2008 MERCEDES-BENZ GL550 tire pressure monitor

405 Operation
Tires and wheels
Press buttonæ.
The following message will appear in
the multifunction display:
Tire Pressure Monitor
Restarted
After a few minutes driving, the current
tire inflation pressure values are ac-
cepted as reference values and then
monitored.
If you wish to cancel activation:
Press buttonç.Potential problems associated with
underinflated and overinflated tires
Underinflated tires
Underinflated tires can:

cause excessive and uneven tire wear

adversely affect fuel economy

lead to tire failure from being
overheated

adversely affect handling
characteristicsOverinflated tires
Overinflated tires can:

adversely affect handling
characteristics

cause uneven tire wear

be more prone to damage from road
hazards

adversely affect ride comfort

increase stopping distance
Warning!G
Follow recommended tire inflation
pressures.
Do not underinflate tires. Underinflated tires
wear excessively and/or unevenly,
adversely affect handling and fuel economy,
and are more likely to fail from being
overheated.
Warning!G
Follow recommended tire inflation
pressures.
Do not overinflate tires. Overinflated tires
can adversely affect handling and ride
comfort, wear unevenly, increase stopping
distance, and result in sudden deflation
(blowout) because they are more likely to
become punctured or damaged by road
debris, potholes etc.
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445 Practical hints
What to do if …
Warning!G
Each tire, including the spare (if provided),
should be checked monthly when cold and
inflated to the inflation pressure recom-
mended by the vehicle manufacturer on the
Tire and Loading Information placard on the
driver’s door B-Pillar or, if available, the tire
inflation pressure label on the fuel filler flap.
If your vehicle has tires of a different size
than the size indicated on the Tire and
Loading Information placard or, if available,
the tire inflation pressure label, you should
determine the proper tire inflation pressure
for those tires.
As an added safety feature, your vehicle has
been equipped with a tire pressure monitor-
ing system (TPMS) that illuminates a low tire
pressure telltale when one or more of your
tires is significantly underinflated. Accord-
ingly, when the low tire pressure telltale illu-
minates, you should stop and check your
tires as soon as possible, and inflate them to
the proper pressure. Driving on a significant-
ly underinflated tire causes the tire too over-
heat and can lead to tire failure.
Underinflation also reduces fuel efficiency
and tire tread life, and may affect the vehi-
cle’s handling and stopping ability. Please
note that the TPMS is not a substitute for
proper tire maintenance, and it is the driv-
er’s responsibility to maintain correct tire
pressure, even if underinflation has not
reached the level to trigger illumination of
the TPMS low tire pressure telltale.USA only:
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate
when the system is not operating properly.
The TPMS malfunction indicator is com-
bined with the low tire pressure telltale.
When the system detects a malfunction, the
telltale will flash for approximately 1 minute
and then remain continuously illuminated.
This sequence will continue upon subse-
quent vehicle start-ups as long as the
malfunction exists. When the malfunction
indicator is illuminated, the system may not
be able to detect or signal low tire pressure
as intended.
TPMS malfunctions may occur for a variety
of reasons, including the installation of in-
compatible replacement or alternate tires or
wheels on the vehicle that prevent the TPMS
from functioning properly. Always check the
TPMS malfunction telltale after replacing
one or more tires or wheels on your vehicle
to ensure that the replacement or alternate
tires and wheels allow the TPMS to continue
to function properly.
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465 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.
Have the wheel sensors installed by an authorized
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 Advanced TPMS* checked by an autho-
rized Mercedes-Benz Light Truck Center.
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.
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573 Index
Battery, Vehicle 528
Charging 535
Disconnecting and connecting 530
Jump starting 536
Removing and installing 530
Bead 416
Beverage holder see Cup holder
Bi-Xenon headlamps* see headlamps
Bolts, Spare wheel 494
Brake fluid 564
Checking 376
Messages in the multifunction
display 469
Brake lamp
Cleaning lenses 429
Messages in the multifunction
display 477
Replacing bulbs 511
Brake pads 348
Messages in the multifunction
display 467
Brakes 348
Warning lamp 437
Break-in period 346
Bulbs, replacing see Replacing bulbsButton for Voice control* system 30,
156
C
California retail buyers and lessees,
Important notice for 11
Camera see Rear view camera*
Can holder see Cup holder
Capacities and recommended
fuel/lubricants 562
Card holder 33, 37, 320
Cargo compartment cover blind 310
Cargo net* 312
Cargo tie-down rings 302
Carpets, Cleaning 433
Carriers* 295
Catalytic converter
(gasoline engine) 371
CD changer 165, 315
CD player 165
Center console
Lower part 33
Upper part (Vehicles with
enhanced off-road package*) 32
Upper part (Vehicles without
enhanced off-road package*) 31Central locking
Automatic 128
Locking/unlocking from the
inside 128
Switch 128
Certification label 550
CHECK ENGINE malfunction indicator
lamp 439, 440
Checking tire pressure electronically with
the Advanced Tire Pressure Monitoring
System (Advanced TPMS)*,
(Canada only) 401
Checking tire pressure electronically with
the Tire Pressure Monitoring System
(TPMS), (USA only) 398
Checklist
Off-road driving 357
Returning from off-road driving 363
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591 Index
Hands-free microphone 34
Inserting in cradle 329
Installing a different mobile phone
cradle 331
Messages in the multifunction
display 483
Operation 186
Phone book 187
Redialing 188
Rejecting/ending a call 187
Removing from cradle 330
Tray 317
Temperature
Coolant 162
Display mode, Status indicator 173
Interior temperature 219
Interior temperature, setting see
Climate control or Automatic climate
control (3-zone)*
Outside temperature 163
Sensor, Interior temperature 216,
230
Sensor, Outside temperature 153
Setting display unit 163Tether attachment points, see Children in
the vehicle
Third-row sunshade 212
Three-zone Automatic climate control see
Automatic climate control (3-zone) *
Ticket holder 320
Tie-down rings 302
Tightening torque
Screws, crossbars* 298, 299, 300
Wheel bolts 526
Tilt/sliding sunroof* see Power tilt/sliding
sunroof*
Time 174
TIN 410, 417
Tire and Loading Information
Placard 388
Terminology 415
Tire Identification Number see TINTire inflation pressure
Checking manually 395
Checking tire pressure electronically
with the Advanced Tire Pressure
Monitoring System (Advanced
TPMS)*, (Canada only) 401
Checking tire pressure electronically
with the Tire Pressure Monitoring
System (TPMS), (USA only) 398
Recommended tire inflation
pressure 393
Tires 384, 555
Advanced Tire Pressure Monitoring
System (Advanced TPMS)*,
(Canada only) 401
Air pressure 415
Care and maintenance 385
Chains 421
Cleaning 386
Combination low tire pressure/TPMS
malfunction telltale, USA only 27
Direction of rotation, Spinning 387
Driving instructions 351
Hydroplaning 352
Important guidelines 384
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592 Index
Important notes, Tire inflation
pressure 394
Inflation pressure 377, 393, 395
Information placard 388
Inspection 385
Load rating 406, 407, 417
Loading Information 388
Loading terminology 415
Loading the vehicle 387
Low tire pressure telltale, Canada
only 27, 444
Maximum load 418
Messages in the multifunction
display 444
Ply composition and material
used 418
Problems under-/overinflation 405
Retreads 384
Rims and tires 555
Rotating 387
Run Flat Indicator (Canada only) 396
Service life 385
Sizes 406
Snow chains 421
Spare wheel 494, 520
Speed rating 353, 408, 418Storing 386
Temperature 394, 414
Terminology 415
TIN 410, 417
Tire Identification Number see TIN
Tire Pressure Monitoring System
(TPMS), (USA only) 398
TPMS malfunction telltale 444
Traction 352, 414, 418
Tread 418
Tread depth 386, 420
Treadwear indicators 418
Vehicle maximum load on 418
Wear pattern 419
Winter tires 420
Tongue Weight Rating see TWR
Tools 490
Top tether
Children in the vehicle 96
Towing
Trailer 197, 364, 367
Towing eye bolt 540
Towing the vehicle 540, 542
Tow-starting 536, 538Traction 414, 418
4-ETS, Driving safety systems 101,
107
Trailer
Attaching 366
Checking weights 366
Electrical connections 365
Hitch* 364
Loading 365
Towing 364, 367
Weights and ratings 365
Transfer case 201
LOW RANGE mode* 201
Switching LOW RANGE mode* 202
Transmission gear selector lever see
Gear selector lever
Transmission position indicator 155
Transmission positions 192
Transmission see Automatic transmission
Traveling abroad 370
Tread 418
Tread depth 386, 420
Treadwear indicators 418
Trip computer 184
Trip odometer, resetting 153
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