PAC AP4-GM71 AmpPRO Amplifier Integration Interface for Select 2019-2026 GM Vehicles with Bose

PAC AP4-GM71 AmpPRO Amplifier Integration Interface for Select 2019-2026 GM Vehicles with Bose

Complete amplifier integration module and T-harness for installing aftermarket amplifiers in select 2019-2026 GM vehicles with a factory Bose sound system, retaining all factory radio controls and audio features while delivering 6-channel RCA outputs, optical digital output, and wired remote level control.

Product Overview

The PAC AmpPRO AP4-GM71 is a purpose-built amplifier integration interface designed for select 2019-2026 GM vehicles equipped with a factory Bose audio system. Adding an aftermarket amplifier to these vehicles without a dedicated interface results in the loss of factory audio features, volume-linked control, and system integration. The AP4-GM71 solves this by tapping into the vehicle's data bus via a plug-and-play T-harness, delivering clean, variable RCA outputs to the aftermarket amplifier while fully preserving the factory radio's fit, finish, and feature set — including navigation audio, Bluetooth, OnStar, parking sensor chimes, safety alerts, and infotainment audio.

Six-channel RCA pre-outputs (front, rear, and sub) provide up to 5V RMS switchable output, with a wired remote level control knob included for the non-fading subwoofer channels. A data-controlled remote turn-on lead activates the amplifier automatically with the factory radio. An optical Toslink digital output is also included for use with high-end digital signal processors and amplifiers, though no optical cable is supplied.

The AP4-GM71 is also configurable via the AmpPRO PC App (Windows only), which allows adjustment of minimum volume level, chime volume, and a 3-band EQ with frequency and Q-factor control. Firmware updates are also delivered through the app.

Important: Compatibility requires the vehicle to have a Bose Infotainment system with RPO code IOS, IOT, or IOK. Verify the RPO code on the silver sticker in the glove compartment or by scanning the QR code on the GM label in the driver's door jamb.

Features & Benefits

6-Channel RCA Pre-Outputs Provides Left/Right Front, Left/Right Rear, and two non-fading subwoofer RCA outputs. Switchable between 5V and 4V RMS output via dip switch to suit different amplifier input sensitivities.

Retains All Factory Radio Controls and Audio Features Preserves factory navigation audio, Bluetooth, OnStar, parking sensor chimes, safety alerts, and infotainment features through the aftermarket amplifier, maintaining the complete factory audio experience.

Wired Remote Level Control for Sub Channels Includes a 6-foot wired level control knob for the subwoofer (non-fading) channels, mountable in an accessible location for convenient bass level adjustment. If not connected, the subwoofer channel output defaults to maximum.

Data-Controlled Remote Turn-On Lead A data-controlled remote turn-on wire activates the aftermarket amplifier automatically when the factory radio is switched on. Rated at 2A; an external relay is required if higher current draw is needed.

Optical Toslink Digital Output A variable 2-channel Toslink optical output is provided for connection to high-end digital processors or amplifiers requiring a digital signal input. No optical cable is included.

AmpPRO PC App Configuration (Windows) The optional AmpPRO PC App allows configuration of minimum volume level, chime volume, and a 3-band parametric EQ (Bass, Mid, Treble) with selectable frequency and Q-factor settings, as well as firmware updates. The app is available from PAC and runs on Windows PC only.

Compatible with GM Super Cruise The AP4-GM71 is compatible with vehicles equipped with GM's Super Cruise driver assistance feature.

Plug-and-Play T-Harness Includes a vehicle-specific T-harness for direct connection to the factory radio harness with no cutting or permanent modification to the factory wiring.

Technical Specs

Compatible With / Goes Well With

Important: The AP4-GM71 is only compatible with GM vehicles equipped with a factory Bose Infotainment system with RPO code IOS, IOT, or IOK. Verify your vehicle's RPO code before purchasing.

Goes Well With:

• Aftermarket monoblock or multichannel amplifier
• RCA Y-adapter (required if running sub output to a 2-channel amplifier input, sold separately)
• External relay (required if amplifier remote draw exceeds 2A, sold separately)
• Toslink optical cable for digital processor connection (sold separately)
• Aftermarket subwoofer or speaker system

Frequently Asked Questions

How do I know if my GM vehicle is compatible with the AP4-GM71?

Your vehicle must be equipped with a Bose Infotainment system with RPO code IOS, IOT, or IOK. To verify, check the silver sticker inside your glove compartment for these RPO codes. If the sticker is not present, scan the QR code on the GM label in the driver's door jamb. RPO codes are listed in alphabetical order in both cases. The AP4-GM71 is not compatible with non-Bose or standard audio system variants of the listed models.

Does the AP4-GM71 retain factory features like navigation audio and OnStar?

Yes. The AP4-GM71 retains all factory audio features routed through the infotainment system, including navigation prompts, Bluetooth audio, OnStar communications, parking sensor chimes, safety alerts, and other infotainment audio. These signals are passed through to the aftermarket amplifier alongside the primary audio output.

What is the AmpPRO PC App and do I need it?

The AmpPRO PC App is a free Windows application available from PAC that allows you to configure the minimum volume level, chime volume level, and a 3-band parametric EQ on the AP4-GM71, as well as update the module's firmware. The app is optional — the interface functions without it — but it provides additional fine-tuning capability that is particularly useful for matching the system's output to a custom amplifier installation. The app is Windows only and is not required for basic operation.

Do I need an RCA Y-adapter for the subwoofer output?

If your amplifier requires two separate RCA inputs for the subwoofer channels, yes. The AP4-GM71 provides a single sub RCA output per channel (two total). If your amplifier has a bridged mono input requiring two RCA connections, an RCA Y-adapter is required and is sold separately.

What happens if I do not connect the level control knob?

If the supplied wired level control knob is not connected to the interface module, the subwoofer channel output will default to maximum output level at all times. For systems where sub bass level adjustment is needed, the knob should be mounted in an accessible location such as under the dash or in a centre console cavity.