No Response From Radio

Test 1 - 2:

Test 3 - 6:

Test 7 - 10:

Test 11 - 12:

SYMPTOM
NO RESPONSE FROM RADIO

POSSIBLE CAUSES
- Bad Shorted fused ignition Run/ACCY section of radio
- Fuse #4 defective
- Radio NO response
- Fused IGN run/ACCY CKT open
- PCI Bus circuit open
- Fused IGN Run/ACCY short to GND
- Radio ground CKT open
- PCI section of radio