Page 375 of 666

373 Operation
Tires and wheels
4
\1
Switch on the ignition (
\2
page 111).
\1
Press the 5menu button on the in-
strument cluster until you see the +CAL TPMS
message in the display.
\1
Press the ,menu button on the in-
strument cluster.
The following message is displayed:OK TPMSThe tire pressure monitor activation
process has begun.
The tire pressures of the individual
wheels are stored as the new refer-
ence values if they are determined to
be plausible for the tire pressure
monitor.If you wish to cancel the activation pro-
cess:
\1
Press the .button or the 5menu but-
ton on the instrument cluster.
The activation process is canceled
automatically if 30 seconds elapse
with no input.
Checking tire inflation pressure elec-
tronically with the Tire Pressure Mon-
itoring System (TPMS)* (vehicles
with steering wheel buttons)Vehicles with steering wheel buttons are
equipped with the Advanced Tire Pres-
sure Monitoring System.
iUSA only:
The Tire Pressure Monitoring System
(TPMS) is equipped with a combina-
tion low tire pressure/TPMS mal-
function telltale in the instrument
cluster (
\2
page 20). Depending on
how the telltale illuminates, it indi-
cates a low tire pressure condition or
a malfunction in the TPMS system it-
self:
If the telltale illuminates continuous-
ly, one or more of your tires is signif-
icantly underinflated. There is no
malfunction in the TPMS.
nf_BA.book Page 373 Friday, January 25, 2008 3:53 PM
Page 376 of 666

374 OperationTires and wheels
4
The TPMS only functions on wheels that
are equipped with the proper electronic
sensors. It monitors the tire inflation
pressure, as selected by the driver, in all
four tires. A warning is issued to alert
you to a decrease in pressure in one or
more of the tires.
Tire pressure inquiries are made using
the multifunction display. The present
inflation pressures are displayed only af-
ter a few minutes’ travel time.
\1
Switch on the ignition (
\2
page 111).
\1
Press the
j
or
k
button until
the current inflation pressures for
each tire appear in the multifunction
display. If the telltale flashes for 60 seconds
and then stays illuminated, the TPMS
system itself is not operating proper-
ly.
iCanada only:
The Tire Pressure Monitoring System
(TPMS) is equipped with a low tire
pressure telltale in the instrument
cluster (
\2
page 20). If the telltale il-
luminates, one or more of your tires
is significantly underinflated.
iPossible differences between the
readings of a tire pressure gauge of
an air hose, e.g. gas station equip-
ment, and the vehicle’s control sys-
tem can occur. Usually the readings
issued by the control system are
more precise.
nf_BA.book Page 374 Friday, January 25, 2008 3:53 PM
Page 377 of 666
375 Operation
Tires and wheels
4 i
When the message
Tire pres. dis-
played after driving for several
minutes
appears in the multifunction
display, the individual inflation pres-
sure values are matched with the
tires. The individual values are dis-
played after a few minutes' driving.54.32-2278-31
Warning
G
It is the driver’s responsibility to calibrate
the TPMS on the recommended cold infla-
tion pressure. Underinflated tires affect
the ability to steer or brake the vehicle.
You might lose control over the vehicle.
iIf a spare wheel without wheel sen-
sors is mounted, the system may still
indicate the tire inflation pressure of
the removed wheel for some min-
utes. If this happens, keep in mind
that the indicated value where the
spare wheel is mounted does not re-
flect the actual spare tire inflation
pressure.
nf_BA.book Page 375 Friday, January 25, 2008 3:53 PM
Page 378 of 666

376 OperationTires and wheels
4
Warning
G
The TPMS does not warn you against in-
correctly selected tire inflation pressure
and does not warn you when the tire pres-
sure is not properly selected for the re-
spective vehicle load. It warns you only
when the pressure of one or more tires
decreases significantly below the refer-
ence inflation pressure which was stored
at the time of calibration of the TPMS af-
ter you inflated the tires.Always ensure that you recalibrate the
TPMS after you have inflated the tires to
the recommended cold inflation pressure.
Continued
Warning (Continued)
G
Always adjust the tire inflation pressure
according to the tire and loading informa-
tion placard on the driver’s door B-pillar.Underinflated tires wear excessively and/
or unevenly, adversely affect handling and
fuel economy, and are more likely to fail
from being overheated.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.
Continued
Warning (Continued)
G
The TPMS is not able to issue a warning
due to a sudden dramatic loss of pressure
(e.g. tire blowout caused by a foreign ob-
ject). In this case bring the vehicle to a
halt by carefully applying the brakes and
avoiding abrupt steering maneuvers.
nf_BA.book Page 376 Friday, January 25, 2008 3:53 PM
Page 379 of 666

377 Operation
Tires and wheels
4
Warning
G
Each tire, including the spare (if provided),
should be checked monthly when cold
and inflated to the inflation pressure rec-
ommended by the vehicle manufacturer
on the vehicle placard or the tire inflation
pressure label. (If your vehicle has tires of
a different size than the size indicated on
the vehicle placard or the tire inflation
pressure label, you should determine the
proper tire inflation pressure for those
tires).
Continued
Warning (Continued)
G
As an added safety feature, your vehicle
has been equipped with a Tire Pressure
Monitoring System (TPMS) that illumi-
nates a low tire pressure telltale when one
or more of your tires is significantly under-
inflated. Accordingly, when the low tire
pressure telltale illuminates, you should
stop and check your tires as soon as pos-
sible, and inflate them to the proper pres-
sure. Driving on a significantly
underinflated tire causes the tire to over-
heat and can lead to tire failure.
Continued
Warning (Continued)
G
Underinflation also reduces fuel efficiency
and tire tread life, and may affect the ve-
hicle’s handling and stopping ability.
Please note that the TPMS is not a substi-
tute for proper tire maintenance, and it is
the driver’s responsibility to maintain cor-
rect tire pressure, even if underinflation
has not reached the level to trigger illumi-
nation of the TPMS low tire pressure tell-
tale.
Continued
nf_BA.book Page 377 Friday, January 25, 2008 3:53 PM
Page 380 of 666

378 OperationTires and wheels
4
Warning (Continued)
G
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 combined
with the low tire pressure telltale. When the
system detects a malfunction, the telltale will
flash for approximately 1 minute and then re-
main continuously illuminated. This se-
quence will continue upon subsequent
vehicle start-ups as long as the malfunction
exists. When the malfunction indicator is illu-
minated, the system may not be able to de-
tect or signal low tire pressure as intended.
Continued
Warning (Continued)
G
TPMS malfunctions may occur for a vari-
ety of reasons, including the installation
of incompatible replacement or alternate
tires or wheels on the vehicle that prevent
the TPMS from functioning properly. Al-
ways 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.
iIf a condition causing the TPMS to
malfunction develops, it may take up
to 10 minutes for the system to sig-
nal a malfunction using the TPMS
telltale flashing and illumination se-
quence.
The telltale extinguishes after driving
a few minutes if the malfunction has
been corrected.iOperating radio transmission equip-
ment (e.g. wireless headsets, two-way
radios) in or near the vehicle could
cause the TPMS to malfunction
nf_BA.book Page 378 Friday, January 25, 2008 3:53 PM
Page 381 of 666

379 Operation
Tires and wheels
4
Reactivating the Advanced TPMSThe TPMS must be reactivated when you
have adjusted the tire inflation pressure
to a new level (e.g. because of different
load or driving conditions). The TPMS is
then recalibrated to the current tire in-
flation pressures.
\1
Make sure the tire inflation pressure
of all four tires is correct, using the
tire and loading information placard
1
or the tire inflation pressure placard
located on the driver’s door B-pillar
(
\2
page 362).
Warning!
G
It is the driver’s responsibility to calibrate
the TPMS on the recommended cold infla-
tion pressure. Underinflated tires affect
the ability to steer or brake the vehicle.
You might lose control over the vehicle.
1. For vehicles with a gross weight capacity less
than 10 000 lbs (4 536 kg) (USA only).
iReactivate the TPMS after adjusting
the tire inflation pressure to the infla-
tion pressure recommended for the
vehicle operating condition. Tire in-
flation pressure should only be adju-
sted on cold tires. Observe the
recommended tire inflation pressure
on the tire and loading information
placard
1 or on the tire inflation pres-
sure placard on the driver’s door B-
pillar (\2
page 362).
nf_BA.book Page 379 Friday, January 25, 2008 3:53 PM
Page 480 of 666
478 Practical hintsWhat to do if ...
5
Problem
Possible cause / result
Suggested solutions
X
USA only:
Combination low tire pressure/
TPMS malfunction telltale for
TPMS lights up continuously.
Canada only:
Low tire pressure telltale for
TPMS lights up continuously.
WARNING
G
The TPMS detects a loss of pressure in at least
one tire.
\1Carefully bring the vehicle to a halt,
avoiding abrupt steering and braking
maneuvers. Observe the traffic situa-
tion around you.
\1Read and observe messages in the mul-
tifunction display.
If the tire inflation pressure in the respec-
tive tire(s) has (have) been corrected, the
combination low tire pressure/TPMS mal-
function telltale goes out after a few min-
utes of driving.
nf_BA.book Page 478 Friday, January 25, 2008 3:53 PM