Horn Switch: Testing and Inspection

Horn Switch Test

1. Remove the steering column covers Service and Repair.

2. Disconnect the dashboard wire harness 20P connector (A) from the cable reel (B).






3. Using a jumper wire, connect the dashboard wire harness 20P connector terminal No. 1 to body ground. The horn should sound.

- If the horn sounds, go to step 4.
- If the horn does not sound, check these items:
- Battery terminal fuse box No. 3 (20A) fuse.
- No. 24 (10 A) fuse in the under-dash fuse/relay box.
- Horn Service and Repair.
- Horn relay (with security) Testing and Inspection.
- MICU(without security).
- An open in the wire.





4. Reconnect the dashboard wire harness 20P connector (A) to the cable reel (B).





5. Remove the driver's airbag assembly Driver's Airbag Replacement, and disconnect the horn switch 1P positive terminal (C) from the driver's airbag.

6. Check for continuity between the dashboard wire harness 20P connector terminal No. 1 and the steering wheel switch 20P connector terminal No. 11.

- If there is continuity, go to step 7.
- If there is no continuity, replace the cable reel Service and Repair.





7. Check for continuity between the steering wheel switch 20P connector terminal No. 11 and the horn switch 1P positive terminal.

- 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, repair an open in the wire.