The first step in creating an action plan is to determine if you have connector C217. This is a black 4 cavity connector that allows for the connection of an audio input to the head unit from the XM receiver and/or 12 disc changer.
C217 is located under the dash just to the right of the steering column. To view the area where this may be located, the knee bolster must be removed. This is the panel that runs across the lower part of the dash just in front of where the drivers legs would be.
To remove the knee bolster, grasp the top portion (just underneath the steering column) and the lower edge. Pull sharply straight backwards toward the rear of the car. Below is a picture of what you will see once it'* off:
To expose the area where you should see the connector (if your car is equipped), you need to lift up on the trim piece attached to the bottom of the steering column right where it meets the dash. This is what you should see:
Towards the right you should see a yellow connector clipped to the dash. This is an airbag connector. Somewhere between this connector and the steering column you will hopefully find C217.
In the picture below, you will see mine. In my case, both halves are there. IF your car is equipped with one, you will only see the MALE half. It should also be clipped to the dash. There will be four wires attached that are:
A. Bare (with a clear insulating sleeve)
B. Black with a white stripe
C. Dark green with a white stripe
D. Brown with a white stripe.
You can't see those colours in the picture below, but you can see the connector. Again, your car (if equipped) will should only have the MALE half.
This connector, as I understand, MAY only be present on the 2003-05 Bonneville. This post does NOT apply to the 2000-02 model year vehicles.