Test Description
WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The number below refers to the step number on the diagnostic table.
- 7: Tests if ground is constantly being applied to the horn relay.
Horns Always On
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Is the vehicle equipped with content theft deterrent (UA6)? | Go to Step 2 | Go to Step 3 |
| 2 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 4 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 3 | Did you review the Horns operation and perform the necessary inspections? | Go to Step 4 | Go to Symptoms - Horns |
| 4 | Depress and release the horn switch. Are the horns ON at all times? |
Go to Step 5 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
| 5 | Disconnect the body control module (BCM). Are the horns ON at all times? |
Go to Step 6 | Go to Step 10 |
| 6 | Disconnect the horn relay. Are the horns ON at all times? |
Go to Step 12 | Go to Step 7 |
| 7 | 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 9 | Go to Step 8 |
| 8 | 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 15 | Go to Step 14 |
| 9 | Repair the short to ground in the horn relay control circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you complete the repair? |
Go to Step 15 | - |
| 10 | Test the horn switch signal circuit for a short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 15 | Go to Step 11 |
| 11 | Inspect for poor connections at the harness connector of the BCM. 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 15 | Go to Step 13 |
| 12 | 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 15 | - |
| 13 | Replace the BCM. Refer to Control Module References
in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 15 | - |
| 14 | Replace the horn relay. Did you complete the replacement? |
Go to Step 15 | - |
| 15 | Operate the horns. Do the horns operate properly? |
System OK | Go to Step 1 |