Radio Replacement Interface
for select General Motors Vehicles
with Class II Data-Bus
GM1A-R
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Pacific Accessory Corporation
Rev: V7
Date: 072418
Page 1
The GM1A-R 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 warning chimes and the factory Bose amplier when the original radio is
removed. The GM1A-R provides data-bus driven outputs such as retained accessory power (RAP), vehicle speed signal (VSS),
illumination, reverse trigger and parking brake. The GM1A-R also provides an SWI Direct output for adding an optional PAC
Steering Wheel Control (SWC) retention interface (SWI-RC or SWI-CP2). Rear Seat Controls (RSC) if equipped will also be
retained with the SWI interface.
Module Layout
Important Notes
Introduction and Features
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. The Programming Button and Adjustment Dial on the side of the interface have multiple functions. Please see Page 2 for
more details.
1. Wire your aftermarket radio to the GM1A-R’s harness according to the wiring
connections chart. In vehicles without a Bose system: Cut the resistor packs
wrapped in heat shrink off and connect the aftermarket radio’s speaker outputs
to the remaining wires according to the wiring connections chart. Vehicles with
a Bose system: Wire the GM1A-R harness up as-is, with the resistor packs in
the harness.
2. Plug Interface Connectors 1 and 2 into the appropriate port on the GM1A-R
interface (using the illustrations above or the label on the bottom of the interface).
3. If you are also installing an optional SWC interface with the GM1A-R, connect the
SWI Direct Connector to the SWC interface. (Please refer to the SWC interface
instructions for conguration and programming instructions).
4. Remove the factory radio and plug in the GM1A-R’s vehicle harness into the
factory vehicle harness.
5. If necessary, program the SWC interface. Please see next section for more
details.
Installation Steps
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 (+)
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
Wiring Connections
Interface Connector 1
Interface Connector 2
Vehicle Connector
USB Port
Interface
Connector 2
Interface
Connector 1
Programming
Button
LED 2
LED 1
Adjustment Dial
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