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Technology for driving comfort and safety
74
Tire Pressure Monitor
TPM*
The concept
TPM checks the inflation pressures of the four
mounted tires. The system notifies you if there is
a significant loss of pressure in one or more tires.
Functional requirement
In order to assure the reliable reporting of a flat
tire, the system must be reset while all tire infla-
tion pressures are correct.
Always use wheels with TPM electronics. Other-
wise, the system may malfunction.
Each time a tire inflation pressure has
been corrected or a wheel or tire has been
changed, reset the system.<
System limitations
TPM cannot warn you in advance of sud-
den severe tire damage caused by outside
influences.<
The system does not work correctly if it has not
been reset; for example, a flat tire may be indi-
cated even though the tire inflation pressures
are correct.
The system is inactive and cannot indicate a flat
tire if a wheel without TPM electronics, such as a
compact spare wheel
*
, has been mounted, or if
TPM is temporarily malfunctioning due to other
systems or devices using the same radio fre-
quency.
Status indicator on the onboard monitor
The tire and system condition is indicated by the
color of the tires.
TPM takes into account the fact that tire pres-
sure changes while the vehicle is being driven.
The tire pressure does not need to be corrected
unless the TPM instructs you to do so by means
of color indicators.
Green
The tire inflation pressure corresponds to the
established target value.
"TPM active" is displayed on the onboard moni-
tor.
One wheel yellow
There is a flat tire or substantial loss of tire pres-
sure in the indicated tire. A message appears on
the onboard monitor.
All wheels yellow
There is a flat tire or substantial loss of tire pres-
sure in several tires. A message appears on the
onboard monitor.
Gray
The system cannot detect a puncture.
Possible reasons for this:
> TPM is being reset
> Temporary malfunction caused by systems
or devices using the same radio frequency
> Malfunction
Online Edition for Part no. 01 41 2 601 140 - © 08/08 BMW AG
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