Test Description
The number(s) below refer to the step number(s) 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 inflatable restraint steering wheel module coil, the horn switch, and the horn slip ring. The horn switch is part of the inflatable restraint steering wheel module. The 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 and Inflatable Restraint Steering Wheel Module Replacement in SIR.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you review the system 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 |
| -- | 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 |
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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. Repair the short to ground in the horn relay control circuit. (The horn relay control circuit includes the horn switch and the inflatable restraint steering wheel module coil.) 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 |
