Diagnostic tables provide a procedure that will help you locate the condition in a circuit that is causing a malfunction. All diagnostic procedures are symptom based, to assist you in locating the condition as fast as possible. Diagnostic tables should exist for all possible (realistic) symptoms and diagnostic trouble codes (DTCs).
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: Horns will not sound when horn button is pressed. | ||||
1 | Was the Diagnostic System Check performed? | -- | Go to Step 2 | Go to Horns System Check |
2 |
Do the horns sound? | -- | Go to Step 3 | Go to Step 6 |
3 | Connect a test lamp between the horn relay terminals 85 and ground. Does the test lamp light? | -- | Go to Step 4 | Go to Power Distribution |
4 |
Does the test lamp light? | -- | Go to Step 5 | Go to Step 11 |
5 | Replace the horn relay. Is the repair completed? | -- | Go to Horns System Check | -- |
6 | Connect a test lamp between the underhood junction block terminal A12 or B12 (CKT 29) and ground. Does the test lamp light? | -- | Go to Step 8 | Go to Step 7 |
7 | Replace the underhood junction block, refer to underhood junction block replacement. Is repair completed? | -- | Go to Horns System Check | -- |
8 | Connect a test lamp between the Ground Splice Pack G104 (CKT 250) and battery (B+). Does the test lamp light? | -- | Go to Step 9 | Go to Step 10 |
9 | Replace horns. Is repair completed? | -- | Go to Horns System Check | -- |
10 | Inspect G104 ground, if OK replace Ground Splice Pack G104. Is repair completed? | -- | Go to Horns System Check | -- |
11 |
Does the test lamp light? | -- | Go to Step 7 | Go to Step 12 |
12 |
Does the test lamp light? | -- | Go to Step 13 | Go to Step 14 |
13 | Replace the Dash Integration Module (DIM), refer to DIM replacement. Is the repair completed? | -- | Go to Horns System Check | -- |
14 |
Does the test lamp light? | -- | Go to Step 15 | Go to Step 16 |
15 | Repair short to ground in CKT 28 (BLK). Is repair completed? | -- | Go to Horns System Check | -- |
16 | Repair open in CKT 28 in the steering column. Is the repair completed? | -- | Go to Horns System Check | -- |
