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Horn Switch Test

NOTE:
  • SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before doing repairs or servicing.
  • Check for a blown No. 10 (15 A) fuse in the under-hood fuse/relay box. If it is blown, check for a faulty horn relay (built in the relay circuit board) (see RELAY CIRCUIT BOARD TEST ).
  1. Remove the steering column covers (see COLUMN COVER REMOVAL/INSTALLATION ).
  2. Disconnect cable reel connector A (20P) (A) from the cable reel (B).
    Fig 1: Locating Cable Reel Connector A (20P) And Cable Reel
    G08076742Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Connect cable reel connector A (20P) terminals No. 1 and No. 2 with a jumper wire. The horns should sound.
    • If the horns sound, go to step  7.
    • If the horns do not sound, go to step 4.
  4. Remove the jumper wire from cable reel connector A (20P).
  5. Check for continuity between cable reel connector A (20P) terminal No. 2 and body ground. There should be continuity.
    • If there is continuity, go to step 6.
    • If there is no continuity, repair an open or high resistance in the wire, or poor ground (G405).
  6. Measure the voltage between cable reel connector A (20P) terminal No. 1 and body ground. There should be battery voltage.
    • If there is battery voltage, check for continuity between the under-hood fuse/relay box connector B (14P) terminal No. 11 and the horns.

      If there is continuity, replace the horns. If there is no continuity, repair an open or high resistance in the wire.

    • If there is no battery voltage, repair an open or high resistance in the wire, or faulty driver's MICU; replace the driver's under-dash fuse/relay box (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL AND INSTALLATION ).
  7. Reconnect cable reel connector A (20P) to the cable reel, then remove the driver's airbag assembly (see DRIVER'S AIRBAG REPLACEMENT ).
  8. Connect cable reel connector C (20P) terminals No. 11 and No. 12 with a jumper wire. The horns should sound.
    • If the horns sound, go to step 9.
    • If the horns do not sound, replace the cable reel (see CABLE REEL REPLACEMENT ).
  9. Disconnect cable reel cable reel connector C (20P) (A).
    Fig 2: Locating Cable Reel Cable Reel Connector C (20P)
    G08076743Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Check for continuity between ground terminal (T6) and cable reel connector C (20P) terminal No. 12. There should be continuity.
    • If there is continuity, go to step 11.
    • If there is no continuity.
      • An open in the wire, replace the cable reel subharness.
      • Poor ground terminal connection(T6).
        Fig 3: Identifying Ground Terminal (T6) And Cable Reel Connector C (20P) Terminal No. 12
        G08076744Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Check for continuity between cable reel connector C (20P) terminal No. 11 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 or replace the driver's airbag assembly.
    • If there is no continuity, repair an open in the wire, or replace the cable reel subharness.
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