Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
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 |
3 | Disconnect the body control module (BCM). Are the horns ON at all times? | Go to Step 4 | Go to Step 8 |
4 | Disconnect the horn relay. Are the horns ON at all times? | Go to Step 10 | Go to Step 5 |
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 7 | Go to Step 6 | |
6 | Inspect for poor connections at the horn relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | Go to Step 13 | Go to Step 12 |
7 | Repair the short to ground in the horn relay control circuit. Refer to Circuit Testing and Wiring Repairs. Did you complete the repair? | Go to Step 13 | -- |
8 | Test the horn switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
9 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | Go to Step 13 | Go to Step 11 |
10 | Repair the short to voltage in the horn fuse supply voltage circuit. Refer to Circuit Testing and Wiring Repairs. Did you complete the repair? | Go to Step 13 | -- |
11 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 13 | -- |
12 | Replace the horn relay. Did you complete the replacement? | Go to Step 13 | -- |
13 | Operate the horns. Do the horns operate properly? | System OK | Go to Step 1 |
