RP3-GM13 - Car audio interface PAC - Free user manual and instructions

Product Type	Radio Replacement Interface
Compatible Vehicles	Select General Motors vehicles with Class II radios
Dimensions	Approx. 2.5 x 1.5 x 0.75 inches (estimated)
Weight	Approx. 0.2 lbs (estimated)
Power Supply	12V DC vehicle battery
Accessory Output Current	10 Amps max
Retained Accessory Power (RAP)	Retains radio power for 10 minutes or until driver door opens
Output Signals	Vehicle Speed Sensor (VSS), Illumination (+), Reverse (+), Parking Brake (-)
Steering Wheel Control (SWC) Support	Optional via SWI-RC, SWI-PS, SWI-JACK, SWI-ECL2, or SWI-X
Chime Volume Adjustment	4-position switch (1 loudest, 4 softest)
Firmware Update	Via PAC-UP interface updater (sold separately)
Wiring Harness	Includes vehicle and interface connectors with color-coded wires
Speaker Inputs	Front L/R, Rear L/R (high-level)
Antenna Input	Blue wire (Antenna On)
Installation Type	Plug-and-play with soldering or crimping
Operating Temperature	-20°C to 85°C (estimated)
Maintenance	No regular maintenance required; keep connectors clean
Safety	Ensure ignition off and driver door open before connecting
Spare Parts	Contact PAC Audio for replacement harness or interface
Repair	No user-serviceable parts; firmware updates available
Certifications	CE, FCC (estimated)
Warranty	1 year limited (estimated)

Frequently Asked Questions - RP3-GM13 PAC

What vehicles is the RP3-GM13 compatible with?

The RP3-GM13 is designed for select General Motors vehicles equipped with a Class II data bus. It allows replacement of the factory radio while retaining warning chimes and other features.

How do I adjust the chime volume?

Use the 4-position switch located on the side of the interface. Position 1 is loudest, position 4 is softest. Cycle through settings to find your preference.

Does the RP3-GM13 support steering wheel controls (SWC)?

Yes, it provides a dedicated SWC output connector for use with an optional PAC SWC interface such as SWI-RC, SWI-PS, SWI-JACK, SWI-ECL2, or SWI-X. The SWC interface must be programmed for Version 2.

What outputs does the interface provide?

The interface provides Retained Accessory Power (RAP), Vehicle Speed Sensor (VSS), illumination (+), reverse (+), and parking brake (-) outputs. Not all aftermarket radios use these signals.

How do I install the RP3-GM13?

First, ensure the ignition is off and the driver's door is open. Connect the vehicle harness to the interface, then connect the interface to the aftermarket radio using the provided wiring chart. Test all functions before finalizing installation.

Can the firmware be updated?

Yes, the RP3-GM13 can be updated with new firmware using the PAC-UP interface updater (sold separately). Check PAC Audio firmware page for available updates.

What is the purpose of the blue/white wire?

The blue/white wire on the interface connector is not used and should be insulated and taped off to prevent short circuits.

How does the Retained Accessory Power (RAP) work?

After turning off the ignition, RAP keeps the radio powered for 10 minutes or until the driver's door is opened, whichever comes first. The interface LED turns off when RAP deactivates.

My steering wheel buttons aren't working after installation. What should I do?

Ensure the SWC interface is programmed for Version 2. During button assignment, the vehicle should be running. Press and hold each button for at least 5 seconds while programming. Refer to your SWC interface manual for the correct sequence.

Can I use the RP3-GM13 without an aftermarket radio?

The interface is designed to work with aftermarket radios that accept standard speaker-level inputs and accessory/illumination signals. It is not intended for use with the factory radio.

USER MANUAL RP3-GM13 PAC

Introduction & Features

The RP3-GM13 interface allows the replacement of a factory radio in select General Motors vehicles with Class II radios. Using this interface will retain Warning Chimes when the original radio is removed. The RP3-GM13 provides data bus driven outputs such as retained accessory power (RAP), vehicle speed sensor (VSS), illumination, reverse trigger and parking brake. The RP3-GM13 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).

Important Notes

1. It is extremely important to makes sure the ignition is off and the drivers door open before connecting the interface to the vehicle.
2. Use the 4 position switch located on the side of the interface to select the best chime output volume for your specific installation. Setting 1 being loudest and 4 softest.

Wiring Connection Chart

Interface Connector

Red / White Parking Brake Output (-)*

Purple / White Vehicle Speed Output*

Blue / White Not Used

Red Accessory Output (10 amp)

Orange / White Illumination Output (+)*

Green Reverse Output (+)*

*Not all radios will have these connections. Please insulate these wires when not used.

Vehicle 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

Illustration / Schematic

Installation Steps

1. Make all connections as described in the chart on page 1.
2. Follow the instructions below if you wish to add an optional SWC retention interface.

Steering Wheel Control Output Connector

1. The RP3 provides a SWC output connector attached to the harness. For ease of installation, all necessary connections for an SWI have been made for you.
2. When using this SWC output connector the radio SWC interface MUST BE PROGRAMMED FOR VERSION 2. (refer to SWC interface programming instructions for exact programming sequence).
3. Both loops should remain in tact.
4. During steering wheel button assignment programming the vehicle should be running and each button should be pressed and held for at least 5 seconds. Please refer to the SWI manual for button assignment order.

Testing & Verification

1. Turn the ignition on. The LED on the interface will turn on & the +12v accessory wire will turn on.
2. Turn on the radio & check balance & fade.
3. If an optional SWC retention interface was used, verify that all SWC are functioning properly.
4. Turn off vehicle & remove key. RAP will be active & keep the radio on for 10 minutes or until the drivers door is opened.
5. The LED & radio will turn off when RAP turns off or the drivers door is opened.
6. Use the 4 position switch located on the side of the interface to select the best chime output volume for your specific installation. Setting 1 being loudest and 4 softest.

Product Updates (Firmware)

The RP3-GM13 can be updated with new firmware as it becomes available using the PAC-UP interface updater (sold separately). Please visit www.pac-audio.com/firmware for available updates.