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Horn Switch Test

NOTE:
  • SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX under Supplemental Restrain System), precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before doing repairs or servicing
  • Check for a blown No 10(20 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 POWER RELAY TEST )
  1. Remove the steering column covers (see STEERING COLUMN COVER REMOVAL/INSTALLATION )
  2. Disconnect the dash board wire harness 20P connector (A) from the cable reel (B)
    Fig 1: Identifying Dash Board Wire Harness 20P Connector Terminals
    G05988895Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Connect dash board wire harness 20P connector 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 don't sound, go to step 4
  4. Remove the jumper wire from the horn switch 20P connector
  5. Check for continuity between dash board wire harness 20P connector terminal No 2 and body ground There should continuity
    • If there is continuity, go to step 6
    • If there is no continuity, repair open or high resistance in the wire, or poor ground (G501)
  6. Measure the voltage between dashboard wire harness 20P connector terminal No 1 and body ground There should be battery voltage
    • If there is battery voltage, replace the horns
    • If there is no battery voltage, repair an open in the wire, or faulty driver's MICU, replace the driver's under-dash fuse/relay box
  7. Reconnect dashboard wire harness 20P connector to the cable reel, then remove the driver's airbag assembly (see DRIVER'S AIRBAG REPLACEMENT )
  8. Connect cable reel subharness 20P connector 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 don't sound, repair open in the wire, or replace the cable reel (see CABLE REEL REPLACEMENT )
  9. Disconnect the cable reel subharness 20P connector (A)
    Fig 2: Identifying Cable Reel Subharness 20P Connector Terminals
    G05988896Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Check for continuity between terminal (T9) and cable reel subharness 20P connector terminal No 12 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 (T9)
    Fig 3: Checking Continuity Between Terminal (T9) And Cable Reel Subharness 20P Connector Terminal
    G05988897Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Check for continuity between cable reel subharness 20P connector 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 open in the wire, or replace the cable reel subharness
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