Inspection and verification
1. Check the validity of the customer's complaint by turning on the system.
2. Perform a visual inspection for obvious signs of mechanical or electrical damage.
Visual inspection diagram
|
Mechanical factors |
Electrical factors |
|
– Damage to the audio unit – Jamming, impossibility of loading the cassette player – Jamming, inability to load CD player – Antenna/adjustment |
– Fuse(s) – Electrical circuit(s) – Electrical connector(s) - Audio block - Speakers |
3. If an obvious cause for the fault you have identified or the fault described by the customer is found, correct the fault (if possible) before proceeding with further actions.
4. If the cause is not visually obvious, check the malfunction symptom and refer to Self-Diagnosis Mode.
Self-diagnostic mode
1. To enter the audio unit self-diagnosis mode, 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 Self-Diagnostic Mode.
3. To exit the Self-Diagnostic Mode, do not press any buttons on the audio unit for 10 seconds or press and hold the preset button 6 for more than 1 second.
4. If access to the Self-Diagnostic Mode is not possible, use a diagnostic tool to diagnose the audio unit.
|
Test |
Displayed syntax |
Electrical circuit being tested |
Name |
|
1. Checking the FM frequency band. |
There is reception on the FM frequency. |
Antenna signal. |
Tests the signal from the antenna cable. |
|
2. Announcement of the road information service. |
TP |
Volume level of traffic information service announcements. |
Allows you to adjust the volume. |
|
3. Checking the electrical circuit of the left front speaker. |
4CH LF for four-channel system, 2CH LF for two-channel system. |
Left front speaker electrical circuit. |
Check the speaker circuit. |
|
4. Checking the electrical circuit of the right front speaker. |
4CH RF for four-channel system, 2CH RF for two-channel system. |
Right front speaker electrical circuit. |
Check the speaker circuit. |
|
5. Checking the electrical circuit of the left rear speaker. |
4CH LR for four-channel system, 2CH LR for two-channel system. |
Left rear speaker electrical circuit. |
Check the speaker circuit. |
|
6. Checking the electrical circuit of the right rear speaker. |
4CH RR for four-channel system, 2CH RR for two-channel system. |
Right rear speaker electrical circuit. |
Check the speaker circuit. |
5. If the complaint is not resolved after passing the Self-Diagnostic Mode, refer to the Malfunction Symptom Table.
Table of signs of malfunction
|
State |
Possible Causes |
Action |
|
•: Audio unit not working - Works intermittently |
•Fuse(s). •Electric circuit. •Audio block. |
• Proceed to PINPOINT TEST H. |
|
•There is no indication on the display - the radio and cassette player are working |
•Audio block. |
•INSTALL the new audio unit. |
|
•Poor reception quality |
•Antenna. •Antenna cable. •Audio block. |
• Proceed to PINPOINT TEST I. |
|
•Poor quality/distorted sound in one or more speakers (not all speakers) |
•Speaker(s). •Electrical circuit(s). •Audio block. |
• Proceed to PINPOINT TEST J. |
|
•No sound from all speakers |
•Speaker(s). •Electrical circuit(s). •Audio block. |
• Proceed to PINPOINT TEST K. |
|
•CD player is not working properly |
•Audio block. |
•INSTALL the new audio unit. |
|
•No sound from one or more speakers (not all speakers) |
•Electrical circuit(s). •Audio block. |
• Proceed to PINPOINT TEST L. |