Inspection and verification
1. Check the validity of the customer's complaint by turning on the system.
2. Perform a visual check for obvious signs of mechanical or electrical damage.
Visual Inspection Scheme
|
Mechanical factors |
Electrical Factors |
|
– Damage to the audio unit – Jamming, inability to refuel the cassette player – Jamming, inability to refuel the CD player – Antenna/adjustment |
- Fuse (And) - Electrical circuit (And) – Electrical connector (s) – Audio unit – Speakers |
3. If an obvious cause of a problem you identified or described by the customer is found, correct the problem before proceeding to further action (if possible).
4. If the cause is not visually obvious, check the symptom and refer to the Self-Diagnostic Mode.
Self-diagnosis mode
1. In order to enter the Self-diagnostic mode of the audio unit, you need to turn on the audio unit (ON position). Simultaneously press and hold preset buttons 5 and 6 for 2 seconds.
2. Release preset buttons 5 and 6; the audio unit will enter the Self-diagnostic mode.
3. To exit the Self Test Mode, do not press any of the buttons on the audio unit for 10 seconds, or press and hold preset button 6 for more than 1 second.
4. If the Self Test Mode cannot be accessed, use a diagnostic tool to diagnose the audio unit.
|
Test |
Syntax to display |
Tested electrical circuit |
Name |
|
1. Checking the FM band. |
There is FM reception. |
antenna signal. |
Tests the signal from the antenna cable. |
|
2. Announcement of the traffic information service. |
TP |
Traffic announcement volume level. |
Allows you to adjust the volume. |
|
3. Checking the electrical circuit of the left front speaker. |
4CH LF for 4-channel system, 2CH LF for 2-channel system. |
Left front speaker circuit. |
Check speaker circuit. |
|
4. Checking the electrical circuit of the right front speaker. |
4CH RF for 4-channel system, 2CH RF for 2-channel system. |
Right front speaker circuit. |
Check speaker circuit. |
|
5. Checking the electrical circuit of the left rear speaker. |
4CH LR for 4-channel system, 2CH LR for 2-channel system. |
Left rear speaker circuit. |
Check speaker circuit. |
|
6. Checking the electrical circuit of the right rear speaker. |
4CH RR for 4-channel system, 2CH RR for 2-channel system. |
Right rear speaker circuit. |
Check speaker circuit. |
5. If the complaint persists after going through the Self-Diagnostic Mode, refer to the Symptom Table.
Symptom table
|
State |
Possible Causes |
Action |
|
•: Audio unit not working - Malfunctioning |
•Fuse (And). •Electrical circuit. •Audioblock. |
• Go to PINPOINT TEST H. |
|
• There is no indication on the display - radio and cassette player are working |
•Audioblock. |
• INSTALL a new audio unit. |
|
•Poor reception quality |
•Antenna. •Antenna cable. •Audioblock. |
• Go to PINPOINT TEST I. |
|
• Poor sound quality/distortion in one or more speakers (not all speakers) |
• Speaker (And). •Electrical circuit (And). •Audioblock. |
• Go to PINPOINT TEST J. |
|
• No sound from all speakers |
• Speaker (And). •Electrical circuit (And). •Audioblock. |
• Go to PINPOINT TEST K. |
|
•CD player malfunctions |
•Audioblock. |
• INSTALL a new audio unit. |
|
• No sound from one or more speakers (not all speakers) |
•Electrical circuit (And). •Audioblock. |
• Go to PINPOINT TEST L. |
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