Test Description
The number below refers to the step number on the diagnostic table.
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 | |
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 |
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 |
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 . 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 . 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 . 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 . 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 . Did you complete the repair? | Go to Step 15 | -- |
13 | Replace the BCM. Refer to Control Module References 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 |
