System wiring diagram
Horns
Horn, left
Horn, right
Relay in the Body Domain Controller
Body Domain Controller (BDC)
Steering column switch cluster (SZL)
Signal path of horn:
When the horn is pressed the signal is received by the steering column
switch cluster (SZL).
The SZL sends the in
Message
The yellow warning light flashes
and is
then illuminated continuously. A Check
Control message is displayed. It may not
be possible to identify tire pressure losses.
Measure
A wheel without TPM wheel electronics, such
as an emergency wheel, is mounted: have
the wheels checked, if needed