Wiring diagram OBCII

Hello everyone.

Is somebody here willing to mail a wiring diagram from an E28 OBC type 2 to me? I'm a bit at loss as to where the brown wire with the small rectangular connector goes (this is the wire coming from the relais box, which powers the alarm horn). I know it connects to the big connector (C302) above the pedals but need to know the pin-number.

Also, it seems that the models for the American market used a seperate horn for the OBC alarm, which is mounted somewhere near the battery. Is it true that the European models use the standard horns for this purpose?

Thanks for your help!