RP5-GM61 Radio Replacement Interface

Introduction and Features

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

Important Notes

1. Please make your vehicle settings selections before removing the factory radio for optimal installation time. Once the radio has been removed, the vehicle settings which are normally selected through the factory radio can be accessed and changed by downloading and installing the PAC RadioPRO PC Application from www.pac-audio.com/firmware.
2. Before removing your factory radio, please review the following settings as these will not be retained once the factory radio is removed: Ambient Lighting Control, OnStar Text, Teen Driver Feature, Performance Data Recorder, Valet Mode, Custom Launch Control (Line Lock, Launch Control), Rear Park Assist Symbols displayed on Reverse Camera Image.
3. When you plug in the module for the first time, it must go through an initialization process that takes up to 12 seconds. Make sure you have the vehicle running during this process.
4. The radio select DIP switches on the side of the interface must be adjusted to the proper radio setting before plugging the interface into the vehicle (see page 2 for setting chart).
5. The Voice button can be set to activate the factory OnStar function by using the RadioPRO PC Application. By default, this button is re-programmed to control the aftermarket radio's voice function.
6. For retaining OnStar, you must add on an additional RPA-SPK Chime speaker if you are using an aftermarket amplifier on Mids & Highs that can be purchased separately.
7. The interface comes pre-programmed for all of the vehicle's factory SWC functions and does not require programming unless you wish to re-assign the SWC functions, utilize the buttons that have no initial programming, 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 flash 4 times. Chevrolet Malibu will require SWC re-mapping. By default, volume up/down and track up/down are reversed.
8. Language: In some vehicles, the language setting is controlled over MOST. Please make sure that you adjust this accordingly before removing the radio, as this will not show up in most cases after your install.
9. Please reference the vehicle's RPO CODE sticker normally located in the vehicle's glove box or the underside of the spare tire cover.

Module Layout

The module features an Adjustment Dial, a USB Port, a Programming Button, Radio Select DIP switches, Interface Connector 4, Interface Connector 1 (with Expansion Port), and Interface Connector 2. It also indicates Non-Amplified Audio Output, Amplified Audio Output, LED 1, and LED 2.

Installation Steps

Set DIP switches that correspond with your radio to the ON position. Set all other DIP switches to the OFF position.

DIP Switch Settings Chart

If your brand is not listed above, please use "ALL OTHER BRANDS."

1. Set the Radio Select DIP switches according to the radio you are installing.
2. Wire your aftermarket radio to the RP5-GM61's 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. After cutting the loop, you will want to use the side that is next to the orange wire in pin 24. This will be used to wire to the Mute wire on your aftermarket radio if available.
4. Plug Interface Connectors 1 & 2 into the appropriate ports on the RP5-GM61 interface (using the diagram on page 1 or the label on the bottom of the interface).
5. The Interface Connector 3 connection port will be dependent upon whether or not the vehicle has a factory amplified system. Plug this connector into the appropriate port on the RP5-GM61 (using the diagram on page 1 or the label on the bottom of the interface).
6. Remove the factory radio and plug in the RP5-GM61's Vehicle Connector 1, 2, & 3 into the factory vehicle harness. Vehicle Connector 3 might not be present in all vehicles. In vehicles with IOA / IOB use Vehicle Connector 7 to adapt your main harness to your vehicle.
7. Vehicle Connectors 4 & 5 are used when removing the factory CD player in the dash and are mandatory that they are plugged in to keep the MOST loop intact. Failing to plug these in will result in no sound. Not all connectors may be present.
8. Vehicle Connector 6 (GM5CAM-DIS-HAR) will only be used in vehicles with an IOB Build Code and will be connected to the harness that was plugged into the factory display in the vehicle once removed. This is used to maintain the camera signal in IOB build code vehicles.

Interface Connectors: Interface Connector 1 (3-pin), Interface Connector 2 (20-pin), Interface Connector 3 (12-pin), Interface Connector 4 (24-pin).

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

Wiring Connections Chart

Aftermarket Radio Connections

SWC Connector

IMPORTANT NOTES REGARDING GREEN / BLACK WIRECONNECTIONS: There is a 60" Pigtail that is used for connecting the SWC input to the GM61 module that has a bullet connector on one end, and a loose wire on the other. This 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 above. Be sure to review all connections before plugging the harness into your vehicle.
2. In vehicles with an IO5 / IO6 RPO CODE, to retain the steering wheel control buttons you must hardwire them into the RP5-GM61. The wire you need to connect into can be found by removing the steering wheel shroud located beneath the steering wheel column, and accessing the wire in pin 9 at the Black 10-pin connector located at the base of the clock spring. (See Figure 1). Once you have located the Green/Black wire in the vehicle, you must connect the provided 60" Green/Black wire from the GM61 module. This is a data signal, so to ensure consistent operation, it is highly recommended to solder this wired connection. DO NOT cut this wire in half. In some vehicles, it may be necessary to remove the cover around the steering column and tag the wire in pin 9 at the Black 10-pin connector located at the base of the clock spring.
3. Plug the CMX chime module in if needed. It is always necessary unless the vehicle is equipped with the factory BOSE amplifier. Connect the CMX to the 2-pin Pigtail labeled "CMX Module" and install the CMX in a place free of obstructions, where it can be easily heard (usually 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 above (aftermarket radio MUST support a wired remote input).
5. If you wish to reassign functions to the SWC, then 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 was equipped with the base level radio (IO3) and a factory reverse camera, then connect the Yellow RCA in the harness to the reverse camera input on the back of the radio. If your vehicle is equipped with the IO4, IO5, or IO6 system, follow notes "A & B" below for reverse camera retention. Please reference the vehicle's RPO CODE sticker normally located in the vehicle's glove box or the underside of the spare tire cover. Please disregard the Yellow RCA on the main GM6X-HAR when using the CAM-GM51.
   • a. Connect the supplied CAM-GM51 Harness (See Figure 2). The CAM-GM51 harness connects at the Human Machine Interface Control Module (HMICM), not at the radio. The HMICM is normally found behind the glove box in trucks and SUVs, or high in the passenger side kick panel area in other vehicles. The (HMICM) will have the USB and LVDS cables connected to it.
   • b. The factory reverse camera is powered by the vehicle, not the HMICM. The camera will continue to be powered even when disconnected from the HMICM, so no additional wiring is required to supply the camera with power.

Programming Button and Adjustment Dial Functions

You can press and hold the programming button on the side of the interface to access different programming modes. Once the LED is lit to the mode you desire (see below for modes), immediately release the programming button to access that mode.

PLEASE NOTE: This process must be done with the interface in the vehicle and the key in the ignition position.

• A. LED 1 flash green: SWC re-assignment. This allows you to re-assign the SWC functions to the buttons of your choice. Please see the Optional Steering Wheel Control Programming instructions below for more details.
• B. Both LEDs flash green: Chime volume adjustment. This allows you to adjust the volume of the chimes using the adjustment dial on the side. Please see note 6 under Testing and Verification for more details.
• C. Both LEDs flash red: Master reset. This does a master reset of the interface and restores the following settings to factory defaults: SWC Mapping, Infotainment Settings, Interface User Options.

Default Steering Wheel Control Programming

Default SWC Button Assignments

Optional Steering Wheel Control Programming

Programming Steps:

1. Turn the key to the ignition position.
2. Press and release programming button on the side of the interface.
3. Within 7 seconds, press the button that is to be learned on the steering wheel. LED 1 will turn red when the button is pressed. At this point you have two options:
   • A. For short press functionality: Release the button within 1.5 seconds. LED 1 will turn back to green.
   • B. For long press functionality: Hold the button until LED 1 starts blinking. Release the button and the LED will go back to green.
4. Repeat step 3 for each additional audio function on the steering wheel.
5. If you come across a function in the chart that your steering wheel does not have, or you do not want to program, press and release the programming button on the side of the interface to skip that function.
6. Once programming is completed, wait seven seconds and LED 1 will flash three times indicating that programming has finished.
7. Test the interface for proper functionality. Whenever a button on the steering wheel is pressed, then LED 1 will illuminate green.
8. If any function does not work, repeat the programming steps.

Optional Programming Order

If your brand is not listed above, please use "ALL OTHER BRANDS." Please Note: On any entry with multiple commands, the commands shown are source dependent.

RadioPRO PC App

Download the RadioPRO PC App at: https://pac-audio.com/app-downloads/

Use of the RadioPRO PC App allows you to do the following:

• Configure User Interface Options such as: 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 when using the following features of the RadioPRO PC App: Factory Amplifier Settings, Chime Volume, Telematics Volume, Change Vehicle Settings, Interface User Options. The interface does not need to be connected to the vehicle when using the following features of the RadioPRO PC App: Firmware Updates, Reading firmware/hardware versions.

OnStar Volume Adjustment for Vehicles without SWC

1. If SWC buttons are not present, you must use the Adjustment Dial on the side of the interface until the desired level is reached.
2. When OnStar is active, turn the Adjustment Dial on the side of the interface until the desired level is reached.

Testing and Verification

1. Turn the ignition on. The LED on the interface will turn on and the +12v accessory wire will turn on.
2. Turn on the radio and check balance and fade.
3. Pressing the OnStar button on the rearview mirror will turn off all audio and allow the OnStar audio to be heard.
4. Verify that all SWC are functioning properly for both the aftermarket radio and OnStar. To adjust OnStar volume, press the OnStar button on the mirror or steering wheel, then use the volume buttons on the SWC to adjust the level. If the vehicle is not equipped with steering wheel controls, you can use the adjustment dial to raise the volume of the OnStar.
5. Verify that chimes are functioning. Chimes will play out of the front left speaker. If you have an aftermarket amplifier on your speakers, chimes will play out of the supplied CMX Module.
6. If you need to adjust the volume of the chimes: With the vehicle on, press and hold the programming button until both LEDs flash green, then release. Now turn the dial on the side of the module to adjust volume. If no BOSE amp, you will hear an audible chime during adjustment. If there is a BOSE amp, there is no audible chime, and you have to do a sleep cycle to hear the change. Chime adjustment mode will time out after 10 seconds of inactivity.
7. In vehicles without BOSE, use the adjustment dial on the side of the CMX module (See Image).
8. Turn off vehicle and remove key. RAP will be active and keep the radio on for 10 minutes or until the driver's door is opened.

Technical Support and Product Updates

The RP5-GM61 can be updated with new firmware as it becomes available using a USB cable and RadioPRO PC application. Please visit www.pac-audio.com/firmware for available updates.

Email: support@PAC-audio.com

Standard / International: 727-592-5991