RP3-GM12
Radio Replacement Interface for General Motors Vehicles
Pacifi c Accessory Corporation® | Santa Ana, California 92705 | Ph. 866-931-8021 | support@pac-audio.com
©2013 Pacifi c Accessory Corporation
www.pac-audio.com
Rev. 11-22-13
Introduction & Features
Wiring Connection Chart
Illustration / Schematic
The RP3-GM12 interface allows the replacement of a factory radio in select General Motors vehicles with Class II radios. Using
this interface will retain factory features such as Warning Chimes when the original radio is removed. The RP3-GM12 provides
data bus driven outputs such as retained accessory power (RAP), vehicle speed sensor (VSS), illumination, reverse trigger and
parking brake. The RP3-GM12 also provides a secondary output for adding an optional PAC Steering Wheel Control (SWC)
retention interface (SWI-RC, SWI-PS, SWI-JACK, SWI-ECL2 or SWI-X).
Red / White Parking Brake
Output (-)*
Purple / White Vehicle Speed
Output*
Blue / White Amp Turn On Input
Red Accessory Output
(10 amp)
Orange / White Illumination Output
(+)*
Green Reverse Output (+)*
Interface Connector
Yellow Battery +12v
Black Ground
Blue Antenna On Input
White Front L + input
White / Black Front L - input
Grey Front R + input
Grey / Black Front R - input
Green Rear L + input
Green / Black Rear L - input
Purple Rear R + input
Purple / Black Rear R - input
Vehicle Connector
*Not all radios will have these
connections. Please insulate
these wires when not used.
Important Notes
1. For BOSE systems, the recommended line level input is between 2-4 volts from the aftermarket radio.
2. To prevent over driven audio when installing into a vehicle with a BOSE system and the aftermarket radio does not have low
level outputs then an LOC (part # SOEM-4 or LP3-4) is recommended to match the input voltage.
3. Use the 4 position selector switch located on the side of the interface to select the best chime output for your specifi c installation.