The tire inflation pressure depends on the tire's
Driving or exposure to the sun will increase the
tire's temperature, thus increasing the tire infla‐
The tire inflation pressure is reduced when the
tire temperature falls again.
These circumstances may cause a warning
when temperatures fall very sharply.
Following a temperature-related warning, the tar‐
get pressures are displayed on the Control Dis‐
play again after a short distance.
Sudden tire pressure loss
The system cannot indicate sudden serious tire
damage caused by external circumstances.
Failure performing a reset
Tires with special approval: the system will not
function correctly if a reset was not performed,
for example a flat tire may be indicated although
the tire inflation pressures are correct.
The yellow warning light flashes and is
then illuminated continuously. A Check
Control message is displayed. It may not
be possible to identify tire pressure losses.
▷ A wheel without TPM wheel electronics is
mounted: have the wheels checked, if
▷ A wheel without TPM wheel electronics, such
as an emergency wheel, is mounted: have
the wheels checked, if needed.
▷ Malfunction: have the system checked.
▷ Interference caused by systems or devices
with the same radio frequency: after leaving
the area of the interference, the system auto‐
matically becomes active again.
▷ For tires with special approval: the system
was unable to complete the reset. Perform a
system reset again.
Declaration according to NHTSA/
FMVSS 138 Tire Pressure
Each tire, including the spare (if provided) should
be checked monthly when cold and inflated to
the inflation pressure recommended by the vehi‐
cle manufacturer on the vehicle placard or tire in‐
flation pressure label. (If your vehicle has tires of
a different size than the size indicated on the ve‐
hicle placard or tire inflation pressure label, you
should determine the proper tire inflation pres‐
sure for those tires.) As an added safety feature,
your vehicle has been equipped with a tire pres‐
sure monitoring system (TPMS) that illuminates
a low tire pressure telltale when one or more of
your tires is significantly under-inflated. Accord‐
ingly, when the low tire pressure telltale illumi‐
nates, you should stop and check your tires as
soon as possible, and inflate them to the proper
pressure. Driving on a significantly under-inflated
tire causes the tire to overheat and can lead to
tire failure. Under-inflation also reduces fuel effi‐
ciency 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 driver's responsibility
to maintain correct tire pressure, even if under-
inflation has not reached the level to trigger illu‐
mination of the TPMS low tire pressure telltale.
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 approxi‐
mately one minute and then remain continuously
illuminated. This sequence will continue upon
subsequent vehicle start-ups as long as the mal‐
Wheels and tires
Online Edition for Part no. 01405A10E93 - VI/20