As was noted in a recent posting, factory wiring for rear speakers in the 2006 – newer GX DOES exist going from the radio to a connector located just behind the left rear seat back.
Here is the rest of the story:
The wires end in a white multi-wire connector affixed to the steel seat back support at this location, not accessible from the trunk.
It is necessary to remove the rear seat back and seat in order to access this connector to tap onto these wires to extend them for rear speaker installation. They end at this connector, whereas in other Civic models they continue to factory speakers.
Wire color breakdown to this connector, per the Honda Civic factory shop manual:
A11 Gray Left Speaker + [This one is yellow at the radio]
A2 Brown Left Speaker –
A16 Blue Right Speaker +
A8 Orange Right Speaker –
[NOTE: The seat removal process is best done by following the procedure as outlined in the 2006 – 2009 (2010) “Service Manual GX Supplement”, available through www.Helminc.com ] I would urge all GX owners to purchase this, as it goes into the specifics of the GX as differs from the other Civic models, covering such other items as engine, fuel system, maintenance, body, electrical, etc.
It would be helpful to all of us who support and utilize this great forum if members would post information that is as complete and accurate as possible. If you know it is for sure, then say so; otherwise if a best guess, then admit it. About a year ago I posted a query asking if any wiring existed and the response on this forum was NO. Even the dealer told me no wiring existed. Further postings told of members running new cabling from the radio to the rear of the car for installing rear speakers. When accessing the rear of the radio to connect such cabling, one would have noted there was EXISTING rear speaker wires already connected to the radio. HMMM no mention in the postings!
Here is the rest of the story:

The wires end in a white multi-wire connector affixed to the steel seat back support at this location, not accessible from the trunk.
It is necessary to remove the rear seat back and seat in order to access this connector to tap onto these wires to extend them for rear speaker installation. They end at this connector, whereas in other Civic models they continue to factory speakers.
Wire color breakdown to this connector, per the Honda Civic factory shop manual:
A11 Gray Left Speaker + [This one is yellow at the radio]
A2 Brown Left Speaker –
A16 Blue Right Speaker +
A8 Orange Right Speaker –
[NOTE: The seat removal process is best done by following the procedure as outlined in the 2006 – 2009 (2010) “Service Manual GX Supplement”, available through www.Helminc.com ] I would urge all GX owners to purchase this, as it goes into the specifics of the GX as differs from the other Civic models, covering such other items as engine, fuel system, maintenance, body, electrical, etc.
It would be helpful to all of us who support and utilize this great forum if members would post information that is as complete and accurate as possible. If you know it is for sure, then say so; otherwise if a best guess, then admit it. About a year ago I posted a query asking if any wiring existed and the response on this forum was NO. Even the dealer told me no wiring existed. Further postings told of members running new cabling from the radio to the rear of the car for installing rear speakers. When accessing the rear of the radio to connect such cabling, one would have noted there was EXISTING rear speaker wires already connected to the radio. HMMM no mention in the postings!

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