RP5-GM61 Radio Replacement Interface

Introduction and Features

The RP5-GM61 interface allows the replacement of a factory radio in select General Motors vehicles equipped with 29-bit LAN v2, 20-pin, and 16-pin connector radios. This interface is designed to retain factory features such as BOSE, OnStar, vehicle settings, steering wheel controls (SWC), front and rear park assist, and warning chimes after the original radio is removed. Additionally, the RP5-GM61 provides data bus driven outputs including retained accessory power (RAP), vehicle speed (VSS), illumination, reverse trigger, and parking brake.

Important Notes

• For optimal installation time, make your vehicle settings selections before removing the factory radio. After the radio is removed, vehicle settings normally accessed through the factory radio can be managed by downloading and installing the PAC RadioPRO PC Application from www.pac-audio.com/firmware.
• Before removing the factory radio, review the following settings, as they will not be retained after removal: Ambient Lighting Control, OnStar Text, Teen Driver Feature, Performance Data Recorder, Valet Mode, Custom Launch Control (Line Lock, Launch Control), and Rear Park Assist Symbols displayed on the Reverse Camera Image.
• Upon first plugging in the module, it will undergo an initialization process lasting up to 12 seconds. Ensure the vehicle is running during this process.
• Adjust the radio select DIP switches on the interface to match your new radio's settings before connecting the interface to the vehicle. Refer to the setting chart on page 2.
• The Voice button can be configured via the RadioPRO PC Application to activate the factory OnStar function. By default, it controls the aftermarket radio's voice function.
• To retain OnStar functionality when using an aftermarket amplifier for mids & highs, an additional RPA-SPK Chime speaker must be purchased separately.
• The interface is pre-programmed for all factory SWC functions. Programming is only required if you wish to re-assign SWC functions, use buttons without initial programming, or utilize short press/long press dual commands. To restore default settings, press and release the program button once and wait 7 seconds for the LED to flash 4 times. Note: Chevrolet Malibu models may require SWC re-mapping, with default volume up/down and track up/down potentially reversed.
• Language settings in some vehicles are controlled via MOST. Adjust these settings accordingly before removing the radio, as they may not be accessible after installation.
• Refer to the vehicle's RPO CODE sticker, typically located in the glove box or under the spare tire cover, for specific vehicle information.

Module Layout

The RP5-GM61 module features the following components:

• Adjustment Dial
• Radio Select DIP switches
• Interface Connector 4
• Programming Button
• USB Port
• Interface Connector 1
• Expansion Port
• Interface Connector 2
• Non-Amplified Audio Output
• Amplified Audio Output
• LED 2
• LED 1

Installation Steps

Follow these steps for installation:

1. Set the Radio Select DIP switches according to the radio you are installing. Ensure switches corresponding to your radio brand are ON, and all others are OFF. If your brand is not listed, use the "ALL OTHER BRANDS" setting.
2. Wire your aftermarket radio to the RP5-GM61 harness according to the wiring connections chart on page 3.
3. If your aftermarket radio has a mute wire, cut the Brown mute loop in Interface Connector 4. Use the side of the loop next to the orange wire in pin 24 to connect to your aftermarket radio's mute wire.
4. Plug Interface Connectors 1 & 2 into their corresponding ports on the RP5-GM61 interface.
5. Interface Connector 3 connection depends on whether the vehicle has a factory amplified system. Plug it into the appropriate port on the RP5-GM61.
6. Remove the factory radio and connect the RP5-GM61's Vehicle Connectors 1, 2, & 3 into the factory vehicle harness. Vehicle Connector 3 may not be present in all vehicles. For vehicles with IOA / IOB build codes, use Vehicle Connector 7 to adapt your main harness.
7. Vehicle Connectors 4 & 5 are mandatory when removing the factory CD player to maintain the MOST loop integrity. Failure to connect them will result in no sound. Not all connectors may be present.
8. Vehicle Connector 6 (GM5CAM-DIS-HAR) is used in vehicles with an IOB Build Code and connects to the harness plugged into the factory display after removal, to maintain the camera signal.

Connector Identification:

• Interface Connectors: 1 (3-pin), 2 (20-pin), 3 (12-pin), 4 (24-pin).
• Vehicle Connectors: 1 (20-pin), 2 (16-pin), 3 (8-pin), 4 (10-pin), 5 (12-pin), 6 (20-pin), 7 (Adapter).

Wiring Connections Chart

This chart details the connections between the aftermarket radio and the vehicle harness:

IMPORTANT NOTES REGARDING GREEN / BLACK WIRE CONNECTIONS: A 60" pigtail is provided for connecting the SWC input to the GM61 module. This pigtail has a bullet connector on one end and a loose wire on the other. It is designed to plug into the matching bullet connector on the GM6X-HAR, both of which have a matching SWC Input label.

Wiring Connections (Continued)

1. Make all connections as described in the chart. Review all connections before plugging the harness into your vehicle.
2. For vehicles with IO5 / IO6 RPO CODE, steering wheel control buttons must be hardwired into the RP5-GM61. Locate the wire by removing the steering wheel shroud, accessing pin 9 at the Black 10-pin connector at the base of the clock spring (Fig. 1). Connect the provided 60" Green/Black wire from the GM61 module to this wire. Soldering this connection is highly recommended for consistent operation. Do not cut this wire in half.
3. Plug in the CMX chime module if needed. This is always necessary unless the vehicle has a factory BOSE amplifier. Connect the CMX to the 2-pin "CMX Module" pigtail and install it in a location where it can be easily heard, typically low in the dash facing downward.
4. Connect the SWC wire or the 3.5mm SWC jack to the aftermarket radio according to the chart. The aftermarket radio must support a wired remote input.
5. To reassign SWC functions, follow the programming instructions on page 5.
6. Connect the Red and White RCAs to the aftermarket radio's AUX input to retain the factory 3.5mm AUX input jack.
7. If the vehicle has the base level radio (IO3) and a factory reverse camera, connect the Yellow RCA in the harness to the reverse camera input on the back of the radio. For IO4, IO5, or IO6 systems, follow notes "A & B" for reverse camera retention. Refer to the vehicle's RPO CODE sticker. Disregard the Yellow RCA on the main GM6X-HAR when using the CAM-GM51.
   • a. Connect the supplied CAM-GM51 Harness (Fig. 2). This harness connects at the Human Machine Interface Control Module (HMICM), typically found behind the glove box or high in the passenger side kick panel. The HMICM will have USB and LVDS cables connected to it.
   • b. The factory reverse camera is powered by the vehicle, not the HMICM. The camera remains powered even when disconnected from the HMICM, so no additional wiring is needed for power.

Programming Button and Adjustment Dial Functions

Press and hold the programming button to access different programming modes. Release the button when the desired mode's LED is lit.

PLEASE NOTE: This process requires the interface to be in the vehicle with the key in the ignition position.

• A. LED 1 flash green: SWC re-assignment. Allows re-assigning SWC functions to desired buttons. Refer to Optional Steering Wheel Control Programming instructions.
• B. Both LEDs flash green: Chime volume adjustment. Use the adjustment dial to set chime volume. Refer to note 6 under Testing and Verification.
• C. Both LEDs flash red: Master reset. Resets the interface to factory defaults, including SWC Mapping, Infotainment Settings, and Interface User Options.

Default Steering Wheel Control Programming

This table outlines the default SWC button assignments for various radio brands:

Optional Steering Wheel Control Programming

Programming Steps:

1. Turn the key to the ignition position.
2. Press and release the programming button on the interface.
3. Within 7 seconds, press the steering wheel button to be learned. LED 1 will turn red.
   • A. Short Press: Release the button within 1.5 seconds. LED 1 returns to green.
   • B. Long Press: Hold the button until LED 1 blinks. Release the button; LED 1 returns to green.
4. Repeat step 3 for each additional audio function.
5. If a function is not available or not desired, press and release the programming button to skip it.
6. After programming, wait seven seconds. LED 1 will flash three times to indicate completion.
7. Test the interface. LED 1 should illuminate green when a steering wheel button is pressed.
8. If any function fails, repeat the programming steps.

Optional Programming Order: This table lists functions and their order for programming across different brands.

Note: For brands not listed, use "ALL OTHER BRANDS." On entries with multiple commands, commands are source-dependent.

RadioPRO PC App

Download the RadioPRO PC App from pac-audio.com/app-downloads to:

• Configure User Interface Options: Factory amplifier settings, Chime Volume, Telematics Volume, Change Vehicle Settings.
• Update Product Firmware.
• Read Firmware/Hardware Versions.

PLEASE NOTE: The interface must be connected to the vehicle for features like Factory Amplifier Settings, Chime Volume, Telematics Volume, Change Vehicle Settings, and Interface User Options. Firmware Updates and reading versions do not require the vehicle connection.

OnStar Volume Adjustment for Vehicles without SWC

• If steering wheel controls (SWC) are not present, use the Adjustment Dial on the interface to set the desired OnStar volume level.
• When OnStar is active, turn the Adjustment Dial to reach the desired level.

Testing and Verification

1. Turn the ignition on. The interface LED will illuminate, and the +12v accessory wire will be active.
2. Turn on the radio and check balance and fade settings.
3. Pressing the OnStar button on the rearview mirror should mute all other audio and allow OnStar audio to be heard.
4. Verify that all SWC functions operate correctly for both the aftermarket radio and OnStar. To adjust OnStar volume, press the OnStar button on the mirror or steering wheel, then use the SWC volume buttons. If the vehicle lacks steering wheel controls, use the interface's adjustment dial.
5. Verify that chimes are functioning. Chimes will play from the front left speaker. If an aftermarket amplifier is used, chimes will play through the supplied CMX Module.
6. To adjust chime volume: With the vehicle on, press and hold the programming button until both LEDs flash green, then release. Use the adjustment dial to set the volume. An audible chime confirms adjustment if no BOSE amp is present. If a BOSE amp is present, a sleep cycle is needed to hear changes. Chime adjustment mode times out after 10 seconds of inactivity.
7. For vehicles without BOSE, use the adjustment dial on the CMX module (see image) to adjust chime volume.
8. Turn off the vehicle and remove the key. RAP will keep the radio on for 10 minutes or until the driver's door is opened.

Technical Support and Product Updates (Firmware)

The RP5-GM61 can be updated with new firmware via a USB cable and the RadioPRO PC application. Visit www.pac-audio.com/firmware for updates.

Email: support@PAC-audio.com

Standard / International: 727-592-5991