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'09-11 Models

NOTE: Check for a blown No. 7 (15A) fuse in the underhood fuse/relay box. If it is blown, check for a faulty horn relay.
  1. Remove the steering column covers (see STEERING COLUMN REMOVAL AND INSTALLATION ).
  2. Disconnect the dashboard wire harness B (13P) connector (A) from the cable reel (B).
    Fig 1: Identifying Dashboard Wire Harness B (13P) Connector & Cable Reel
    G00485517Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Connect the dashboard wire harness B (13P) connector terminals No. 1 and No. 13 to body ground with a jumper wire. The horns should sound.
    • If the horn sounds, go to step  7.
    • If the horn doesn't sound, go to step  4.
  4. Remove the jumper wire from the dashboard wire harness B (13P) connector.
  5. Check for continuity between dashboard wire harness B (13P) connector terminal No. 13 and body ground. There should be continuity.
    • If there is continuity, go to step  6.
    • If there is no continuity, repair an open in the wire, or poor ground (G401).
  6. Measure the voltage between dashboard wire harness B (13P) connector terminal No. 1 and body ground. There should be battery voltage.
    • If there is battery voltage.
      • Repair an open in the wire between under-hood fuse/relay box connector D (14P) terminal No. 2 and horn.
      • Faulty horn.
      • Faulty horn relay.
    • If there is no battery voltage.
      • Repair an open in the wire.
      • Faulty horn relay
      • Faulty multiplex control unit; replace the under-dash fuse/relay box.
  7. Reconnect dashboard wire harness B (13P) connector to the cable reel, then remove the driver's airbag assembly (see DRIVER S AIRBAG REPLACEMENT ).
  8. Connect the cable reel subharness 13P connector terminals No. 1 and No. 13 with a jumper wire. The horn should sound.
    • If the horn sound, go to step  9.
    • If the horn doesn't sound, an open in the wire; replace the cable reel (see CABLE REEL REPLACEMENT ).
  9. Disconnect the cable reel subharness 13P connector (A).
    Fig 2: Identifying Cable Reel Subharness 13P Connector
    G00485518Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Check for continuity between terminal (A) and cable reel subharness 13P connector terminal No. 13. There should be continuity.
    • If there is continuity, go to step  11.
    • If there is no continuity.
      • Open in the wire, replace the cable reel subharness.
      • Poor terminal (T151).
      • Fig 3: Checking For Continuity Between Terminal & Cable Reel Subharness 13P Connector Terminal No. 13
      G00485519Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Check for continuity between cable reel subharness 13P connector terminal No. 1 and horn switch positive terminal 1P. There should be continuity.
    • If there is continuity, check or adjust the installation of the driver's airbag assembly and the horn switch plate (see STEERING WHEEL DISASSEMBLY/REASSEMBLY ).
    • If there is no continuity, repair an open in the wire, or replace the cable reel subharness.
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