Audio System Troubleshooting; No Sound From Speakers - Honda GL1800 Service Manual

AUDIO SYSTEM
TROUBLESHOOTING
• Check the radio reception by tuning to a station known to have a strong signal.
• Check that the following fuses are good:
– No. 21 fuse (15 A)
– No. 22 fuse (20 A)
• Check that the multi-display indication function operates properly.

No sound from speakers

1. Audio Unit Connections Inspection
• Select the speaker with the "AUDIO" button when the audio system output is headset.
Remove the top shelter (page 2-12).
Check the audio unit 34P black and gray connectors for loose or poor contact.
Do all wires make good contact?
NO
YES
2. Audio Back-up Line Inspection
Check the audio back-up line (page 22-6).
Is battery voltage present?
NO
YES
3. Accessory Power Line Inspection
Check the accessory power line (page 22-6).
Is battery voltage present?
NO
YES
4. Audio Ground Line Inspection
Check the ground line (page 22-6).
Is there continuity?
NO
YES
5. Speaker Output Voltage Inspection
Measure the speaker output voltage (page 22-6).
Is voltage present?
NO
YES
22-4
– Correct the faulty part.
– GO TO STEP 2.
– Open circuit in the Red/yellow wire between the audio unit and fuse.
– GO TO STEP 3.
– Open circuit in the Light green/black wire between the audio unit and relay.
– GO TO STEP 4.
– Open circuit in the Green wire between the audio unit and ground terminal.
– GO TO STEP 5.
– • Open or short circuit in the wire between the audio unit and speaker.
• Faulty audio unit.
– Faulty speaker(s).