For 1990-2009 cars

### Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

1. Tests if ground is constantly being applied to the horn relay.

2. The horn relay control circuit includes the horn switch. The horn switch must be tested for a short to ground when testing the relay control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you review the Horns operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Horns
2 | Depress and release the horn switch. Are the horns on at all times? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3 | Disconnect the horn relay. Are the horns on at all times? | Go to Step 7 | Go to Step 4
4 | Connect a test lamp between the battery positive voltage circuit of the horn relay coil and the horn relay control circuit. Does the test lamp illuminate? | Go to Step 6 | Go to Step 5
5 | Inspect for poor connections at the horn relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8
6 | Repair the short to ground in the horn relay control circuit. (The horn relay control circuit includes the horn switch.) Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 9 | --
7 | Repair the short to voltage in the horn control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 9 | --
8 | Replace the horn relay. Did you complete the replacement? | Go to Step 9 | --
9 | Operate the horns. Do the horns operate properly? | System OK | Go to Step 1