Horn Switch: Testing and Inspection

Horn Switch Test

NOTE:
* SRS components are located in this area. Review the SRS component locations Locations, and precautions and procedures Service and Repair before performing repairs or servicing.
* Before testing, make sure the No. A14 (10 A) fuse in the under-hood fuse/relay box is OK.

1. Turn the steering wheel 180°from the center position and remove the cover.

2. Disconnect the horn switch 1P connector.

3. Connect horn switch 1P connector terminal No. 1 and body ground with a jumper wire.





* If the horns do not sound, go to step 4.
* If the horns sound, go to step 11.
4. Remove the jumper wire from the horn switch 1P connector.

5. Remove the driver's airbag assembly Drivers Airbag Removal And Installation.

6. Disconnect cable reel connector C (20P) from the cable reel.

7. Check for continuity between cable reel connector C (20P) terminal No. 14 and horn switch 1P connector terminal No. 1.





* If there is continuity, go to step 8.
* If there is no continuity, repair an open or high resistance in the wire.
8. Remove the steering column covers Steering Column Cover Removal/Installation.

9. Disconnect cable reel connector A (20P).

10. Connect cable reel connector A (20P) terminal No. 2 and body ground with a jumper wire.





* If the horns sound, replace the cable reel Service and Repair.
* If the horns do not sound, check these items.
- Horns.
- Horn relay.
- An open or high resistance in the wire.

* If OK, the MICU must be faulty. Replace the under-dash fuse/relay box Under-Dash Fuse/Relay Box Removal and Installation.
11. Remove the driver's airbag assembly Drivers Airbag Removal And Installation.

12. Check the installation of the driver's airbag assembly and the steering wheel. If the horn switch plate is OK, replace the driver's airbag assembly Drivers Airbag Removal And Installation.