2007 MERCEDES-BENZ R320CDI ECU

507 Practical hints
Battery
!The battery is a valve-regulated lead acid
(VRLA) battery, also referred to as “fleece”
battery. Such batteries do not require topping-up
of the electrolyte level. VRLA batteries therefore
do not have cell caps and the battery cover is
non-removable. Do not attempt to open the
battery as otherwise the battery will be dam-
aged.
Even though VRLA batteries do not require
topping-up of the electrolyte level and cannot be
opened to check the electrolyte level, the
battery condition must be checked periodically
by performing a battery conductance test. Refer
to Maintenance Booklet for battery condition
testing intervals.
As with any other battery, the battery may
discharge if the vehicle is not operated for an
extended period of time. You can connect a
battery maintenance charge unit tested and
approved for use on your vehicle model or dis-
connected the battery to prevent battery dis-
charge. Contact an authorized Mercedes-Benz
Light Truck Center for more information.!The factory-equipped VRLA battery is
leak-proofed. Only use a battery as replacement
that has the same security features and is of
identical size, voltage, and capacity as the
factory-equipped battery.
The battery, the battery ventilation and the later-
al plug must always be securely installed when
the vehicle is in operation.
Warning!G
Jump starting must only be done using the
jump-start contacts located in the engine
compartment (
page 514).
Warning!G
Failure to follow these instructions can re-
sult in severe injury or death.
Observe all safety instructions and precau-
tions when handling automotive batteries
(
page 506).
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.

512 Practical hints
Battery
Step 8 (Disconnecting)
fPositive terminal with cover
gNegative terminal
Disconnect battery negative lead from
negative terminal g.
Make sure the negative lead does not
come into contact with the positive
lead.
Remove the cover from positive
terminal f.
Disconnect battery positive lead from
positive terminal f.Step 9 (Removing)
Take out battery.
Step 10 (Reinstalling)
Carry out step 9 (page 512).
Battery, shown removed for illustration
bBattery ventilation hose
hVent plug
Carry out step 11 to reconnect the
battery (
page 512).
Carry out steps 7 through 1 in reverse
order to complete reinstall the battery,
(
page 511) to (page 508).
Step 11 (Reconnecting)
If the battery has been removed, carry
out step 9 (
page 512) before starting
the connecting procedure.
Open the driver’s door.
Make sure the SmartKey is removed
from the starter switch.
Vehicles with KEYLESS-GO*:
Make sure the vehicle’s on-board
electronics have status 0.
With the driver’s door opened, the
vehicle’s on-board electronics
have status 0, same as SmartKey
removed from the starter
switch (
page 41).!The battery, battery ventilation hoseb,
and vent plug h must always be securely
installed when the vehicle is in operation.

520 Practical hints
Fuses
The electrical fuses in your vehicle serve to
switch off malfunctioning power circuits.
If a fuse is blown, the components and
systems secured by that fuse will stop
operating.If a newly inserted fuse blows again, have
the cause determined and rectified by an
authorized Mercedes-Benz Center.
The following aids are available to help you
replace fuses. They are included with the
vehicle tool kit (
page 473):

Fuse chart
The fuse chart explains the fuse alloca-
tion and fuse amperages.

Spare fuses

Fuse extractor
The electrical fuses are located in different
fuse boxes:

on the passenger side of the engine
compartment (
page 521)

in the cargo compartment
(
page 521)

in the passenger compartment
(
page 522)Before replacing fuses:
Apply the parking brake (page 66).
Make sure automatic transmission is
set to position P (
page 199).
The gear position indicator in the
multifunction display should be on
P.
Turn off all electrical consumers.
Turn off the engine (page 67).
Remove the SmartKey from the starter
switch.
Vehicles with KEYLESS-GO*:
Open the driver’s door (this puts
the starter switch to position0,
same as with the SmartKey re-
moved from starter switch). The
driver’s door can then be closed
again.
Warning!G
Only use fuses approved by Mercedes-Benz
with the specified amperage for the system
in question and do not attempt to repair or
bridge a blown fuse. Using other than
approved fuses or using repaired or bridged
fuses may cause an overload leading to a
fire, and/or cause damage to electrical
components and/or systems. Have the
cause determined and remedied by an
authorized Mercedes-Benz Light Truck
Center
iA blown fuse must be replaced by an appro-
priate spare fuse (recognizable by its color or the
fuse rating given on the fuse) of the amperage
recommended in the fuse chart.
Any Mercedes-Benz Light Truck Center will be
glad to advise you on this subject.

521 Practical hints
Fuses
Fuse box in engine compartment
The main fuse box is located on the pas-
senger side of the engine compartment.
Open the hood (page 364).
1Clamp
2Main fuse box cover
Release clamp1.
Lift fuse box cover2 up.
Install fuse box cover in reverse order.
Close the hood after checking or re-
placing fuses (
page 366).
Fuse box in cargo compartment
The fuse box is located under the cargo
compartment cover on the right-hand side
of the spare wheel well.
Open the tailgate (page 123).
Lift the cargo compartment cover
(
page 472).
Secure cargo compartment cover with
strap (
page 473).
1Cover
Fold cover1 to the left as indicated by
the arrow.
!The fuse box cover must be installed
properly to prevent moisture and/or dirt from
entering the fuse box and possibly impairing fuse
operation.

559 Index
display messages
Microphone, Hands-free 33
Mirrors
Adjusting 48
Auto-dimming* 213
Exterior rear view mirrors 49
Interior rear view mirror 48, 212
Mobile phone see Telephone*
MON 542
Multicontour seats* 136
Multifunction display 159
Changing settings see Control system
menus and Control system sub-
menus
Selecting language 179
Standard display 163
Multifunction display
messages 433–471
ABS 435, 442
AIRMATIC* 470–471
Brake fluid 454
Brake pads 452Coolant 455–457
Cruise control 436
Doors 460
EBP 453
Engine coolant 455–457
Engine oil 366, 367, 458
ESP
®436, 441, 442
Fog lamps, Front* 464
Fog lamps, Rear 466
Front passenger front air
bag 445–448
Fuel cap 460
Gear selector lever 443
Headlamps 463–468
Hood 460
Key, SmartKey 462
Key, SmartKey with
KEYLESS-GO* 461, 462
Lamps 465
Lamps, exterior 463
Low tire pressure 449
Parking brake 443, 453
Parking lamps 466SmartKey with KEYLESS-GO* 461
SRS 444
Tele Aid* 469
Telephone* 469
Windshield washer fluid 469
Multifunction steering wheel 30, 160
Button operation 160
N
Navigation system* 173
See separate COMAND system operat-
ing instructions
Net, Parcel 315
Net, Partition* 308
Neutral gear position, Automatic
transmission 197, 201
New vehicle, Break-in period 346
Night security illumination 149, 185
Normal occupant weight 402
Number, Vehicle Identification
(VIN) 526, 527

563 Index
Seats 132
Adjusting 43
Easy entry/exit feature 132
Heating* 142
Memory function* 144
Multicontour seat* 136
Ventilation* 143
Securing cargo 299
Selector lever see Gear selector lever
Self-test
Lamps in the instrument cluster 420
OCS 93
Tele Aid* 331
Service and warranty information 10
Service intervals see Maintenance, Service
indicator 409
Service life
Tires 374
Vehicle battery 506
Service, Parts 524
Service see Maintenance
Service system see FSS PLUS
(Canada vehicles) or
Maintenance System (U.S. vehicles)Settings
AIRMATIC* 285
Clock 181
Comfort functions* 189
Control system menus 162, 164
Control system submenus 163, 165,
177
Date 181, 182
Distance warning function* 191
Factory, SmartKey 113
Factory, SmartKey with
KEYLESS-GO* 119
Individual, Vehicle 176
Instrument cluster 179
Language, multifunction display 180
Lighting 183
Memory function* 144
Resetting all, Control system 176
Selective, SmartKey 114
Selective, SmartKey with
KEYLESS-GO* 119
Time 181
Vehicle level control* 286
Shift program mode, Automatic
transmission 206Shifting, Automatic transmission 197
Side impact air bags 78
Side marker lamps
Cleaning lenses 413
Messages in the multifunction
display 466
Replacing bulbs 484, 485
Side windows see Power windows
Sidewall 403
SmartKey see Key, SmartKey 112
SmartKey with KEYLESS-GO* see Key,
SmartKey with KEYLESS-GO* 116
Snow chains 406
Snow tires see Winter tires
Spare fuses 472
Spare wheel 475, 534
Inflating 501
Mounting 498
Wheel bolts 472, 500
Speed settings
Cruise control 270
Distronic* 277
Speedometer 27
Spinning see Tires, Direction of rotation