Horn Switch Test

Remove the driver's dashboard undercover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ), and the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ), then remove the steering column covers (see STEERING COLUMN REMOVAL AND INSTALLATION ).
Disconnect the 20P connector (A) from the cable reel (B).

Fig 1: Identifying 20P Connector Of Cable Reel
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Using a jumper wire, connect the dashboard wire harness 20P connector terminal No. 4 to body ground. The horns should sound.
- If the horns sound, go to step 4.
- If the horns don't sound, check these items:
  - No. 13 (15 A) fuse in the under-hood fuse/relay box
  - Relay control module in the under-hood fuse/relay box
  - Horns (see CIRCUIT DIAGRAM )
  - An open in the wire
  Fig 2: Connecting Dashboard Wire Harness 20P Connector Terminal No. 4 To Body Ground Using Jumper Wire
  Courtesy of AMERICAN HONDA MOTOR CO., INC.
Reconnect the 20P connector (A) to the cable reel (B).

Fig 3: Identifying 20P Connector, Cable Reel And Horn Switch 1P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the driver's airbag assembly (see DRIVER'S AIRBAG REPLACEMENT ), and disconnect the horn switch 1P connector (C) from the driver's airbag.
Check for continuity between the cable reel 20P connector terminal No. 4 and the horn switch terminal 1 P. There should be continuity.
- If there is continuity, check the installation of the driver's airbag assembly and the steering wheel. If OK, replace the driver's airbag assembly.
- If there is no continuity, check these items:
  - Cable reel
  - An open in the wire
  Fig 4: Checking Continuity Between Cable Reel 20P Connector Terminal No. 4 And Horn Switch Terminal 1P
  Courtesy of AMERICAN HONDA MOTOR CO., INC.