FixVault

Check Horn Operation

WARNING: This page is about a different car, the 2005 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.
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. 
  1. Disconnect the keyless entry control module harness connector.
  2. 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 module. Check the harness for open circuits and/or shorts between the keyless entry control module and horn relay.