Pacic Accessory Corporation - Santa Ana, CA 92705
techsupport@pac-audio.com • Voice: 866-931-8021 • Fax: 714-835-3233 • www.pac-audio.com
03-27-10
NU-GM3
GM LAN 29bit
Navigation Unlock 
Integration Interface for 
Vehicles with 44-Pin Connector
Installation: Disconnect the black 44-pin main harness from the back of 
the radio (see g. A) Plug the male connector on the NU-GM3 harness into the 
44-pin port on the back of the radio. Connect the factory 44-pin harness into 
the female connector on the NU-GM3 harness.Plug the Black micro-t 24-pin 
connector on the NU-GM3 harness into the NU-GM3.
Locate the vehicles VSS wire in pin 20 of the gray 20-pin plug on the back of 
the radio (see g. A & B). PLEASE NOTE: The color of the wire in pin 20 
will dier depending on the vehicle you are working on. This wire will need 
to be cut then connected as follows: The green/black wire from the NU-GM3 
should be connected to the radio/plug side of the VSS wire and the green/white 
wire from the NU-GM3 should be connected to the vehicle side of the VSS 
wire.
If you wish to enable the reverse camera unlock feature you must power up 
the factory reverse camera. To do this a wire must be ran from the NU-GM3’s 
red camera turn on wire to the factory power wire for the reverse camera. The 
location of this wire will vary depending upon which vehicle you are installing 
the NU-GM3 into. Please see the next page for the different locations.
Please Note: If the customer does not wish to use the Reverse Camera unlock 
feature you do not have to locate and connect this wire. However if the lock 
button is pressed when the NU-GM3 is active the screen will switch to reverse 
camera mode.
The NU-GM3 is a Navigation Unlock integration interface that allows the factory navigation features of 
your GM radio or the reverse camera to be used by the passenger at anytime.