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 Systems |
3 | Remove the horn relay. Do the horns stop sounding? | -- | Go to Step 4 | Go to Step 13 |
4 | Connect a test lamp between the horn relay terminals CKT 740 and CKT 28. Refer to Fuse Block Details in Electrical Diagnosis for terminal location. Does the test lamp illuminate? | -- | Go to Step 5 | Go to Step 7 |
5 |
Does the test lamp illuminate? | -- | Go to Step 6 | Go to Step 8 |
6 |
Does the test lamp illuminate? | -- | Go to Step 9 | Go to Step 10 |
7 | Replace the horn relay. Refer to Horn Relay Replacement for service procedure. Is the repair complete? | -- | -- | |
8 | Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Is the repair complete? | -- | -- | |
9 | Repair the short to ground in CKT 28 between the BCM and the accessory wiring junction block or between the accessory wiring junction block and C201. Is the repair complete? | -- | -- | |
10 |
Does the test lamp illuminate? | -- | Go to Step 11 | Go to Step 12 |
11 | Replace the horn switch. Refer to Horn Replacement for service procedure. Is the repair complete? | -- | -- | |
12 | Repair the short to ground in CKT 28 between the horn switch and C201. Is the repair complete? | -- | -- | |
13 | Disconnect the accessory wiring junction block connector C3. Do the horns stop sounding? | -- | Go to Step 14 | Go to Step 15 |
14 | Replace the accessory wiring junction block. Is the repair complete | -- | -- | |
15 | Repair the short to B+ CKT 29 between the horn connector and the accessory wiring junction block. Is the repair complete? | -- | -- |
