Tire pressure loss warning system (Canada only)
Important safety notes
While the vehicle is in motion, the tire pressure loss warning system monitors the set tire pressure using the rotational speed of the wheels. This enables the system to detect significant pressure loss in a tire. If the speed of rotation of a wheel changes as a result of a loss of pressure, a corresponding warning message will appear in the multifunction display.
WARNING
If the Check Tire Pressure Soon message
appears in the multifunction display, one or
more tires are significantly underinflated.
Stop the vehicle as soon as possible and inflate the tires to the pressure specified on the vehicle's Tire and Loading Information placard or (where available) in the tire pressure table.
Driving on a significantly underinflated tire causes the tire to overheat and can lead to tire failure. Underinflation also reduces fuel efficiency and tire tread life, and may affect the vehicle's handling and stopping ability.
Check all tires when cold, including the spare tire, at least once a month. The tires should be inflated to the recommended pressure.
This information can be found:
- on the Tire and Loading Information placard
on the B-pillar on the driver's side
or
- in the table for the tire pressure on the
inside of the fuel filler flap
WARNING
The tire pressure loss warning system does
not provide a warning for wrongly selected tire
inflation pressures. Always adjust tire
inflation pressure according to the Tire and
Loading Information placard on the driver's
door B-pillar or on the tire inflation pressure
label located on the inside of the fuel filler flap.
The tire pressure loss warning system does not replace regular checks of the tire inflation pressures since a gradual pressure loss in more than one tire cannot be detected by the tire pressure loss warning system.
The tire pressure loss warning system is not able to issue a warning due to a sudden dramatic loss of tire inflation pressure (e.g.
tire blowout caused by a foreign object). In this case bring the vehicle to a halt by carefully applying the brakes and avoiding abrupt steering maneuvers.
The function of the tire pressure loss warning system is limited or delayed if:
- snow chains are mounted to your vehicle's tires.
- road conditions are wintry.
- you are driving on sand or gravel.
- you adopt a very sporty driving style (cornering at high speeds or driving with high rates of acceleration).
- you are driving with a heavy load (in the vehicle or on the roof).
Restarting the tire pressure loss warning system
Restart the tire pressure loss warning system if you have:
- changed the tire pressure
- changed the wheels or tires
- mount new wheels or tires
•► Before restarting, consult the Tire and Loading Information placard on the B-pillar on the driver's side or the tire pressure table on the inside of the fuel filler flap to ensure the tire pressure in all four tires is set correctly for the current operating conditions.
•► Observe the notes in the section on tire pressures
WARNING
The tire pressure loss warning system can
only give reliable warnings if you have set the
correct tire pressure.
If an incorrect tire pressure is set, these incorrect values will be monitored.
A tire with insufficient pressure results in vehicle instability when driving, thus increasing the risk of an accident.
•► Make sure that the SmartKey is in position 2 in the ignition lock.
•► Press the 
button to select
the
Serv. menu.
•► Press the 
button to select
Tire Pressure.
•► Press the 
button.
The Run Flat Indicator Active Press 'OK' to Restart message appears in the multifunction display.
If you wish to confirm the restart:
•► Press the button.
The Tire Pressure Now OK? message appears in the multifunction display.
•► Press to select Yes.
•► Press the button.
The Run Flat Indicator Restarted message appears in the multifunction display.
After a teach-in period, the tire pressure loss warning system will monitor the set tire pressures of all four tires.
If you wish to cancel the restart:
•► Press the 
button.
or
•► If the Tire Pressure Now OK? message
appears, press to select
Cancel.
•► Press the button.
The tire pressure values stored at the last restart will continue to be monitored.
See also:
DOT, Tire Identification Number (TIN)
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has to imprint a TIN in or on the sidewall of each tire produced.
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to activate the mbrace service. Ensure that
your system is activated and ready for use,
and press the MB Info call button
to
...