BMW 5 Series Owners & Service Manuals

BMW 5 Series: Horn

System wiring diagram

System wiring diagram
Horns

  1. Horn, left
  2. Horn, right
  3. Relay in the Body Domain Controller
  4. Body Domain Controller (BDC)
  5. 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 information via the LIN bus to the Body Domain Controller.
  • The Body Domain Controller evaluates the information and activates the relay for the horn.

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