HMI (Human Machine Interface)

Modules

The primary infotainment computer in most 2013–2020 GM vehicles with MyLink, IntelliLink, or first-generation CUE.

The HMI (Human Machine Interface) module is the primary infotainment controller used on most 2013–2020 GM vehicles equipped with MyLink, IntelliLink, or first-generation CUE. It is the computer — separate from the touchscreen, separate from the radio (ACM), and separate from the speakers — that boots the infotainment operating system and drives everything visible on the center display.

The HMI handles touchscreen input, Apple CarPlay and Android Auto (on HMI 2.5+), factory navigation (on IO6 configurations), Bluetooth pairing, voice recognition, backup-camera rendering, and communication with the radio, instrument cluster, amplifier, and media disc player over GM’s MOST bus.

HMI generations:

  • HMI 1.0 — Pre-production engineering hardware. Never shipped to customers.
  • HMI 1.1 — 2013 Cadillac CUE only (ATS, XTS, SRX). Rare. Capacitive touch.
  • HMI 2.0 — 2014–2015 across the GM lineup. Dual-core processor, 8 GB eMMC. No CarPlay or Android Auto.
  • HMI 2.5 — 2016 through approximately 2019/2020. Quad-core processor, 16 GB eMMC. Adds wired CarPlay and Android Auto.

The architectural successor to the HMI is the CSM (Center Stack Module), used on 2019+ refreshed GM platforms. Some GM service literature and resellers refer to the CSM under a unified “HMI / CSM 3.0, 3.5, 3.6, 3.7, 3.8” naming convention. Physically and architecturally, however, the HMI and CSM are distinct modules — different connectors, different chassis, and different supplier (Bosch HMI vs Harman CSM). They are not interchangeable.

For the complete technical breakdown, see the WAMS HMI Guide.

Vehicle Applicability

2013–2020 Chevrolet, GMC, Cadillac, and Buick vehicles with 8-inch displays and IO4, IO5, or IO6 RPO codes. Confirm via the SPID label, typically in the glove box.

Also known as: Human Machine Interface, infotainment module, infotainment head unit, infotainment computer

Related Terms

  • CSM — GM's unified next-generation infotainment computer that replaced the HMI starting on select GM platforms in mid-2017.5.
  • ACM — The radio/head-unit module in GM HMI-based infotainment systems containing the AM/FM/HD/SiriusXM tuner and base amplification.
  • BCM — The central body-electronics computer in a GM vehicle. Owns lights, locks, windows, anti-theft authority, and the VIN authority other modules authenticate against.
  • IO4 — The GM RPO code for the base 4.2-inch color display infotainment configuration found on entry-level trims of 2014–2016 GM trucks and SUVs.
  • IO5 — The GM RPO code for the non-navigation HMI 2.0/2.5 infotainment configuration found on most 2014–2019 GM vehicles.
  • IO6 — The GM RPO code for the HMI infotainment configuration with embedded factory navigation, found on premium-trim 2014–2019 GM vehicles.
  • MyLink — Chevrolet's branded infotainment interface, used on HMI-based vehicles from 2013 onward.
  • IntelliLink — GMC's and Buick's branded infotainment interface, used on HMI-based vehicles from 2013 onward.
  • CUE — Cadillac's branded infotainment interface. First-generation CUE (2013–2016) used HMI hardware; later CUE branding sits on CSM hardware.
  • MOST bus — The high-speed multimedia network that connects HMI, radio, and amplifier on GM HMI-based vehicles. GM's implementation uses copper conductors in a ring topology.
  • Waiting for Update Media — The on-screen message displayed when a GM HMI module's flash memory has corrupted to the point that the infotainment OS can no longer boot. A definitive HMI failure indicator.
  • Ghost Touch — A symptom where the touchscreen registers phantom inputs without the user touching it. Almost always a failed screen assembly, not a failed HMI.
  • Theft Lock — The anti-theft state a GM radio or module enters when its stored VIN doesn't match the vehicle's VIN. Renders the unit non-functional until properly reprogrammed.
  • VIN Programming — The process of configuring a GM electronic module to a specific vehicle's VIN and option content so it operates as if installed at the factory.

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