Installation of Neucleus Ipod adapter to 2004 CTS without XM module.
The attached picture (neucleus harness) is the harness that came with the Neucleus. The two square connectors are cut off, only the connector that connects to the neucleus is used .
The attached picture (new nucleus harness) is what is left after removal of the existing xm module connectors.
The only wires used are the orange, grey, white, white/black , black and yellow. The wires are as follows.
Yellow ------power +24vdc --------splices to wire on C3(grey) Pin #7
Grey ---------left + speaker -------goes to C3 (grey connector) Pin #1
White/Black---right + speaker--------goes to C3 (grey connector) Pin #3
White---------com speaker----------goes to C3 (grey connector) Pin #4
Black----------ground---------------splices to wire on C3 (grey) Pin #8
Orange --------Data----------------splices to wire on C1 Pin #8 or #11
The rest of the wires from the Neucleus harness are not used. Tape up good (stagger lengths so ends don’t mistakenly touch ( could cause problems if the neucleus uses these for other applications
You will need either a new connector to replace the grey connector, or the proper pins to insert into the required holes. Probably better off to use a new connector and make off all the connections required, as well as the #7 and #8 that are already being used.
I opted to keep the old connector and insert required pins that were required. Insulation was stripped off the wires from pin #7 and #8 and soldered the wires from the neucleus to them, and taped very well. The Data cable was spliced the same way. The attached picture (connected is a picture of the wires soldered and the wires connected to new pins and inserted into greay connector.
Sorry I tried to upload the word how to with pictures but it was too big and would not allow me to upload.
Once these were taped up the connector is connected into the Neucleus, cable for ipod connected and ran under middle console, the neucleus was placed behind the glove box, through the radio opening and the radio replaced.
Now take the vehicle to GM and have them enable the xm software in your radio ( there is a how to in the faq pages. The ipod charges, turns on and off when the key is in the ignition and started/shut off. The steering wheel buttons navigate through the ipod. The auxiliary function is turned on when the source button is pushed while in xm ( neucleus ipod) mode.
Please do this at your own risk, if you short or ground out any wires there could be serious repercussions
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Hope this Helps