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Horn Wiring Circuit LR3
The is the wiring diagram for the dual horn circuit.
The Horn Relay, (R133), is not a big black thing hidden somewhere but instead what is called a FET, (and it is hidden)!

This is a Field Effect Transistor that is built into the circuit board that is mounted to the back of the fuse box that is located behind the lower glove box door on the passenger side of the 3. The related 15 amp fuse, 12P, is mounted in this fuse box and is often called F12P, where F is for fuse, and P is for Passenger compartment.

This is to help differentiate from another fuse and relay box, (the usual kind), that is located beside the starting battery in the Engine compartment. FxxE is often used in the naming of those fuses.
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