DIAGNOSIS AND TESTING - HORN SYSTEM
In most cases, any problem involving continually sounding horns can be quickly alleviated by removing the horn relay from the Junction Block (JB).
WARNING: Disable the airbag system before attempting any steering wheel, steering column, seat belt tensioner, side airbag, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take the proper precautions could result in accidental airbag deployment and possible personal injury.
| CONDITION |
POSSIBLE CAUSES |
CORRECTION |
| BOTH HORNS INOPERATIVE |
1. Faulty fuse. |
1. Check the fuse in the Junction Block (JB). Replace the fuse and repair the shorted circuit or component, if required. |
| 2. Faulty horn relay. |
2. Refer to horn relay for the proper diagnosis and testing procedures. Replace the horn relay or repair the open horn relay circuit, if required. |
|
| 3. Faulty horn switch. |
3. Refer to horn switch for the proper diagnosis and testing procedure. Replace the horn switch or repair the open horn switch circuit, if required. |
|
| 4. Faulty horns. |
4. Refer to horn for the proper diagnosis and testing procedure. Replace the horns or repair the open horn circuit, if required. |
|
| ONE HORN INOPERATIVE |
1. Faulty horn. |
1. Refer to horn for the proper diagnosis and testing procedures. Replace the horn or repair the open horn circuit, if required. |
| HORN SOUNDS CONTINUOUSLY |
1. Faulty horn relay. |
1. Refer to horn relay for the proper diagnosis and testing procedure. Replace the horn relay or repair the shorted horn relay control circuit, if required. |
| 2. Faulty horn switch. |
2. Refer to horn switch for the proper diagnosis and testing procedure. Replace the horn switch or repair the shorted horn switch circuit, if required. |