RP4-GM32
Radio Replacement & Steering Wheel Control Interface
for General Motors Vehicles
Pacic Accessory Corporation
® | Clearwater, Florida 33760 | Ph. 866-931-8021 | support@pac-audio.com
©2015 Pacic Accessory Corporation
www.pac-audio.com
Rev. 012115
Introduction & Features
Important Notes
Wiring Connection Chart
Illustration / Schematic
The RP4-GM32 interface allows the replacement of a factory radio in select General Motors vehicles with 29-bit LAN
radios. Using this interface will retain factory features such as steering wheel controls (SWC), Warning Chimes, Rear
Seat Controls (RSC) and the 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
RP4-GM32 also provides data bus driven outputs such as retained accessory power (RAP), vehicle speed sensor (VSS),
illumination, reverse trigger and parking brake.
1. The radio select rotary switch on the side of the interface must be adjusted to the proper radio setting before plugging the
interface into the vehicle (see below for setting chart).
2. The interface comes pre-programmed for all of the vehicles factory SWC functions and does not require programming unless
you wish to re-assign the SWC functions or utilize short press long press dual command functionality. The SWC can always be
restored to default settings by pressing and releasing the program button on the side of the interface once and waiting 7 seconds
for the LED to ash 4 times.
3. RSC buttons that are identical to the SWC will mimic the SWC one for one.
4. The LED will ash whenever a SWC button is pressed.
Red / White Parking Brake
Output (-)
Purple / White Vehicle Speed
Output
Blue / White Amp Turn On Input
Red Accessory Output
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 SWC Connector
