For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Horn Schematics
1 | Did you review the Horns Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Horns
2 | Verify that the horns do have a poor tone. Does the system operate normally? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3
3 |

1. Test the horn mounting hardware for adequate torque. The hardware should be tightened to 10 N·m (7 lb ft).
2. Inspect the horns for debris in the joint where the horns attach to the vehicle.

Did you find and correct the condition?

Go to Step 7

Go to Step 4

4 |

1. Disconnect the horn connector.
2. Connect a 15 amp fuse jumper wire between the positive battery terminal and the control terminal of the horn.
3. Connect another jumper wire between the negative battery terminal and the ground terminal of the horn.

Do the horns have a harsh tone or buzzing?

Go to Step 6

Go to Step 5

5 | Repair the high resistance in the horn control circuit or the horn ground circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 7 | --
6 | Replace the horns. Refer to Horn Replacement . Did you complete the replacement? | Go to Step 7 | --
7 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3