The horn receives a power supply via relay switch T03, located in the engine compartment junction unit B001, via the direct battery line protected by fuse F10 of the same junction unit.

This direct battery power supply is protected upstream by fuse F70 (CVM) of the maxifuse box on the battery B099 (connector A).

The coil for relay switch T03 is energized by an earth signal when the switch on the steering wheel is closed (pin 8 of the clock spring D047).

Relay switch T03 thereby supplies the horn P005 from pin 27 of connector A of the engine compartment junction unit B001.

The horn P005 is connected to the right front earth C011.