Note for those owners who do not have XM

These new PAL units will work without XM, but installation will be different for you.  There are three situations:

Case 1.  No XM receiver, but you have the XM harness in your car.  

You can check to see whether you have the XM harness by pulling back the carpet above the left rear wheel well on coupes and Z06s.  In a convertible, the XM receiver location is behind the waterfall between the seats.  If there is an XM harness it will have a 16 pin connector like this:

or

The top connector is made by Yazaki and is used in later C6s.  

The bottom connector is made by Delphi, used in the earlier C6s.

In this case, you will have the Yazaki or Delphi 16 pin connector shown above, but no XM receiver to connect to.  So I'll send you this installation harness:

This will be very simple to install, because all you will need to do is connect the left end this harness to the XM body harness connector (Yazaki or Delphi) and the right end to the PAL module.

Here are some photos of the XM harness in a 2005 C6 convertible:

(photos courtesy of forum member Granger Tam)

The photo above shows that not only does this convertible have the XM harness, it also has the optional 6 CD external changer. 

The changer harness has a female connector into which the male XM connector (Delphi in this case) plugs (shown on the right). 

The changer harness also has a male connector, shown on the left, to plug into the XM receiver (which is not installed).

This male connector can be used for the PAL installation with the adapter harness that I supply.

Whether or not you have the changer, if you have the male 16 pin connector, you can install a PAL.

Case 2.  No XM receiver and no XM harness in your car.  

If you do not have the XM harness, you will have to connect your PAL at the back of the radio.  In this case, I will send you an installation harness that looks like this:

The connector on the left plugs into the PAL module.  The two connectors on the bottom right plug into the back of the radio or Nav unit, after you unplug the two connectors already in the radio and then plug them into the two connectors at the top right.

You will NOT have to connect the black/yellow XM wire, which is a JOB.  

To get to the back of the radio or Nav unit, you will have to remove the center console.

Once the console is out, there are four 7mm screws that hold the radio in place.

Case 3.  You have the XM receiver but you don't use it or subscribe to XM.  

For this case, you can use either the harness shown above in Case 1 or the standard PAL harness:

The standard PAL harness will allow you to connect the XM receiver even though you don't use it.

If you want to remove the XM receiver from your car and mount the PAL module in that location, use the harness shown in Case 1 above.

I'm still researching this issue, but here is what I THINK is the situation for the various years of C6s:

For 2005, some models have an XM harness, whether or not the car came with XM.

For 2006-2007, XM was an option, and those models without XM May not have the XM cable.  It could be that only upper trim levels may have it, or certain radio options, but I don't know for sure.

For 2008 and later, XM was standard so all models will have XM and, of course, the XM cable.

If any of you can add answers to this "mystery" please email me and let me know so I can update the website.

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Frequently Asked Questions about the GM PAL (Personal Audio Link)