PAC NU-GM4 Quick Start Manual

Class 2 Class 2
VPW VPW J1850 J1850
Arbitration Arbitration
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The NU-GM4 is a Navigation Unlock integration interface that allows the factory navigation features of
your 29-bit GM LAN radio or the reverse camera to be used by the passenger at anytime.

Installation:

Disconnect the black 44-pin main harness from the back of the radio (see fig. A) Plug the male connector on the NU-GM4
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-GM4 harness.Plug
the Black micro-fit 24-pin connector on the NU-GM4 harness into the NU-GM4.
Locate the vehicles VSS wire in pin 20 of the gray 20-pin plug on the back of the radio (see fig. A & B). This wire will need to be cut then
connected as follows: The green/black wire from the NU-GM4 should be connected to the radio/plug side of the VSS wire and the green/white
wire from the NU-GM4 should be connected to the vehicle side of the VSS wire.
Gray 20-pin Plug

Reverse Camera Wire Location Avalanche/Suburban/Tahoe/Yukon

1. You will need to locate the junction block underneath the driver dash to the
right of the kickpanel on the firewall (Fig A).
2. Remove the cover and locate the 8 pin gray plug in the top left corner of the
junction block (Fig B).
3. The reverse camera wire is the blue wire in pin 2 (Fig C)
4. Connect the red camera turn on wire from the NU-GM4 to this blue wire.
5. Verify that the reverse lights do not come on when the reverse camera
unlock feature is being used.
11-15-11
techsupport@pac-audio.com • Voice: 866-931-8021 • Fax: 714-835-3233 • www.pac-audio.com
J1850 J1850
EOD EOD CRC CRC
Class 2 Class 2
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Main 44-pin Plug
Fig B
Pacific Accessory Corporation - Santa Ana, CA 92705
GM LAN 29-bit Navigation Unlock
InterfaceFor Select 2012 + Vehicles
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Installation
NU-GM4
Class 2 Class 2 J1850 J1850
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Fig A
Fig C
Class 2 Class 2
Pin 20
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