No PCI Messages From CD Changer

Test 1:

Test 2 - 5:

SYMPTOM
NO PCI MESSAGES FROM CD CHANGER

WHEN MONITORED
With ignition ON, the Radio turned ON, and DRB connected to the data link connector.

SET CONDITION
If the DRB interrogates the CD changer and does not receive the proper response from the CD changer.

POSSIBLE CAUSES
- CD changer (DIN) cable
- CD changer PCI bus circuit open
- Fused IGN run/ACCY CKT open
- Radio ground CKT open
- Bad PCI section of CD changer