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 |
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 |
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 |
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:
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 | -- |
