Check Security Horn

WARNING: This page is about a different car, the 2006 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

CHECK SECURITY HORN

Step	Check	Yes	No
1 CHECK SECURITY HORN RELAY. Remove and check the security horn relay. < Ref. to SECURITY HORN RELAY . >	Is the security horn OK?	Go to step 2.	Replace the security horn relay.
2 CHECK POWER SUPPLY FOR SECURITY HORN RELAY. Measure the voltage between the security horn relay harness connector terminal and chassis ground. Connector & terminal (B243) No. 1 (+) - Chassis ground (-):	Is the voltage more than 10 V?	Go to step 3.	Check the harness for open circuits and shorts between the security horn relay and horn relay.
3 CHECK POWER SUPPLY FOR SECURITY HORN RELAY. Measure the voltage between the security horn relay harness connector terminal and chassis ground. Connector & terminal (B243) No. 2 (+) - Chassis ground (-):	Is the voltage more than 10 V?	Go to step 4.	Check the harness for open circuits and shorts between the security horn relay and the fuse.
4 CHECK HARNESS BETWEEN SECURITY HORN RELAY AND KEYLESS ENTRY CONTROL UNIT. Measure the resistance between the security horn relay harness connector terminal and keyless entry control unit harness connector terminal. Connector & terminal (B243) No. 4 - (B93) No. 16:	Is the resistance less than 10 Ω?	Go to step 5.	Check the harness for open circuits and shorts between the security horn relay and keyless entry control unit.
5 CHECK SECURITY HORN. Remove and check the security horn. < Ref. to SECURITY HORN . >	Is the security horn OK?	Replace the keyless entry control unit.	Replace the security horn.