GMC GM3x-HF Quick Start Installation Manual Download Page 8

Frequently asked questions 

1.

 

My vehicle has XM Tuner but no subscription. Will the GM3x-HF work 
without Subscription? 

Yes.  In addition, the XM/AUX input on module can be used to connect and 
play aux devices (Mp3 Players, iPod, DVD, iPad etc

.

  Auxiliary input option is 

not available

 to XM Subscribers.

 

2.

 

I’m not the original owner and don’t know if vehicle has XM Tuner. How 

can I find out without ripping it apart? 

Turn Radio “ON”. Press “BAND” button repeatedly to cycle through 

AM/FM/CD/XM1/XM2. If only AM/FM is displayed, your vehicle does not have 
the XM Tuner Module and therefore not compatible.

 

3.

 

Does the GM3x-HF work on all GM radios? 

Works on Navigation and non-Navigation GM Class-II radios with XM tuner 
module with or without subscription

 or with remote/external CD 

Changer. (Changer built-into radio is not external/remote) 

4.

 

Can I control Smartphone music from radio buttons? 
NO;

 

you 

must continue to use Phone built-in controls or the control 

button and/or voice commands to operate the device.

 Volume button on 

radio can be used to set playback level.  

5.

 

How to I reset the Module?

 

Press and hold control button for 5 seconds  

6.

 

How do I listen to XM or External/remote CD changer?

 

 Press the BAND, XM or CD/AUX button on radio to enter XM or CD Changer 
Mode (if not already) then press control 

button 4 times. These 

instructions also apply to Auxiliary option (instead of XM/CD Changer) 

 

7.

 

Where is the best place to install control button/mic?

 

We found that having the control button/mic mounted higher on the dash 
worked best, but users can experiment with different location and decide 
which works best for them. 

8.

 

Will the stereo mute when I receive or make a phone call? 

This system will not mute un

less radio is in “XM”

 

or “CD Changer”

 mode 

(Bluetooth mode). If in AM/FM mode, the radio will not mute and you must 
switch Bluetooth Mode.

 

9.

 

My second phone does not pair or find the Bluetooth Module? 

In order to pair a second phone make sure no other phones are connected. 
Once Bluetooth is turned off, module is free and ready for pairing.  

10.

 

Will I be able to use Module USB port to connect and play music from 
flash drives?

 

No. 

The USB port is for charging only.

 

11.

 

My radio has a built-in 6-CD Changer. Will this adapter work? 

As the name would imply, external or remote CD changer refers to changer 
mounted in a remote location in vehicle (e.g. armrest, glove box, trunk, 
hatch, under seat etc.) 

The changer built-into some GM Radios is 

internal and do not qualify as External or remote CD changer. 

 

 

 
 
 
 
 
 
 
 

 
Disclaimer 

• This product has no affiliation with GM 

 

• We’re not liable for misuse of this product.

 

•We recommend professional installation

 

emai

[email protected]

 

© 1995-Oct-19 Discount Car Stereo, Inc. All rights reserved. Information in this document is 
subject to change without notice. Other products and companies referred to herein are 
trademarks or registered trademarks of their respective companies or mark holders.

 

Summary of Contents for GM3x-HF

Page 1: ...reo com Driving without distraction is a necessity for a safer driving experience GM3x HF Quick start Installation Guide for GM Class II Vehicles with XM Tuner or Remote CD Changer Created July 19 201...

Page 2: ...ars Note XM subscription not required for operation however subscribers retain the service If not subscribed the module AUX input can be used to connect and play audio devices such as Mp3 players sate...

Page 3: ...one out Use included 3 5mm male to male cable See Fig 4a to connect your audio device to module XM AUX input jack Fig 4a 3 5mm male to male cable Fig 5 Module 7 Connect shorter 3 5mm plug from install...

Page 4: ...entilation duct is pointed towards the mic It is best to mount button facing driver USB Charging Port Options Should you decide to use it we suggest one of 3 connecting options A Flush to dash panel r...

Page 5: ...See Enabling the AUX section below B USB with Bracket Mount No drilling 1 Locate a flat surface at location of choice within 6 ft of radio to mount USB support bracket See Fig 14 using the adhesive b...

Page 6: ...drilling Secure module and proceed to section next section Bluetooth Pairing and Connection This process is required the first time you use the GM3x HF After initial pairing the GM3x HF will automatic...

Page 7: ...on twice Activate Voice Control Press hold button for 2 seconds Notes 1 If playback is distorted adjust volume on Bluetooth device 2 To reset Module press and Hold button for 5 seconds this will not u...

Page 8: ...n instead of XM CD Changer 7 Where is the best place to install control button mic We found that having the control button mic mounted higher on the dash worked best but users can experiment with diff...

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