Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Tests if ground is constantly being applied to the horn relay.
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The horn relay control circuit includes the horn slip ring and the horn switch. The horn slip ring and the horn switch must be tested for a short to ground when testing the relay control circuit.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Horns Diagnostic System Check? | Go to Step 2 | |
2 | Is the vehicle equipped with keyless entry (AU0)? | Go to Step 3 | Go to Step 4 |
3 |
Is the horn on at all times? | Go to Step 4 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
4 |
Is the horn on at all times? | Go to Step 9 | 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 6 | Go to Step 7 | |
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Important: The horn switch is part of the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR. To disable the SIR system refer to Disabling the SIR System in SIR. Test the horn relay control 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 12 | Go to Step 8 | |
7 | 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 12 | Go to Step 10 |
8 | Inspect for poor connections at the body control module (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 12 | Go to Step 11 |
9 | 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 12 | -- |
10 | Replace the horn relay. Did you complete the replacement? | Go to Step 12 | -- |
11 |
Important: Perform the BCM programming procedure when replacing the BCM. Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 12 | -- |
12 | Operate the horn. Does the horn operate properly? | System OK | Go to Step 1 |
