Check Horn Operation

WARNING: This page is about a different car, the 2005 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

CHECKING HORN OPERATION

Step	Check	Yes	No
1 : CHECK HORN OPERATION. Make sure the horn sounds when the horn switch is pushed.	Does the horn sound?	Go to step 2.	Check the horn circuit.
2 : CHECK HORN OPERATION. Disconnect the keyless entry control unit harness connector. Ground the harness connector terminal with a suitable wire. Connector & terminal (B176) No. 13 - chassis ground:	Does the horn sound?	Replace the keyless entry control unit.	Check the harness for open circuits or shorts between the keyless entry control unit and horn relay.