GMC AUX-GM4X Instruction Manual

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AUX-GM4X
QUICK START INSTALLATION GUIDE FOR SELECT 2006-14 GM LAN RADIOS WITH XM MODULE
Created August 11, 2017
Revised August 25, 2022

PRODUCT SAFETY & DISCLAIMER
READ ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING, FAILURE TO DO SO MAY CAUSE
PERSONAL INJURY OR DAMAGE TO PRODUCT AND/OR PROPERTY
This installation guide is provided as a GENERAL installation guide, some vehicles vary and
may require additional steps. We do not accept responsibility for third party labor charges
or modifications. Exercise due-diligence when installing this product.
We do not accept any responsibility for vehicle damage or personal injury resulting from
the installation of this product.
Careless installation and operation can result in equipment damage.
Requirements:
XM Tuner module with or without subscription
Introduction
Thousands of GM Cars, Trucks and SUV’s radio may include an AUX jack on
faceplate; however, over time the jack has a tendency to break. So, what do you
do when this happens? Many opt to repair, purchase a replacement radio or
ignore it. We decided to offer the AUX-GM4X. This harness connects to the XM
port on the radio and is independent of radio faceplate jack. Consider the AUX-
GM4 if a 2nd aux input is required.
Be mindful:
1. For the AUX-GM4X to work, vehicle MUST have an XM tuner module (with or
without subscription).
2. XM Tuner module is a metal box (See Fig. 1) installed in a remote area of
vehicle. (It is not built-into the AM/FM radio in the dash)
Warning: XM tuner module is NOT built into the AM/FM radio, but a separate box
in remote area. (See Fig. 1) To verify vehicle has XM Tuner, press “BAND” button
until XM1/XM2 is displayed. If only AM/FM is displayed; vehicle does not have
required XM Tuner installed. On Navigation radios if XM1/XM2 is “grayed out”
vehicle does NOT have required XM Tuner installed.
Fig. 1
See Frequently Asked question at the end of this guide for more details.
Installation
Radio must be removed from dashboard to gain access to connectors.
Vehicle specific removal instructions are not part of this guide but available
upon request. With radio removed:
1. Disconnect 16-pin XM plug (See Fig. 2) from radio
Note: Radios may have multiple 16-pin connectors which are “keyed”
to avoid making the wrong connection. (See Fig. 3)
Fig. 2

Fig. 3
2. Connect XM 16-pin plug to 16-pin connector on harness (See Fig. 4)
3. Connect harness 16-pin plug (See Fig. 2) to radio 16-pin socket vacated in
step 1 (See Fig. 3)
Fig. 4
16-pin connector
4. Carefully route audio jack (See Fig. 5) to a location on dash or nearby panel
where it will be mounted. (Cable is 4 ft.)
Mounting location will vary based on vehicle and customer’s preference.
Audio jack (active XM)
Audio jack (expired XM)
Fig. 5
Audio Jack
5. Optional: Drill a ¼” hole in dash or panel, push threaded end through hole
and secure with nut (See Fig. 6)
Fig. 6
Warning: Jack may be left freestanding, but to be mounted, ensure
panel is no thicker than 1/8” otherwise shaft may not protrude enough
to engage with nut. If necessary, use dremel, sander etc. to thin panel,

Operation
1. Turn radio “ON”
2. Press “BAND” or “XM” button until XM1 or XM2 is displayed
3. Connect audio device to 3.5mm jack using included 3 ft. audio cable or
similar (See Fig. 7)
4. Put audio device in play mode and enjoy.
Fig. 7
Male-male audio cable
5. Use radio volume control button to set playback level. If distortion is heard
lower volume on audio device.
Warning: Playlist and Track selection is *NOT* possible from the Radio.
You must use the audio devices built-in controls to access audio files .
6. To listen to XM simply disconnect 3.5mm audio plug from jack and operate
XM as customary
7. If correct operation is confirmed go ahead and reinstall Panels surrounding
the XM tuner.
Alert: When listening to XM audio jack must be empty (no connection)
otherwise unwanted noises will be present.
Frequent ask questions & troubleshooting
1. Does the AUX-GM4X work on all LAN radios?
YES; so long vehicle has an XM module. (See Fig. 1)
2. Does this cable work if vehicle does not have XM Tuner?
NO. XM Tuner required for this cable to work as described
3. The aux jack on my radio is broken. Will the AUX-GM4X work?
The AUX-GM4X is independent of radio aux jack. If aux jack is broken, the
AUX-GM4 is a great alternative; however, your vehicle must have an XM
Tuner module with or without subscription. Subscription is retained (Select
subscribed at checkout)
4. What is the difference between subscribed and not subscribed?
If subscription has expired with no intentions to renew , purchase “Not
subscribed”, otherwise purchase “Subscribed”
Important: Not subscribed cable does not allow XM playback at any time,
therefore to retain XM playback (now or in the future), purchase
“Subscribed” version.
5. I don’t know if vehicle has required XM module. How can I find out
without ripping the car apart?
Turn radio “ON”, press “BAND” or “XM” button repeatedly to cycle through
AM/FM/XM1/XM2. If only AM/FM is displayed, vehicle does not have an
XM Tuner and is not compatible with this part.
6. Does this cable also work if nothing’s wrong with radio aux jack?
YES,this cable works regardless of aux jack status. With the AUX-GM4X and
radio “AUX” it is possible to have two auxiliary inputs working independent
of each other. Vehicle must have XM Tuner module (with or without
subscription) for the AUX-GM4X to work.
*Warning: Not applicable to 2007 Silverado Classic. These requires our AUX-GM3 or AUX-
GM3x
For help please email [e-mail]
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