Introduction

This section contains comprehensive documentation for the AutoPi TMU CM4 device. While the content is tailored specifically for this device, many concepts may apply to earlier generation models.

Quick Links

Getting started | Dimensions | Specifications | State of the device | OBD connector pinout | Missing data | 4G Troubleshooting

Core Features

Feature	Description
Global 4G/LTE Connectivity	Integrated modem with worldwide coverage
Dual CAN Interface	Native support for dual CAN bus connections with expansion capabilities
Flexible Deployment	Works as both factory-integrated OEM solution and aftermarket add-on
Power Fail-Safe Design	Proven fail-safe power management for seamless operation
Full Linux OS	Runs on proven, stable Raspberry Pi OS with long-term support
Infinite Extensibility	Customizable for business and personal use cases
Upgradeable Hardware	Support for CPU and RAM expansion
Automotive Certified	CE and FCC certified for global automotive use
Built-in Security	Secure data encryption and protection

Key Technical Highlights

Advanced Automotive Interface

The device features a dual CAN interface with support for multiple parallel connections. The integrated Diagnostics over IP (DoIP) support enables advanced vehicle diagnostics capabilities.

Linux-Based Operating System

Built on Raspberry Pi OS, AutoPi Core provides a robust, well-tested foundation with extensive possibilities for extensions and integrations. The open-source architecture ensures long-term stability and compatibility.

Open-Source Architecture

Full access to open-source drivers and core implementations via the AutoPi GitHub repository enables custom development and community contributions.

High-Performance Computing

Broadcom BCM2711 Quad-core Cortex-A72 processor (ARM v8) running at 1.5GHz delivers enterprise-grade performance. Includes 1GB LPDDR4 RAM with integrated GPU. Upgradeable to higher memory configurations for demanding applications.

Optional Accessories

Connectivity & Power

• Global SIM Card Solution – Works in 188+ countries with reliable global connectivity
• OBD-II Power Cable – Power your device from any 12-24V DC power supply

OBD Expansion & Interface

• OBD-II Extension Cable – Extends reach for flexible device placement in any vehicle
• OBD-II Splitter Cable – Connect additional OBD-II devices simultaneously
• OBD-II to Dual DB9 Adapter – Connect two CAN bus nodes to the OBD2 port
• Tesla OBD-II Adapter (Model 3/Y) – Add OBD-II port to Tesla vehicles

Advanced Diagnostics

• DoIP HAT – Advanced Diagnostics over IP (DoIP) interface module for enhanced vehicle diagnostics

Mounting & Integration

• Dual Lock Extreme Velcro Strip – Secure, vibration-resistant mounting solution
• Micro USB-A Adapter Cable – Compatible external USB adapter for TMU CM4