Horn circuit for kia rio 2003 horn does not sound. fuse is ok relay is ok. can not locate horn on car . would like circuit diagram

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It is unlikely the horn is the problem. We do not have a circuit diagram but here is what I do have:

HORN TRIGGER (-) LT.GREEN/RED Harness Coming From Steering Wheel At
Steering Column, when the horn button is pushed this should be a ground circuit.

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