For 1990-2009 cars

One of the following conditions may cause the horn to sound constantly:

• | Sticking relay contacts in the relay

• | Sticking relay contacts in the horn pad

• | Wiring shorted to ground

Any of the above conditions cause burned (open) windings on most horns. Before you replace a horn with an open winding, ensure that none of the above conditions exist. If any of the above conditions exist, the horn windings will burn open again.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Disconnect the horn relay. Does the horn continue to sound? | -- | Go to Step 3 | Go to Step 2
2 | Connect a test lamp from the horn relay connector cavity 86 to B+. Does the test lamp light? | -- | Go to Step 4 | Go to Step 5
3 | Repair the short to voltage in the GRN wire between the horn relay and the horn. Is the repair complete? | -- | System OK | --
4 |

1. Disconnect the junction block connector C3.
2. Connect a test lamp from the horn relay connector cavity 86 to B+.

Does the test lamp light?

--

Go to Step 7

Go to Step 6

5 | Replace the horn relay. Is the repair complete? | -- | System OK | --
6 |

1. Disconnect the supplemental inflatable restraint SIR contact coil connector C3.
2. Connect a test lamp from the junction block connector C3 cavity 5 to B+.

Does the test lamp light?

--

Go to Step 9

Go to Step 8

7 | Replace the junction block. Is the repair complete? | -- | System OK | --
8 |

1. Disconnect the left side horn switch connector between the SIR contact coil and the left side horn switch.
2. Connect a test lamp from the left side horn switch connector BLU/BLK wire cavity to B+.

Does the test lamp light?

--

Go to Step 10

Go to Step 11

9 | Replace the SIR contact coil. Refer to SIR Contact Coil Replacement. Is the repair complete? | -- | System OK | --
10 | Inspect for a short to ground in BLU/BLK wires between the following components:

• | The left side horn switch

• | The right side horn switch

• | The SIR contact coil

If OK, replace the right horn switch.

Is the repair complete?

--

System OK

--

11 | Replace the left side horn switch. Is the repair complete? | -- | System OK | --