Circuit/System Description
WARNING: This page is about a different car, the 2008 Cadillac XLR. However, it is still accessible from the selected car via links, so may be relevant.
The CD changer is supplied with battery voltage from the RADIO, S-BAND/VCIS fuse located in the body control module (BCM). The radio provides the CD changer with right and left low level audio signal circuits (+) and (-). The audio signal circuits are DC bias voltage circuits that are one half of the battery voltage. When using a DMM, each of the audio signal circuits will measure approximately 6.5V DC. Ground for the CD changer id provided at G104.