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Check Horn

WARNING: This page is about a different car, the 2006 Subaru Outback and 2006 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
HORN CHECKING PROCEDURE CHART

Step Check Yes No
1 CHECK HORN OPERATION. 
Check the horn sounds when the horn switch is pushed.		 Does the horn sound? Go to step 2.  Check the horn circuit.
2 CHECK OUTPUT TO HORN RELAY. 
  1. Connect the Subaru Select Monitor to the data link connector.
  2. Turn the ignition switch to ON.
  3. Select {Integ. unit} from main menu.
  4. Select {Function Check}.
  5. Select {Horn Output} and execute
 Does the horn sound? Horn circuit is OK. Go to step 3. 
3 CHECK HORN RELAY CIRCUIT. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the harness connector of body integrated unit.
  3. Disconnect the main fuse box harness connector (B186).
  4. Measure the resistance between harness connector terminals.

    Connector & terminal 

    (B280) No. 11 - (B186) No. 1: 

 Is the resistance less than 10 Ω? Check the body integrated unit. < Ref. to BASIC DIAGNOSTIC PROCEDURE . > Repair the harness.
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