ATOTO

Android Car Stereo

A5L Gen 2 Series

INSTALLATION MANUAL

Compatible Models

For SKUs below:

• Universal Car Head Unit Double-DIN: A5PG2A7T, A5PG2B7T
• EdgeFit Mount Head Unit  Double-DIN: A5PG211T

This installation guide is intended for the ATOTO A5L Gen 2 model listed above.

Before installation, please confirm that the product model matches the SKU shown in this guide.

Preface

Thank you for choosing ATOTO

As an innovative brand with a decade of dedicated expertise in automotive electronics, ATOTO upholds the core philosophy of "Different. Better. Trusted". We seamlessly integrate professional audio-visual technology and user-friendly interactive features to elevate every journey with refreshing experiences.

• Different – We deliver products that stand apart through thoughtful design, innovation, and user‑oriented features.
• Better – We integrate professional audio‑visual technology with intuitive interaction to elevate every journey with superior experiences at an accessible price.
•  Trusted – Endorsed by millions of users worldwide, ATOTO has earned a reputation for reliable products and responsive service you can count on.

This philosophy guides everything we do—from long‑term R&D investment, to continuous product improvement, to prompt customer support. With ATOTO, you can always expect something different, something better, and above all, something trusted.

Copyright Statement

The copyright and related intellectual property rights of these manuals (including electronic and printed versions) are exclusively owned by ATOTO. Without explicit written authorization from ATOTO, no organization or individual may use the content in any form (including but not limited to copying, distributing, adapting, translating, mirroring, or reposting) for commercial purposes or provide it to third parties.

FCC Compliance Statement

The FCC Compliance Statement is an official declaration by ATOTO to users indicating that the product complies with the radio frequency interference and electromagnetic compatibility (EMC) regulations of the U.S. Federal Communications Commission (FCC). The specific statement is as follows:

This device strictly complies with all provisions of Part 15 of the FCC Rules.

Operation is subject to the following two conditions:

1.This device must not cause harmful interference;

2.This device must accept any interference received, including interference that may cause undesired operation.

Contact ATOTO Customer Support

If you encounter any issues during installation or use, our support team is ready to assist.

Email: support@atotoglobal.com

Important Information

About this Manual

This installation manual is intended to guide you through the basic installation process of your ATOTO product. If you would like to explore more detailed feature operations and settings, please refer to the “Operation Tutorials” section, as shown in the image below.

Installation Warnings

CERTIFIED PROFESSIONAL INSTALLATION

Installation or service performed by individuals without proper training or experience in consumer electronics and automotive accessories may pose serious risks, including electric shock, injury, or other hazards. If you are unfamiliar with car electronics or lack installation experience, we strongly recommend seeking professional assistance to avoid potential injury or damage during installation.

Please note that installation procedures may vary depending on the make and model of your vehicle. Adjustments should be made based on your specific vehicle structure and dashboard configuration.

DISCONNECT THE BATTERY BEFORE INSTALLATION

To prevent electrical shorts, always disconnect the vehicle's NEGATIVE (-) battery terminal before beginning installation. Failure to do so may lead to electric shock, fire, or damage to the product and surrounding property.

DO NOT DISASSEMBLE OR MODIFY THE PRODUCT

Attempting to disassemble or alter the product may cause fire, electric shock, or result in an accident.

USE ONLY FUSES WITH THE SPECIFIED RATING

Replacing fuses with incorrect ratings may cause fire or result in serious property damage.

PARKING BRAKE WIRING MUST BE INSTALLED CORRECTLY

Improper installation may allow video playback while the vehicle is in motion, potentially distracting the driver and increasing the risk of a serious accident. This can lead to severe injury to the driver and passengers.

What Comes in the Box

Standard Accessories

ISO Connector(A/B) (For European market only)

Two ISO wiring options, Type A and Type B, are provided for different European vehicle wiring configurations. Although the connectors look similar, their pin assignments differ.

Important:

Confirm which ISO type your vehicle requires before installation. Using the wrong connector may cause the head unit to fail to power on, reboot repeatedly, or operate incorrectly.

SKU-Dependent Accessories

The following accessories are included only with selected SKUs or bundle configurations:

Note: These accessories are not included with every A5L Gen 2 package. Please refer to the product listing or your specific SKU configuration for the actual package contents.

Chapter 1 — Head Unit Overview

1.1 Front Panel Appearance

1.1.1 A5PG2A7T — 7-inch Touchscreen with Physical Buttons Panel

1.1.2 A5PG2B7T — 7-inch Full Touchscreen Panel

1.1.3 A5PG211T — 10.1-inch Full Touchscreen Panel

1.2 Main Rear Ports Introduction

8-Pin Leads

⑤ Rear Left Audio Out (RL)

⑥ Rear Right Audio Out (RR)

⑦ RCA 4.2 SUR R / RCA 5.1 CENTER Output

⑧ Protocol Port CAN Bus Interface

Left-Side Ports

• FM/AM Antenna Input (FM-ANT)
• GPS Antenna Input
• Optical S/PDIF Output
• Coaxial Digital Audio Output (COAXIAL)

20-Pin Leads

⑨ Subwoofer Out (SUB)

⑩ Video Input (VIN)

⑪ Left Channel Auxiliary Input(LIN)

⑫ Right Channel Auxiliary Input(RlN)

⑬ Front Right Audio Out(FR)

⑭ Front Left Audio Out (FL)

⑮ Amplifier Turn-on(+)

⑯ Front Camera IN 

⑰ External Microphone Input

10-Pin Leads

① Backup CAM Input

② Bluetooth Antenna

③ Brake Detection

④ Wi-Fi Antenna

6-Pin Leads

USB2 Cable - External Storage

4-Pin Leads

USB1 Cable

PIN1 [White] Front Left(+)

PIN2 [White/Black] Front Left(-)

PIN3 [Grey] Front Right(+)

PIN4 [Grey/Black] Front Right(-)

PIN5 [Orange/Black] Steering Wheel Key(+)

PIN6 [Pink] Rear Camera(+)

PIN7 [Red] Accessory/ignition(+)

PIN8 [Black] Chassis Ground(-)

PIN9 [Purple/Black] Rear Right(-)

PIN10 [Purple] Rear Right(+)

PIN11 [Green] Rear Left(+)

PIN12 [Green/Black] Rear Left(-)

PIN13 [Blue] Power Antenna(+)

PIN14 [Brown/Black] Steering Wheel Key#(+)

PIN15 [Orange] Dimmer/illumination (+)

PIN16 [Yellow] Constant/Battery Power(+)

Steering Wheel Audio Control 3.5mm Jack

(If applicable)

Chapter 2 — Unit Installation

2.1 Mounting Accessories (Optional)

• Movable Mounting Brackets

• Double-DIN Side Brackets

• Mounting Screws

Note: These mounting accessories are used as needed, depending on the vehicle dashboard and installation configuration.

2.2 Installation Process

Step 1 — Install the Double-DIN Side Brackets

Install the Double-DIN Side Brackets on the left and right sides of the installation frame, then secure them with the appropriate screws.

Step 2 — Install the Movable Mounting Brackets

Install the Movable Mounting Brackets onto the installation frame, then secure each side with screws.

Note: Adjust the bracket position and screw mounting points according to the actual dashboard installation requirements.

Step 3 — Install the GPS Antenna

Install the GPS antenna on the vehicle's dashboard or parcel shelf.

Note:

1. Do not place the GPS antenna above sensors or vents on the vehicle dashboard.

2. Clean and dry the mounting surface before securing the antenna.

3. Mount the antenna flat and level.

4. On some vehicles with signal blocking glass, the antenna must be installed on

the exterior of the car.

Step 4 — Complete Wiring and Install the Head Unit

For detailed wiring instructions, refer to Chapter 3 — Wiring Connection Instructions before proceeding.

After all wiring connections are completed, power on the head unit and verify that all required functions operate properly.

Once the functional check is complete, carefully place the assembled head unit into the dashboard and secure it in position.

Important: Do not permanently secure the head unit until the wiring and basic functions have been checked.

Chapter 3 — Wiring Connection Instructions

This section explains the functions and recommended connection points for each wire and interface on the ATOTO head unit. Make all wiring connections carefully. If you are unsure about any connection, consult a qualified professional installer.

Important Notes Before Wiring

• Insulate all unused input/output wires individually with electrical tape, heat-shrink tubing, or suitable insulated crimp connectors to prevent short circuits.
• Do not use wire nuts for vehicle wiring connections.
• If the fuse needs to be replaced, use only a fuse of the same type and rating: 15 A.
• Connect the Dimmer Input wire to the vehicle's parking-light/illumination circuit if automatic night-time dimming is required.
• Connect the Reverse Input wire to the vehicle's reverse-light positive wire so the rear-view camera can switch on automatically when the transmission is shifted into reverse.
• For vehicles that require a third-party steering wheel control (SWC) adapter, contact a qualified installer or ATOTO Support at support@atotoglobal.com to confirm a compatible adapter for your specific vehicle.

Important: Disconnect the vehicle battery's negative terminal before making or modifying wiring connections whenever appropriate for the vehicle. Follow the vehicle manufacturer's service precautions, especially for vehicles equipped with airbags, retained accessory power, or other electronically controlled systems.

Part 1: Main Power Harness Introduction(16-Pin Connector)

Part 2: Main Ports Introduction

Module 1: Left-Side Ports

• FM/AM Antenna Input (FM-ANT)

Connect the vehicle's FM/AM radio antenna cable to this port for radio signal reception.

Note:

Depending on the vehicle, an antenna adapter may be required. If the factory antenna uses an active amplifier, make sure the antenna amplifier power wire is connected correctly.

• GPS Antenna Input

Connect the included GPS antenna to this port for satellite positioning and navigation.

*For best reception, install the GPS antenna in an open position with minimal obstruction from metal parts.

• Optical S/PDIF Output

Provides a digital optical audio signal for connection to an external amplifier or audio processor that supports optical S/PDIF input.

• Coaxial Digital Audio Output (COAXIAL)

Provides a digital coaxial audio signal for connection to an external amplifier or audio processor that supports coaxial digital audio input.

Module 2: 10-Pin Leads

⑤ Backup CAM Input

Connect the included backup camera to this input.

When the vehicle is shifted into reverse and the reverse trigger signal is detected, the car stereo can automatically display the rear camera image.

Note:

Make sure the backup camera is connected to the correct rear camera input and configured properly in Camera Settings.

⑥ Bluetooth Antenna

This lead functions as the Bluetooth antenna and does not require connection to any vehicle wire.

During installation, fully extend the antenna lead and secure it in an open area behind the dashboard to help improve Bluetooth signal reception and connection stability.

Avoid placing the antenna directly against large metal surfaces or bundling it tightly together with power cables.

Note:

Do not connect the Bluetooth antenna wire to power, ground, or any other vehicle wiring.

⑦ Brake Detection

Connect this wire to the vehicle's parking brake (-) signal.

The car stereo uses this signal for supported driving-safety functions, such as restricting video playback while the vehicle is in motion.

⑧ Wi-Fi Antenna

This lead functions as the Wi-Fi antenna and does not require connection to any vehicle wire.

Fully extend the antenna lead and secure it in an open area behind the dashboard to help improve Wi-Fi reception and hotspot performance.

For best performance, keep the antenna away from large metal surfaces, high-current power cables, and other sources of electrical interference.

Note:

Do not connect the Wi-Fi antenna wire to power, ground, or any other vehicle wiring.

Module 3: 6-Pin Leads

6P-USB Cable — External Storage / USB Dash Camera

Connect the USB cable to the 6-pin port on the rear of the car stereo.

This USB port can be used to connect external storage devices, such as a USB flash drive, for media playback and supported file access. It can also be used to connect a compatible USB Dash Camera.

Module 4: 4-Pin Leads

4P-USB Cable

Connect the USB cable to the 4-pin port on the rear of the car stereo.

This USB port is mainly used for Phone Link / smartphone connection functions, including supported wired phone mirroring, wired Apple CarPlay, or wired Android Auto.

Note:

Use a compatible USB data cable for phone connection. Charging or data-transfer performance may vary depending on the connected device and cable.

Module 5: 8-Pin Leads

① Rear Left Audio Out (RL)

Provides the rear-left RCA preamp audio signal.

Connect this output to the rear-left channel input of an external amplifier or compatible audio system.

② Rear Right Audio Out (RR)

Provides the rear-right RCA preamp audio signal.

Connect this output to the rear-right channel input of an external amplifier or compatible audio system.

③ RCA 4.2 SUR R / RCA 5.1 CENTER Output

This RCA output serves different audio channels depending on the selected sound output mode:

4.2-Channel Mode: Functions as the Surround Right (SUR R) audio output.

5.1-Channel Mode: Functions as the Center (CENTER) audio output.

Connect this output to the corresponding channel input of an external amplifier or compatible audio system.

④ Protocol Port CAN Bus Interface

Connect this port to the compatible CAN Bus decoder/interface box supplied or specified for the vehicle.

Module 6: 20-Pin Leads

⑨ Subwoofer Out (SUB)

Provides an RCA preamp audio signal for a subwoofer.

Connect this output to the subwoofer input of an external amplifier, powered subwoofer, or compatible DSP/audio processor.

⑩ Video Input (VIN)

Provides an AUX composite video input for an external video source.

Connect the video output of a compatible external device to this input, then open the AUX app to view the video.

Note:

Video playback may be restricted while driving according to the system's driving-video safety settings.

⑪ Left Channel Auxiliary Input (LIN)

Connect the left-channel analog audio output of an external AUX audio source to this RCA input.

Use together with RIN for stereo AUX audio input.

⑫ Right Channel Auxiliary Input (RlN)

Connect the right-channel analog audio output of an external AUX audio source to this RCA input.

Use together with LIN for stereo AUX audio input.

⑬ Front Right Audio Out (FR)

Provides the front-right RCA preamp audio signal.

Connect this output to the front-right channel input of an external amplifier, or compatible audio system.

⑭ Front Left Audio Out (FL)

Provides the front-left RCA preamp audio signal.

Connect this output to the front-left channel input of an external amplifier, or compatible audio system.

⑮ Amplifier Turn-on (+)

Provides a control signal for turning on a compatible external amplifier or other supported audio equipment when the A5P is powered on.

Connect this lead to the REMOTE / REM / AMP-CON terminal of the external amplifier.

⑯ Front Camera IN 

Connect a compatible front-view camera to this input.

The camera image can be viewed through the FCAM app

⑰ External Microphone Input

Connect a compatible external microphone to this input for supported hands-free calling, voice commands, and other microphone functions.

For best voice pickup, install the microphone near the driver, such as around the upper A-pillar or near the rear-view mirror, while keeping it away from speakers and direct airflow.