SMART forfour Owner's Manual page 201

Warning and indicator lamps in the instrument cluster
Problem
h
The yellow tyre pres-
sure monitor warning
lamp (pressure loss/
malfunction) flashes
for approximately
1 minute and then
remains lit.
h
You are driving and
the yellow tyre pres-
sure monitor warning
lamp (pressure loss/
malfunction) is lit.
Possible causes/consequences and M Solutions
There is no signal from the tyre pressure sensor of one or sev-
eral wheels, or the wheels fitted do not have suitable tyre
pressure sensors. The tyre pressure monitor was not restarted
after a wheel change.
G
WARNING
The system is possibly unable to recognise or register low tyre
pressure.
There is a risk of an accident.
X
Vehicles with a colour display: observe the additional dis-
play messages.
X
Have the faulty tyre pressure sensor replaced at a qualified
specialist workshop.
or
X
Fit wheels with suitable tyre pressure sensors.
or
X
Restart the tyre pressure monitor after a wheel change
Y
( page 254).
The tyre pressure monitor is activated automatically after
driving for a few minutes.
If the yellow tyre pressure monitor warning lamp continues to
remain on:
X
Drive on carefully.
X
Visit a qualified specialist workshop.
The tyre pressure is too low in at least one of the tyres, or the
tyre pressure difference between the wheels is too great.
X
Check the tyre pressures at the next opportunity
Y
( page 253).
X
If necessary, correct the tyre pressure.
X
Restart the tyre pressure monitor (
Y
page 254).
199
Z