| 1. | Insert the disk to see if the symptom can be duplicated. Is it duplicated? YES - Go to 2. NO - Operation is normal.n |
| 2. | Check the disc for contamination, scratches or other damages. Is there contamination or any damages? YES - Go to 4. NO - Go to 3. |
| 3. | Check the system that it occurs. Does the symptom only occur or rough roads? YES - Compare to a similar vehicle under the same conditions.n NO - Replace the audio unit.n |
| 4. | Try a known-good disc. Does the symptom rec? YES - Replace the audio unit.n NO - The disc is faulty.n |