Mercedes-Benz 2009 CLK-Class Operator's Manual page 320

Practical hints
What to do if ...
Underinflation also reduces fuel efficiency
and tire tread life, and may affect the
vehicle'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 underinflation
has not reached the level to trigger
illumination of the TPMS low tire pressure
telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate
Lamp in center console
Problem
56
The front passenger front air bag
off indicator lamp illuminates and
remains illuminated with the
weight of a typical adult or
someone larger than a small
individual on the front passenger
seat.
318
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 remain
continuously illuminated. This sequence
will continue upon subsequent vehicle
start-ups as long as the malfunction exists.
When the malfunction indicator is
illuminated, the system may not be able to
Possible cause/consequence
The system is malfunctioning.
detect or signal low tire pressure as
intended.
TPMS malfunctions may occur for a variety
of reasons, including the installation of
incompatible replacement or alternate tires
or wheels on the vehicle that prevent the
TPMS from functioning properly. Always
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.
Suggested solutions
X
Have the system checked as soon as possible at an authorized
Mercedes-Benz Center.
X
Read and observe messages in the multifunction display and follow
corrective steps ( Y page 279).