Horn Switch: Testing and Inspection

Horn Switch Test

'10 model

NOTE: SRS components are located in this area. Review the SRS component locations Locations, precautions and procedures Service and Repair before doing repairs or servicing.

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 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 (20 A) fuse.
- No. 24 (10 A) fuse in the under-dash fuse/relay box.
- MICU.
- Horn Service and Repair.
- An open or high resistance 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. Using a jumper wire, connect cable reel subharness 20P connector terminal No. 11 to body ground. The horn should sound.

- If the horn sounds, go to step 7.
- If the horn does not sound, replace the cable reel Service and Repair.





7. Using a jumper wire, connect the horn switch 1P positive terminal to body ground. The horn should sound.

- If the horn sounds, check the installation of the driver's airbag assembly and the steering wheel. If OK, replace the driver's airbag assembly Driver's Airbag Replacement.
- If the horn does not sound, repair an open in the wire.