Introduction & Features
Important Notes
Wiring Connection Chart
Illustration / Schematic
The RP3-GM11 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 and BOSE® amplifi er (Standard or Premium) when the original 
radio is  removed.  The  RP3-GM11 provides  data  bus  driven  outputs  such  as  retained accessory  power (RAP), vehicle speed 
sensor (VSS), illumination, reverse trigger and parking brake. The RP3-GM11 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). Rear Seat
Controls (RSC) if equipped will also be retained with the SWI interface.
1. When used in Non-BOSE® applications simply cut off the RCA connectors and connect the remaining wires to the aftermarket 
radios high level speaker outputs.
2. For BOSE® systems, the recommended line level input is between 2-4 volts from the aftermarket radio. 
3. RSC buttons that are identical to the SWC will mimic the SWC one for one
4. To prevent over driven audio when installing the interface 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 or you can create 
an audio attenuation circuit (see diagram 2 below for audio attenuation wiring).
5. Use the 4 position selector switch located on the side of the interface to select the best chime output volume for your specifi c 
installation .
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