Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Horn Schematics | |||
1 | Did you review the Horn System Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Horns |
2 |
Is voltage present? | Go to Step 3 | Go to Step 4 |
3 | Using a test lamp, test for battery positive voltage at the coil side of the relay battery positive voltage circuit. Refer to Circuit Testing in Wiring Systems. Is voltage present? | Go to Step 5 | Go to Step 4 |
4 | Repair the open or short in the battery positive circuit. Refer to Circuit Testing in Wiring Systems. Did you find and correct the condition? | Go to Step 18 | -- |
5 |
Is ground present? | Go to Step 7 | Go to Step 6 |
6 |
Is ground present? | Go to Step 7 | Go to Step 12 |
7 |
Is voltage present? | Go to Step 9 | Go to Step 15 |
8 |
Important:: The horn switch circuit 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 SIR Disabling and Enabling in SIR. Repair the open in the horn switch signal circuit. Refer to Circuit Testing in Wiring Systems. Did you find and complete the repair? | Go to Step 18 | -- |
9 | With the horn connector still disconnected, test the ground circuit for ground. Refer to Circuit Testing in Wiring Systems. Is there ground present? | Go to Step 10 | Go to Step 11 |
10 | Replace the horn. Refer to Horn Replacement . Did you complete the replacement? | Go to Step 18 | -- |
11 | Repair the open in the horn ground circuit. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 18 | -- |
12 | Using a test lamp connected to battery positive voltage, test the horn switch ground circuit for ground. Refer to Circuit Testing in Wiring Systems. Is ground present? | Go to Step 13 | Go to Step 14 |
13 | Replace the horn switch. Did you complete the replacement? | Go to Step 18 | -- |
14 | Repair the open in the horn switch ground circuit. Refer to Wiring Repairs in Wiring Systems. Did you correct the condition? | Go to Step 18 | -- |
15 | With the horn switch depressed, test the horn feed circuit at the relay for battery positive voltage. Refer to Circuit Testing in Wiring Systems Is voltage present? | Go to Step 16 | Go to Step 17 |
16 | Repair the open in the horn supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 18 | -- |
17 | Replace the horn relay. Did you complete the replacement? | Go to Step 18 | -- |
18 | Operate the system in order to verify repair. Did you correct the condition? | System OK | Go to Step 2 |
