| STEP | OPERATIONS TO BE CARRIED OUT | TEST RESULTS |
|---|
| 1 | COMPONENT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the condition of the fuse in the engine compartment junction unit. (Wiring Diagram ) E3010 HORNS | Move on to Step | Fuse faulty | Replace the protective fuse (Wiring Diagram ) E3010 HORNS |
| 2 | ELECTRICAL SYSTEM CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check for the output positive from the engine compartment junction unit to the steering column switch unit (Wiring Diagram ) E3010 HORNS | Move on to Step | No positive | Move on to Step |
| 3 | COMPONENT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the internal continuity of the engine compartment junction unit between: - protective fuse and horn relay feed
- relay feed and output to steering column switch unit
- relay feed and output to horns.
Check the condition of the relay feed (Wiring Diagram ) E3010 HORNS | Move on to Step | 1. Connections inside junction unit broken | 1. Replace the engine compartment junction unit See in Op. 5505A13 Additional junction unit in engine compartment - R.R. |
| 2. Relay feed faulty | 2. Replace the relay feed (Wiring Diagram ) E3010 HORNS |
| 4 | ELECTRICAL SYSTEM CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the output earth for the horn from the engine compartment junction unit to the steering column switch unit by pressing the horn contact. (Wiring Diagram ) E3010 HORNS | Move on to Step | No earth | Move on to Step |
| 5 | ELECTRICAL SYSTEM CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| check the continuity between- engine compartment junction unit and input on steering column switch unit
- steering column switch unit and connection on steering wheel after the clock spring
- connection on steering wheel and output to earth from steering column switch unit
- output from steering column switch unit to centre dashboard earth
- horn contacts on steering wheel (Wiring Diagram ) E3010 HORNS
| Move on to Step | 1. No continuity between engine compartment junction unit. | 1. Restore the electrical connection (Wiring Diagram ) E3010 HORNS |
| 2. No continuity between steering wheel connection and steering column switch unit input/output | 2. Replace the steering column switch unit/clock spring assembly See in Op. 5550A12 complete stalk unit - r+r for versions with air bag |
| 3. No continuity between steering column switch unit and centre dashboard earth | 3. Restore the electrical connection (Wiring Diagram ) E3010 HORNS |
| 4. No continuity between horn contacts on steering wheel | 4. Replace the steering wheel See in Op. 4110A11 STEERING WHEEL - R.R. for replacement or checks for versions with AIR BAG |
| 6 | ELECTRICAL SYSTEM CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the continuity between: - engine compartment junction unit and horns
- horns and right front earth
| Move on to Step | Electrical connection faulty | Restore the electrical connection (Wiring Diagram ) E3010 HORNS |
| 7 | COMPONENT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| check the condition of the horns | Move on to Step | Horns faulty | Replace the horns. See in Op. 5550B30 Left or right HORN (one) - R.R. |
| 8 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the fault is no longer present | | | |