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.
- Check for a blown No. B24 (10 A) fuse in the under-dash fuse/relay box. If it is blown, check for a faulty horn relay.

1. Turn the steering wheel 180 degrees from the center position and remove the cover (A).






2. Disconnect the horn switch 1P connector (B).

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

- If the horns does 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 Driver's Airbag Replacement.

6. Disconnect the cable reel subharness 20P connector (A) to the cable reel.






7. Check for continuity between the cable reel subharness 20P connector terminal No. 20 and horn switch 1P connector terminal No. 1.

- If there is continuity, go to step 8.
- If there is no continuity, repair an open in the wire or faulty cruise control combination switch.

8. Remove the steering column covers Steering Column Removal/Installation.

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






10. Connect the dashboard wire harness 20P connector terminal No. 10 and body ground with a jumper wire. The horns should sound.

- If the horns does not sound, check these items. If OK, faulty MICU.
- Horn.
- Horn relay, horn diode.
- An open or high resistance in the wire.

- If the horns sounds, replace the cable reel Service and Repair.

11. Remove the driver's airbag assembly Driver's Airbag Replacement.

12. 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.