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Radio Replacement Interface with
GM1A-RS
Steering Wheel Control Retention
for select General Motors Vehicles
with Class II Data-Bus
Introduction and Features
The GM1A-RS interface allows the replacement of a factory radio in select General Motors vehicles with the Class II Data-Bus.
Using this interface will retain factory features such as steering wheel controls (SWC), rear seat controls, warning chimes and the
factory Bose amplier when the original radio is removed. Use of this interface also allows you to program two radio functions to
each SWC button by using short press long press dual command functionality. The GM1A-RS provides data bus driven outputs
such as retained accessory power (RAP), vehicle speed signal (VSS), illumination, reverse trigger and parking brake. You can
also add multiple camera inputs to your aftermarket radio with Data-Bus controlled automatic activation (front camera only) by
connecting a VS41 into the expansion port on the GM1A-RS.
Important Notes
1. Does not retain OnStar.
2. Does not provide RSE audio to aftermarket radio.
3. Compatible in both Premium (Y91 / UQA) and Standard Bose systems.
4. Aftermarket radios with a 2-wire resistive based SWC circuit will not have default button assignments programmed. Please
refer to the owners manual of the radio you are installing to nd out the proper SWC programming procedure.
5. The included chime speaker should be used when: The vehicle has a standard Bose system (UQ7), the vehicle does not have
a factory amplier at all, or if you are connecting an aftermarket amplier to the cabin speakers.
6. The Programming Button and Adjustment Dial on the side of the interface have multiple functions. Please see Page 2 for
more details.
7. When used in conjunction with the add on camera controller (VS41) the GM1A-RS will only provide Data-Bus controlled
automatic activation for the front camera. Please refer to the vehicle specic VS41 instructions for more detail.
8. Fade is adjusted using the RadioPRO app, available at https://aampglobal.com/RadioProApp. The GM1A-RX module needs
to be connected to the vehicle, and the PC, to adjust chime volume.
9. In vehicles with Premium Bose (Y91 / UQA), dynamic fade is only supported by GM1A-RT and GM1A-RST.
Module Layout
Interface
Connector 1
Interface
Connector 2
Connector
Radio Select
DIP Switches
Adjustment Dial
Chime
LED 2
Programming
Button
LED 1
USB Port
Expansion
Port
Installation Steps
Set DIP switches that correspond with your radio to the ON position.
Set all other DIP switches to the OFF position.
Alpine JVC
1 2 1 & 2 3 2 & 3 1, 2, & 3 4 1 & 4
Other =
*Other - Dual / Axxera (these brands could also have 2-wire resistive), Jensen, Rockford Fosgate
Advent, BOYO, Dual, Lightning Audio, Rockford Fosgate, Visteon
Kenwood /
Lightning Audio
1. Set the Radio Select DIP switches according to the radio you are installing.
2. Wire your aftermarket radio to the GM1A-RS’s harness according to the wiring connections chart on the next page.
3. Plug Interface Connectors 1 and 2 into the appropriate port on the GM1A-RS interface (using the illustration above or the
label on the bottom of the interface).
4. Plug interface connector 3 into the LOC-1 module. Connection will be dependent upon whether or not the vehicle has a
factory amplied system. Plug this connector into the appropriate port on the included line output converter (Part # LOC-1;
using the illustration on the next page or the text stamped into the housing). Improper connection will result in either very
over-driven audio in amplied systems or very low audio in non-amplied systems. If this occurs, disconnect the harness from
the LOC-1 Module, and connect it into the port on the opposite side of the LOC-1.
Clarion /
Nakamichi
2-Wire
Resistive
Pioneer /
Other*
Sony Fusion
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Rev: V8
Date: 080118
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GM1A-RS
(
y)
Installation Steps (cont.)
5. Remove the factory radio and plug in the GM1A-RS’s vehicle harness into the factory
vehicle harness.
6. If you wish to reassign functions to the SWC, follow the programming instructions in
the next section.
7. If the vehicle has a standard Bose system, does not have a factory amplier at all,
or if you are connecting an aftermarket amplier to the cabin speakers, connect the
chime speaker to the chime connector on the interface and install the chime speaker
in a place free of obstructions where it can be easily heard (usually low in the dash
facing downward).
Interface Connector 1
Vehicle Connector 1
Interface Connector 2
Amplied
Line Output
Converter (LOC-1)
Interface Connector 3
Non-Amplied
Chime Speaker
Radio Replacement Interface with
Steering Wheel Control Retention
for select General Motors Vehicles
with Class II Data-Bus
Wiring Connections
Yellow 12v+
Red
Black Ground
Blue / White Remote On Input
Orange Not Used
Orange / White Illumination Output (+)
Purple / White Reverse Output (+)
Blue / Yellow SWC Output / Key 1
Brown SWC Output / Key 2
3.5 mm Jack SWC Output
Light Green Parking Brake Output (-)
Pink Vehicle Speed Signal
Purple Rear R + input
Purple / Black Rear R - input
Green Rear L + input
Green / Black Rear L - input
Gray Front R + input
Gray / Black Front R - input
White Front L + input
White / Black Front L - input
Accessory Output
(10 amp)
Output (VSS)
VS41 Wiring
The VS41 can be connected to the GM1A-RS and used to switch multiple cameras. Please refer to the document
labeled “Instructions for wiring the VS41 into 2003-2006 Chevy / GMC Trucks and SUVs” which can be found on
www.pac-audio.com under the VS41 product page.
Adjustable Settings
These products have settings that are adjustable through our RadioPRO PC app or through the push-button on the module.
Some settings are only adjustable through the PC app. Some of these settings require the module to be connected to the
vehicle. Below is a breakdown of these settings.
AVAILABLE ON PC APP
CONNECTED TO CAR NOT CONNECTED TO CAR
Chime volume (excluding Premium Bose Y91/UQA) YES NO YES
Factory amplifier settings:
Bass, Mid, Treble, Gain, and Fade
Premium Bose Y91/UQA onl
OnStar volume (RST or RT products only) YES NO YES
Read product version YES YES N/A
Update firmware YES YES N/A
Camera settings (VS41 required) YES YES NO
Related Downloads
• RadioPRO PC App - http://aampglobal.com/RadioProApp
• Latest instruction manuals - search part number on pac-audio.com, and look on “Downloads” tab
YES NO GAIN ONLY
AVAILABLE ON MODULESETTING
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Rev: V8
Date: 080118
Page 2
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Radio Replacement Interface with
Alpine JVC Kenwood Clarion Pioneer Sony Fusion
Volume +
Volume + Volume + Volume + Volume + Volume + Volume + Volume +
Volume -
Volume - Volume - Volume - Volume - Volume - Volume - Volume -
Seek Up
Track + Track + Track + Search + Track + Track + Track +
Seek Down
Track - Track - Track - Search - Track - Track - Track -
Preset
Preset Up
Preset/Disk
Down
Preset Mute Preset Up Preset Up Audio
Voice VR VR VR VR VR VR Mute
End
End Reject On Hook End End Answer / End Source
Volume +
Volume + Volume + Volume + Volume + Volume + Volume + Volume +
Volume -
Volume - Volume - Volume - Volume - Volume - Volume - Volume -
Source Up
Source Source Source Source Source Source Source
Source Down
Band Band Mute Band Band Band Off
Seek Up
Track + Track + Track + Search + Track + Track + Track +
Seek Down
Track - Track - Track - Search - Track - Track - Track -
Voice
OnStar OnStar OnStar OnStar OnStar OnStar OnStar
Prog
GM1A-RS
Steering Wheel Control Retention
for select General Motors Vehicles
with Class II Data-Bus
Programming Button and Adjustment Dial Functions
You can press and hold the programming button on the side of the interface to access different programming modes. Once the
LED is lit to the mode you desire (see below for modes), immediately release the programming button to access that mode.
PLEASE NOTE:
• This process must be done with the interface in the vehicle and the key in the ignition position.
• If there is a Premium Bose system (Y91 / UQA), and you are also installing an amplier on the cabin speakers,
make sure that the chime speaker is connected before proceeding. See the RadioPRO app section on Page 5 for
more details.
A. 1 Chime and LED 1 ash green: SWC re-assignment. This allows you to re-assign the SWC functions to the buttons
of your choice. Please see the Optional Steering Wheel Control Programming instructions on Page 4 for more details.
B. 2 Chimes and LED1 ash amber: SWC re-calibration (this mode is available in the Corvette only).This allows you
to re-calibrate the analog SWC in the event they fall out of the expected range and do not function properly. If data
control SWC are detected by the interface, this mode will be automatically skipped.
C. 3 Chimes and both LEDs ash green: Chime volume adjustment This allows you to adjust the volume of the
chimes generated by the interface using the adjustment dial on the side (this mode is not available in vehicles
equipped with Premium Bose (Y91 / UQA) amps). If a Premium Bose amp is detected by the interface, this mode will
be skipped as the factory amp is what generates the chimes. Please see the vehicles owner’s manual for adjustment of
chime volume in vehicles with Premium Bose (Y91 / UQA).
D. 4 Chimes and LED 1 ash red: Master reset. LED 1 will ash red and you will hear four chimes. This does a master
reset of the interface and restores the following settings to factory defaults:
• SWC Mapping
• SWC Calibration
• Camera Settings
• Infotainment Settings
• Interface User Options
Default Steering Wheel Control Programming
Default SWC Button Assignments
Alpine JVC Kenwood Clarion Pioneer Sony Fusion
Preset Up Preset - Preset Mute Preset + Preset + Audio
Default SWC Button Assignments (Corvette)
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Rev: V8
Date: 080118
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Radio Replacement Interface with
Alpine JVC
Kenwood /
Lightning Audio
Clarion /
Nakamichi
2-Wire
Resistive
Pioneer Other * Sony Fusion
1 Volume + Volume +
Volume +
Volume +
Volume + Volume + Volume + Volume +
2 Volume - Volume -
Volume -
Volume -
Volume - Volume - Volume - Volume -
3 Mute Mute
Mute
Mute
Mute Mute Mute Mute
4 Preset + Source
Source
Source
Preset + Preset + Preset + Source
5 Preset - Track +
Play
Search +
Preset - Preset - Preset - Track +
6 Source Track -
Track +
Search -
Source Source Source / End Call Track -
7 Track + Band / Disc +
Track -
Band
Track + Track + Track + Audio
8 Track - Preset / Disc -
Disc / FM +
Send / End
Track - Track - Track - Power
9 Power Select
Disc / AM -
Send
Band Band Band
10 Enter / Play Attenuation
Answer End
Phone Menu
Answer **
Power / End Call
11 Band / Program Phone Receive
Voice Dial
VR
Answer Call End ** Voice Dial / Answer / End Call
12 Receive Phone Reject
On Hook
End Call PTT **
VR (Android Auto & Car Play)
Answer / End Call***
13 End Voice Dial
Off Hook
VR
14 VR Power
Mute
15
Preset +
No specific
programming
order. Please
refer to the
owners manual
of your particular
radio for
programming
instructions..
* Advent, Boyo, Dual, Lightning Audio, Jensen, Rockford Fosgate & Visteon ** Jensen & Advent ONLY ***
XAV-AX100 Only
Please Note: On any entry with multiple commands, the commands shown are source dependent.
Button Programming Order
Volume Up
Volume Down
Seek Up
Seek Down
Preset
Answer / Voice
Hang Up
Preset Up
GM1A-RS
Steering Wheel Control Retention
for select General Motors Vehicles
with Class II Data-Bus
Optional Steering Wheel Control Programming
Programming
1. Turn the key to the ignition position.
2. Press and release programming button on the side of the interface.
3. Within 7 seconds, press the button that is to be learned on the steering wheel. LED 1 will turn red when the button is pressed.
At this point you have two options:
A. For short press functionality: Release the button within 1.5 seconds. LED 1 will turn back to green.
B. For long press functionality: Hold the button until LED 1 starts blinking. Release the button and the LED will
go back to green.
4. Repeat step 3 for each additional audio function on the steering wheel.
5. If you come across a function in the chart that your steering wheel does not have, or you do not want to program, press and
release the program button on the side of the interface to skip that function.
6. Once programming is completed, wait seven seconds. LED 1 will ash three times indicating end of programming.
7. Test the interface for proper functionality. Whenever a SWC is pressed LED 1 will illuminate green.
8. If any function does not work, repeat the programming steps.
Optional Programming Order
SWC Re-calibration Procedure (Corvette Only)
Please Note: This is only necessary if after installation, the SWC are acting erratic or
unresponsive in the Corvette.
1. Turn the key to the ignition position.
2. Press and hold the programming button until LED 1 turns amber and you hear two chimes.
When this happens, release the programming button.
3. Within 7 seconds, press and hold the button that is to be learned on the steering wheel. The
LED will turn off when the button is pressed and begin blinking when the value has been
learned. Once the LED begins blinking, release the button.
4. Repeat step 3 for each additional function on the steering wheel.
5. If you come to a button in the list that your vehicle does not have, skip it by pressing the
6. Once programming is completed, the LED will ash indicating end of programming.
7. Test the interface for proper functionality. Whenever a SWC is pressed LED 1 on the interface
programming button on the interface. Any buttons not learned during this process will not
function.
should blink green. If any function does not work, repeat the programming steps.
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Date: 080118
Rev: V8
Page 4
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Radio Replacement Interface with
GM1A-RS
Steering Wheel Control Retention
for select General Motors Vehicles
with Class II Data-Bus
Testing and Verication
1. Turn the ignition on. LED 1 will illuminate red and the +12v accessory wire will turn on.
2. Turn on the radio and check chimes, volume, and balance. Note: Premium Bose Systems (UQA / Y91) will not fade
from the aftermarket radio. If you want to adjust the fader you must use the RadioPRO app, available for download at
https://aampglobal.com/RadioProApp. Please see the RadioPRO app section, at the bottom of this page, for more details.
3. In vehicles equipped with Premium Bose (UQA / Y91): If the overall volume is too low, use the adjustment dial on the side of
the interface to set it to the desired level. The best way to do this is to turn the volume on the radio to 3/4 volume, then turn the
adjustment dial on the GM1A-RS clockwise until some distortion is heard, then counter-clockwise a little.
4. Verify that all SWC buttons are functioning properly. If you are installing the GM1A-RS into a Corvette, and are experiencing erratic
SWC behavior, you may need to follow the SWC re-calibration procedure in the next section.
5. Turn off vehicle and remove key. RAP will be active and keep the radio on for 10 minutes or until any door is opened.
6. LED 1 and the radio will turn off when RAP turns off.
Rear Seat Entertainment (RSE); If equipped
The factory RSE system will function independently from the aftermarket radio. The unit will power up and pass audio through the
headphones as long as the vehicle’s ignition is on. Audio from the RSE cannot be passed to the aftermarket radio when using the
GM1A-RS. If you wish to pass audio to the aftermarket radio you must use the GM1A-RT or GM1A-RST.
RadioPRO App
Download the RadioPRO PC App at https://aampglobal.com/RadiopProApp
Use of the RadioPRO App allows you to do the following:
• Congure User Interface Options such as:
• Factory amplier settings (Bass, Mid, Treble, Gain, Fader and Balance)*
• Chime Volume
• Camera Settings
• Update Product Firmware
• Read Firmware/Hardware Versions
*Available only in vehicles equipped with a Bose Smart Amplier
PLEASE NOTE:
The interface must be connected to the vehicle when using the following features of the RadioPRO App:
• Factory Amplier Settings
• Chime Volume
The interface does not need to be connected to the vehicle when using the following features of the RadioPRO App:
• Interface User Options
• Camera Settings
• Firmware Updates
• Reading rmware/hardware versions
Infotainment/Factory Amplier Adjustments
The RadioPRO app will also allow you to adjust the settings of the factory amplier (Y91 / UQA Premium systems only). You
can adjust Amp Gain, Fader, Balance, Bass, Mid and Treble. When real time fade is enabled in amplied systems, it will allow
fading to be controlled directly from the aftermarket radio. Restoring factory settings on the module will default all values back to
middle.
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Rev: V8
Date: 080118
Page 5
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Radio Replacement Interface with
GM1A-RS
Steering Wheel Control Retention
for select General Motors Vehicles
with Class II Data-Bus
Product Updates (Firmware)
Firmware Updates
The RadioPRO app will also allow you to update the interface with new rmware as it becomes available. The GM1A-RS can be
updated with new rmware as it becomes available. Please visit www.PAC-audio.com/rmware for available updates.
Connect the interface to your PC and select ”Firmware”, then “Update Firmware”. Now select “Select File”. Finally, browse to the
place where you saved the le and select it. This will begin the updating process. Once nished, disconnect the interface from
the PC and test operation.
Technical Support
Email: support@PAC-audio.com
Phone: 866-931-8021
International: 727-572-9255 ext 230
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Rev: V8
Date: 080118
Page 6
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