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Check Horn

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC 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 Kit.
  2. Turn the ignition switch to ON (engine OFF) and run the "PC application for Subaru Select Monitor".
  3. On<< System Selection Menu >> display, select {Integ. unit mode}.
  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 harness connector of main fuse box.
  4. Measure the resistance between harness connector terminals.

    Connector & terminal 

    (B279) No. 29 - (B186) No. 1: 

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