Audio and Navigation System Failure Diagnostic Chart
| Signs | Reasons |
| The audio system does not turn on after pressing the power switch button | 1. Failure in the audio system power supply circuit. 2. Failure in the audio system. |
| The audio system night light does not work | 1. Failure in the audio system backlight circuit. 2. Failure in the audio system. |
| Speakers do not work in all modes | 1. Failure in the speaker circuit. 2. Failure in the audio system power supply circuit. 3. Failure in the audio system. |
| Ineffective volume control in all modes (volume too low) | 1. Failure in the speaker circuit. 2. Failure in the audio system power supply circuit. 3. Failure in the audio system. |
| Radio broadcasts are not being received (poor reception quality) | 1. Failure in the antenna circuit. 2. Failure in the audio system. |
| The CD or video CD will not insert or eject from the receiver after installation | 1. The disk is damaged. 2. Failure in the audio system power supply circuit. 3. Failure in the audio system. |
| The system power is on but the CD does not play | 1. The disk is damaged. 2. Failure in the audio system power supply circuit. 3. Failure in the audio system. |
| Unable to eject CD | 1. The disk is damaged. 2. Failure in the audio system power supply circuit. 3. Failure in the audio system. |
| Poor CD playback quality | 1. The disk is damaged. 2. Failure in the audio system. |
| Unstable CD playback | 1. The CD is damaged. 2. Incorrect installation of the audio system. |
| The touch switch does not work | 1. Failure in the audio system power supply circuit. 2. Failure in the audio system. 3. The cable bus is damaged. |
| The video screen does not fold back or open | 1. Failure in the audio system power supply circuit. 2. Failure in the audio system. |
| The navigation image is distorted | 1. Failure in the audio system. 2. The SD memory card is damaged. 3. GPS signal receiver failure. 4. The cable bus is damaged. |
| Navigation image vibrates, colors are distorted | 1. Failure in the audio system. 2. The SD memory card is damaged. 3. The GPS module is not installed correctly. 4. The cable bus is damaged. |