No Response From Radio

Test 1 - 3:

Test 4 - 8:

SYMPTOM
NO RESPONSE RADIO

POSSIBLE CAUSES
- Ground strap/Antenna problem
- Open CCD bus (+) CKT- CCD radio
- Open CCD bus(-) CKT- CCD radio
- Open fused B(+) CKT radio
- Fused ignition switch output CKT- short/ground
- Open fused ignition switch output CKT- radio
- Radio- CCD bus (+) CKT
- Radio- fused ignition switch
- Radio- no response