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85 Ur-Q Horn Wiring Problem
This should be a simple wiring problem (after all, I trained on the 82 Coupe
fusebox!) so I must be missing something.
The horns on the 85 Ur-Q were never right since I bought the car 2 years ago.
Recently I went over a bump, there was a short sound from the horns (odd -
there shouldn't be any power to the horn unless the relay was energized) but
nothing when depressing the steering wheel horn ring.
Checked the horns themselves - one showed no resistance, the other had
resistance but didn't work. So replaced both horns. But depressing the
steering wheel horn ring did nothing!
The horn relay is number 7. Jumpering socket 34 (hot) to socket 32 (power to
horns) makes horns sound. On the coil side of the relay, the ground is via
the horn ring. This circuit checks out from socket 35 - when the horn ring
is depressed the ground circuit is completed. So the problem must be the
power side of the coil.
Relay terminal 33 is connected electrically to 2 pins under the fuse
panel. These pins correspond to a black yellow wire and to a brown wire in
the red connector plug which pushes over the pins. Both these wires are
This makes no sense to me and I cannot trace from the Bentley manual where the
error or fault lies. Any ideas or assistance would be much appreciated.