PAC GM1A-RS Manual Download Page 2

GM1A-RS

Radio Replacement Interface with

Steering Wheel Control Retention

for select General Motors Vehicles

with Class II Data-Bus

 © 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.

PAC-audio.com

Pacific Accessory Corporation

Rev: V8

Date: 080118

Page 2

Interface Connector 1 Interface Connector 2 Interface Connector 3

Vehicle Connector 1

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 amplifier at all, 

or if you are connecting an aftermarket amplifier 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).

Installation Steps (cont.)

Yellow

12v+

Red

Accessory Output

(10 amp)

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 

Output (VSS)

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

Line Output 

Converter (LOC-1)

Chime Speaker

Wiring Connections

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.

Amplified

Non-Amplified

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.

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 only)

YES

NO 

GAIN ONLY

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

AVAILABLE ON PC APP

AVAILABLE ON MODULE

SETTING

Adjustable Settings

Related Downloads

     • RadioPRO PC App -  http://aampglobal.com/RadioProApp  

     • Latest instruction manuals - search part number on pac-audio.com, and look on “Downloads” tab

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