Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
|
Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open. | ||||
1 | Use a scan tool in order to perform the Body Control Module (BCM) Diagnostic System Check. Were any DTC's set? | -- | Go to Diagnostic Trouble Code (DTC) List/Type in Body Control System | Go to Step 2 |
2 |
Does the horn sound? | -- | Go to Step 3 | Go to Step 4 |
3 | Replace the faulty relay. Is the repair complete? | -- | -- | |
4 | Use a fused jumper in order to backprobe the underhood wiring harness junction block between terminal C12 of connector C3 and ground. Does the horn sound? | -- | Go to Step 6 | Go to Step 9 |
5 | Replace the underhood wiring harness junction block. Refer to Underhood Fuse Block Replacement in Engine Electrical. Is the repair complete? | -- | -- | |
6 | Use the J 39200 digital multimeter (DMM) in order to backprobe the turn/headlamp switch assembly between terminal A of connector C2 and ground. Does the voltage measure within the specified range? | B+ | Go to Step 8 | Go to Step 7 |
7 | Repair the open in CKT 28 between the underhood wiring harness junction block and the turn/headlamp switch assembly or the body control module (BCM) connector C1 terminal A4. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
8 | Repair the open in the horn switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column/Standard. Is the repair complete? | -- | -- | |
9 |
Does the test lamp light? | -- | Go to Step 10 | Go to Step 11 |
10 |
Does the test lamp light? | -- | Go to Step 13 | Go to Step 14 |
11 | Use a DMM in order to measure the resistance between the underhood wiring harness junction block connector C2 terminal C12 and the horn assembly connector terminal B. Is the measured resistance within the specified range? | 0-2 ohms | Go to Step 5 | Go to Step 12 |
12 | Repair the open in CKT 29 between the underhood wiring harness junction block and the horn assembly. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
13 | Replace the horn assembly. Refer to Horn Replacement . Is the repair complete? | -- | -- | |
14 | Repair the open in CKT 1350 between the horn assembly and ground splice pack G101. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
