No PCI Messages From CD Changer

Test 1 - 2:

Test 3 - 6:

SYMPTOM
NO PCI MESSAGES FROM CD CHANGER

WHEN MONITORED
With the ignition on and the radio on.

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

POSSIBLE CAUSES
- Attempt to communicate with the radio
- CD changer (DIN) cable
- CD changer PCI bus circuit open
- Ignition switch output circuit open
- Radio ground circuit open
- CD changer