Audio System Symptom Troubleshooting - No sound

No sound NOTE: Set the fader and balance positions to the center. Check to see if there is a specific speaker that has no sound. Is there a specific one?
YES | - | Go to Step 2 .
NO | - | Go to Step 5 .
Check the speaker that has no sound for any damage. Is there any damage?
YES | - | Substitute the speaker and recheck.■
NO | - | Go to Step 3 .
Disconnect and check the speaker 2P connector for loose or a poor connection. Reconnect the speaker 2P connector and recheck the symptom; does it still appear?
YES | - | Go to Step 4 .
NO | - | Operation is normal.■
Remove the audio-HVAC display module. Check for continuity between the speaker terminal and audio unit terminals. Is there continuity?
YES | - | Go to Step 6 .
NO | - | An open circuit or poor wire connection between the speaker and audio unit.■
Disconnect the audio unit connector A (20P). Reconnect the speakers and measure the speaker resistance at the following terminals in the audio unit connector A (20P): Driver's: No. 8 (+) and No. 18 (−) terminals Front passenger's: No. 7 (+) and No. 17 (−) terminals Left rear: No. 6 (+) and No. 16 (−) terminals Right rear: No. 5 (+) and No. 15 (−) terminals Is there about 4 Ω?
YES | - | Go to Step 8 .
NO | - | An open circuit or poor wire connection between the speakers and audio unit.■
Check for continuity of the terminals below on the audio unit connector A (20P). Driver's: No. 20 (ground) and No. 8 (+), No. 20 (ground) and No. 18 (−) terminals Front passenger's: No. 20 (ground) and No. 7 (+), No. 20 (ground) and No. 17 (−) terminals Left rear: No. 20 (ground) and No. 6 (+). No. 20 (ground) and No. 16 (−) terminals Right rear: No. 20 (ground) and No. 5 (+). No. 20 (ground) and No. 15 (−) terminals Is there continuity?
YES | - | Faulty wire harness between the speaker and the audio unit.■
NO | - | Faulty audio unit.■