Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Inspect the vehicle for the UA6 theft deterrent option. Is the vehicle equipped with the UA6 theft deterrent option? | -- | Go to Step 2 | Go to Step 3 |
2 | Did you perform the Body Control Module (BCM) Diagnostic system Check? | -- | Go to Step 3 | Go to Diagnostic System Check - Body Control System in Body Control System |
3 | Depress the horn switch. Does the horn operate? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | |
4 |
Does the test lamp illuminate? | -- | ||
5 |
Does the test lamp illuminate? | -- | ||
6 | Connect a test lamp between the battery positive voltage circuit of the horn relay switch and a good ground. Does the test lamp illuminate? | -- | ||
7 | Momentarily connect a 15 amp fused jumper between the battery positive voltage circuit of the horn relay switch and the horn control circuit. Does the horn operate? | -- | ||
8 |
Does the test lamp illuminate? | -- | ||
9 |
Does the test lamp illuminate? | -- | ||
10 | Inspect for poor connections at the horn. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
11 |
Does the horn operate? | -- | ||
12 | 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? | -- | ||
13 | Repair the high resistance in the horn control circuit or the horn ground circuit. (A resistance as low as 0.5ohms could cause operating problems with the horns.) Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
14 | Repair the open or high resistance in the battery positive voltage circuit of the horn relay coil. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
15 |
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 open or short to voltage in the horn relay control circuit. (The horn relay control circuit includes the horn switch and the horn slip ring.) Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
16 | Repair the open or high resistance in the battery positive voltage circuit of the horn relay switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
17 | Repair the open or high resistance in the horn control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
18 | Repair the open or high resistance in the horn ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
19 | Replace the horn relay. Refer to Horn Relay Replacement . Did you complete the repair? | -- | -- | |
20 | Replace the horn. Refer to Horn Replacement . Did you complete the repair? | -- | -- | |
21 | Operate the horn. Does the horn operate properly? | -- | System OK |
