5 Series E34 525td (M51) TOUR
Antenna
There is an antenna in each wheel housing.
Task:
receives telegrams and forwards these to
the RDC control unit.
Component description
Set button
Installed in the instrument panel to the right of the
steering wheel. (E46: in the centre console)
Symbol: tyre cross-section
Task:
initialisation after resetting cold tyre
pressure or after changing tyre or wheel
location.
Display element in instrument cluster
Indicator lamp lights up yellow:
- drop in tyre pressure of 0.2 to 0.4 bar
Indicator lamp lights up red:
- drop in tyre pressure greater than 0.4 bar
Tyre pressure warning RDW
RDW system description
RDW measures the wheel speeds on all four wheels, using the wheel speed sensors of the ABS/ASC or ABS/DSC
system. It compares the wheel speeds of the diagonally opposite wheels and of the average speed.
In the event of a drop in tyre pressure, the dynamic diameter of a wheel will change, leading to a changed wheel
speed.
A drop in tyre pressure of 30
±
10 % can be detected on all wheels from about 15 km/h (10 mph) up to the vehicle's
top speed.
SBT Tyres with emergency running characteristics and tyre pressure warning systems A
BMW AG - TIS
23.01.2013 11:53
Issue status (12/2007) Valid only until next DVD is issued
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