The following is the reply that I got from PAC about the change on the AAI-GM24 adapter!
The new AAI-GM24 is not fully plug and play, but very easy to wire up. The
reason why we didn't make it plug and play is because we had two harnesses
the 24 pin and the 12pin. Well, the reason for the 24 pin harness was just
for getting power and ground to the unit and it became to be a bunch of
wires to stuff behind the radio. So, we eliminated the 24 pin harness and
all you have to wire is the constant wire and the ground wire to the factory
harness. Plug the 12 pin harness into the radio and your done, not very
difficult.
Thank you,
Joe Riggs
Tech Support
PAC
1502 S. Santa Fe St.
Santa Ana, CA 92705
www.pac-audio.com
714-835-3022
800-854-3133