BMW M4 COUPE Owner's Handbook Manual page 132

Controls
If there is a significant loss of tyre
inflation pressure
Message
A yellow warning lamp is illuminated in
the instrument cluster.
In addition, a symbol with the affected tyre is
shown in a Check Control message on the
Control Display.
Symbol Possible cause
There is a flat tyre or substantial
loss of tyre inflation pressure.
No reset has been performed on to
the system. The system uses the
tyre inflation pressures saved dur‐
ing the last reset for the warning.
Measure
Reduce your speed and carefully stop the ve‐
hicle. Avoid violent or sudden braking and
steering manoeuvres.
What to do in the event of a flat tyre
1. Identify the damaged tyre.
To do this, check the air pressure in all four
tyres, for example using the tyre inflation
pressure indicator of a flat tyre kit.
If all four tyres are inflated to the correct
tyre inflation pressures, the Tyre Pressure
Monitor might not have been reset. Per‐
form a reset.
If it is not possible to identify tyre damage,
contact a Service Partner of the manufac‐
turer or another qualified Service Partner or
a specialist workshop.
2. Repair the flat tyre, for example using a flat
tyre kit or by changing the wheel.
The use of sealant, for example a flat tyre kit,
can damage the TPM wheel electronics. In this
case, have the electronics replaced at the next
opportunity.
132
Safety
Online Edition for Part no. 01402981699 - VI/17
System limits
Temperature
The tyre inflation pressure depends on the
temperature of the tyre.
The tyre inflation pressure increases as the
tyre temperature increases, for example during
driving or due to exposure to sunlight.
Tyre inflation pressure decreases if the tyre
temperature drops.
Through this behaviour, a warning may be trig‐
gered if there are major temperature drops,
due to the given warning limits.
Sudden loss of tyre inflation pressure
No warning can be given by the system of ex‐
treme, sudden tyre failure caused by external
factors.
Reset not carried out
The system will not function correctly if a reset
has not been carried out, for example, a flat
tyre is reported in spite of the correct tyre
pressure.
Malfunction
The yellow warning lamp flashes and is
then illuminated continuously. A Check
Control message is shown. Tyre pres‐
sure losses cannot be detected.
In these cases:
▷ A wheel without TPM wheel electronics is
fitted: have the wheels checked if neces‐
sary.
▷ Malfunction: have the system checked.
▷ The system was unable to complete the
reset. Perform a system reset again.
▷ Fault due to systems or devices with the
same frequency: the system is automati‐
cally reactivated upon leaving the field of
interference.