Mercedes-Benz GL450 Operator's Manual page 397

Operation
Tires and wheels
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Reactivate the TPMS after adjusting the tire
inflation pressure to the inflation pressure rec-
ommended for the vehicle operating condition.
Tire pressure should only be adjusted on cold
tires. Observe the recommended tire inflation
pressure on the placard on the driver's door
B-pillar ( page 384). Some vehicles may have
supplemental tire pressure information for driv-
ing at high speeds ( page 390) or for vehicle
loads less than the maximum loaded vehicle con-
dition ( page 390). If such information is pro-
vided, it can be found on the inside of the fuel
filler flap.
Press button è or ÿ on the mul-
tifunction steering wheel repeatedly
until the standard display menu ap-
pears in the multifunction display
( page 153).
Press the j or k button repeat-
edly until you see the following
message:
Tire pressure monitor
active
Menu: R-Button
396
Press the reset button ( page 151).
The following message will appear in
the multifunction display:
Restart tire
pressure monitor?
Press the æ button.
The following message will appear in
the multifunction display:
Tire pressure monitor
restarted
After driving a few minutes the system
verifies that the current tire inflation
pressures are within the system's
specified range. Afterwards the current
tire inflation pressures are accepted as
reference pressures and then moni-
tored.
If you wish to cancel activation:
Press the ç button.
Checking tire pressure electronically
with the Advanced Tire Pressure Moni-
toring System (Advanced TPMS)*,
(Canada only)
The TPMS only functions on wheels that
are equipped with the proper electronic
sensors. It monitors the tire inflation pres-
sure, 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 after a few
minutes' travel time.
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Possible differences between the readings
of a tire pressure gauge of an air hose, e.g. gas
station equipment, and the vehicle's control
system can occur. Usually the readings issued by
the control system are more precise.