and
warning
Infant and child restraint systems see
Children in the vehicle
Inflation pressure see Tires, Inflation
pressure
Information button see Tele Aid*
Infrared reflecting windshield* 336
Inside door handle 118
Instrument cluster 26, 154
Illumination brightness 154
Lamps 414
Messages in the multifunction
display 427–466
Multifunction display 157
Selecting language 174