No Communication With CD/DVD Changer

Test 1:

Test 2 - 4:

SYMPTOM
NO COMMUNICATION WITH CD/DVD CHANGER

WHEN MONITORED
With the ignition on.

SET CONDITION
Anytime the module detects a communication problem with the CD changer.

POSSIBLE CAUSES
- CD changer wiring harness
- CD changer PCI BUS circuit open
- Ignition switch output circuit open
- Radio ground CKT open
- CD changer