No Sound From All Speakers

Test 1 - 4:

Test 5 - 8:

SYMPTOM
NO SOUND FROM ALL SPEAKERS

POSSIBLE CAUSES
- Radio error (DTC present)
- Fused IGN RUN/ACCY CKT open
- Radio ground CKT open
- Radio - speaker output
- Amplifier - fused B(+) CKT open
- Amplifier ground circuit open
- Enable signal to amplifier open
- Radio - amplifier enable circuit