Certain year 9-5s came without the CD changer wiring harness installed by default (hence - no CDC connector in the trunk). The wiring harness was one of three components that was needed for an upgrade (CD changer installation).
Here's the information on VIN's that need that wiring harness. My MY01 didn't have it, so I ordered
from eEuroparts.com.
The installation is pretty simple:
1. Carefully take off the trunk upholstery on the left hand side. Make sure that you take it off all the way to the arch of the left passenger wheel.
2. On top of the left passenger wheel there are two connectors (seen in the pic above). Connect the CD changer wiring harness to them.
3. At this point you should be left with one small unmounted cable coming from the CD changer harness. That's the GND. Mount it to the body of the car. There are multiple places you can choose from.
4. Route the CD changer connector through an incision in the upholstery.
5. Refit the trunk upholstery.
2001 9-5 SE V6; 2006 9-5 Wagon; iOS; BlueSaab version = "latest and greatest" :)