The horn switch may be stuck in activated position.
â–¶ How to fix
Check signals from the Horn switch in the steering wheel (pin C12).
What you'll see
No driver-visible symptom recorded.
System reaction
System reaction: Horn output will be turned off after 30 seconds. 15 seconds later, the DTC is set to avoid driver related trouble codes.
Diagnostic depth
Detection
Horn input is out of order.
Possible cause
Horn input signal is shorted to GND.