Horn Circuit Troubleshooting (2014 2015)

NOTE: SRS components are located in this area. Review the SRS component locations , and precautions and procedures before performing repairs or servicing.

1. Problem verification

   -1. Push the horn switch.

   Does the horn sound?

   YES 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

   NO 

   Go to step 2.

2. Fuse check

   -1. Check the following fuse.

   Fuse	No. B11 (10 A)
   Location	Main under-hood fuse box

   Is the fuse OK?

   YES 

   Go to step 3.

   NO 

   Replace the fuse, and recheck. If the fuse blows again, repair a short in the No. B11 (10 A) fuse circuit.

3. Horn relay check

   -1. Remove the horn relay from the under-hood fuse/relay box, and test it .

   Is the relay OK?

   YES 

   Go to step 4.

   NO 

   Replace the horn relay, then recheck.

4. Open wire check (+B HORN line)

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Horn relay: disconnected
   Test circuit	+B HORN
   Test point 1	Horn relay 4P socket No. 1 (WHT)
   Test point 2	Body ground

   Test point 1	Horn relay 4P socket No. 3 (WHT)
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   The +B HORN wire is OK. Go to step 5.

   NO 

   Repair an open or high resistance in the wire.

5. Determine possible failure area (horn relay switch side circuit, horn relay coil side circuit)

   -1. Connect terminals A and B with a jumper wire.

   Terminal A	Horn relay 4P socket No. 1 (WHT)
   Terminal B	Horn relay 4P socket No. 2 (BLK)

   Courtesy of HONDA, U.S.A., INC.

   Does the horn sound?

   YES 

   Go to step 6.

   NO 

   Go to step 9.

6. Open wire check (HORN RLY CL- line) 1

   -1. Remove the driver's airbag assembly .

   -2. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   Test circuit	HORN RLY CL-
   Test point 1	Cable reel connector A (20P) No. 10 (ORN)
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   Go to step 7.

   NO 

   Repair an open or high resistance in the wire.

7. Cable reel check

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   Test circuit	HORN RLY CL-
   Test point 1	Cable reel connector C (20P) No. 1 (PNK)
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   Go to step 8.

   NO 

   Replace the cable reel .

8. Open wire check (HORN RLY CL- line) 2

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   Test circuit	HORN RLY CL-
   Test point 1	Horn switch 1P connector No. 1 (PNK)
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   The HORN RLY CL- wire is OK. Check the installation of the driver's airbag assembly and the steering wheel. If the horn switch plate is OK, replace the driver's airbag assembly .

   NO 

   Repair an open or high resistance in the wire.

9. Open wire check (HORN RLY OUT line)

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Horn relay: disconnected Horn relay 4P socket No. 1 (WHT) and No. 2 (BLK): jumped
   Test circuit	HORN RLY OUT
   Test point 1	Horn (LOW)/ (HIGH) 1P connector No. 1 (BLK)
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   The HORN RLY OUT wire is OK. Remove the horn, and test it . If the horn is OK, check the horn ground.

   NO 

   Repair an open or high resistance in the wire.