1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your STRONGNAVI Car Android Radio Headunit. Designed specifically for Audi A3 8P, S3, and RS3 models from 2003 to 2012, this multimedia system enhances your driving experience with advanced features including Android OS, CarPlay, Android Auto, DSP, GPS navigation, 4G/WiFi connectivity, and more.

Figure 1.1: STRONGNAVI Headunit installed in an Audi A3 dashboard.
2. Package Contents
Please check the package contents carefully upon unboxing. If any items are missing or damaged, contact your seller immediately.

Figure 2.1: Package Contents for H1/H2 and H3/H4/H5 models.
Typical package contents include:
- Main Headunit Display
- Power Cable Harness
- RCA Cables
- GPS Antenna
- USB Cables
- CAN-Bus Decoder Box (if applicable for your vehicle model)
- User Manual (this document)
- Optional accessories (e.g., reversing camera, DVR, OBD2, TPMS, DAB+ dongle) are sold separately.
3. Specifications
The STRONGNAVI Car Android Radio Headunit comes in various configurations. Please refer to the table below for detailed specifications based on your model (H1, H2, H3, H4, H5, M90S).

Figure 3.1: Car Multimedia Player Parameter Comparison.
| Feature | Description |
|---|---|
| Brand Name | STRONGNAVI |
| Operating System | Android |
| Display Size | 8.8" (M90S is 9") |
| Resolution | 1280*480 |
| RAM | Up to 6GB |
| ROM | Up to 128GB |
| CPU | Octa Core, up to 2.0GHz (2*ARM Cortex A75 + 6* ARM Cortex A55) |
| GPU | Dual Core |
| Out Power | 45*4W |
| Voltage | 12 V |
| Item Weight | 1.3kg |
| Material | Plastic and Metal |
| Interface | Plug and Play |
| Special Features | Built-In Speaker/Microphone, WiFi Function, Support Steering Wheel Control, Support 3G/4G Network, Built-in GPS, Charger, Mobile Phone, MP3 players, Can-Bus Support |
| Digital Media Format | Mp3, MP4, WMA, JPEG |
| OSD Language | Multiple languages including English, German, French, Spanish, Italian, Portuguese, Russian, etc. |
| Certification | CE, FCC |

Figure 3.2: Octa Core CPU Architecture.
4. Installation Guide
Installation of the headunit requires technical expertise. It is highly recommended to have the product installed by a qualified professional at a car service store to prevent damage to the device or your vehicle. Incorrect installation may void your warranty.
4.1 Pre-Installation Check
- Ensure your vehicle is an Audi A3 8P, S3, or RS3 model manufactured between 2003 and 2012.
- Verify all package contents are present and undamaged.
- Disconnect the vehicle's battery before starting installation.
4.2 General Installation Steps (Consult a professional)
- Carefully remove the original car radio/headunit from the dashboard.
- Connect the provided wiring harness to the vehicle's existing wiring. Ensure all connections are secure.
- Connect the GPS antenna, USB cables, and any other accessories (e.g., reversing camera, DVR) to the new headunit.
- Mount the new headunit into the dashboard opening.
- Secure the headunit using the appropriate brackets and screws.
- Reconnect the vehicle's battery and test the unit.

Figure 4.1: Before and After Installation.
4.3 Rear Camera Connection
If installing an optional AHD reversing camera, follow these wiring instructions:
- Red cable ①: Connect to the backup light's positive (+) terminal.
- Black cable ②: Connect to the backup light's negative (-) terminal.
- Reversing detection cable ③ (Brown color): Connect to the red cable ④, which extends from the video input cable.
- Cable ⑤: This cable does not require connection.

Figure 4.2: Rear Camera Wiring Diagram.
4.4 4G SIM Card Installation (H3, H4, H5 models only)
For models with built-in 4G, locate the SIM card slot on the unit and insert your 4G SIM card. This allows for direct internet connectivity without relying on a phone hotspot.

Figure 4.3: 4G SIM Card Slot Location.
5. Operating Instructions
5.1 Initial Setup and Main Menu
Upon first power-on, the system will boot into the Android operating system. The main menu provides access to various functions like Navigation, Bluetooth, Radio, Music, Video, Car Settings, and Apps.

Figure 5.1: M90S Main Menu Interface.
5.2 Changing Main Menu Theme (M90S)
The M90S model offers 12 different main menu themes. To change the theme:
- Find the "Theme" icon on the main screen.
- Enter the theme interface and select your desired theme.

Figure 5.2: Main Menu Theme Selection.
5.3 CarPlay and Android Auto (H3, H4, H5 models)
These models feature built-in CarPlay (for iOS) and Android Auto. No additional accessories are needed.
5.3.1 Wireless CarPlay (iOS System)
- Connect your iPhone via Bluetooth.
- Click on "ZLINK" app on the headunit.
- Wait for the connection to establish.
5.3.2 USB Cable for Android Auto
- Connect your Android phone to the headunit using a USB cable.
- Click on "ZLINK" app on the headunit.
- Wait for the connection to establish.

Figure 5.3: CarPlay and Android Auto Connection.
5.4 Audio Settings (32EQ/DSP Processor - H3, H4, H5 models)
Models with the built-in 32EQ/DSP processor allow for advanced audio customization. Access the DSP settings to adjust multi-dimensional surround sound effects and equalizer presets for a high-definition audio experience.

Figure 5.4: 32EQ/DSP Processor Interface.
5.5 Radio Operation (FM/AM RDS Radio)
The headunit supports automatic and manual search for FM/AM radio stations. You can drag station icons to customize your channel list. Note: H1 and H2 models only support FM radio.

Figure 5.5: Radio Interface.
5.6 Split Screen Functionality
The split-screen feature allows two applications to be displayed simultaneously on the screen, enhancing convenience and multitasking while driving.

Figure 5.6: Split Screen View.
5.7 Language Settings
The headunit supports multiple OSD (On-Screen Display) languages. To change the language:
- Go to "Settings" > "System" > "Languages & input".
- Select "Languages" and then "Add a language" to choose your preferred language.

Figure 5.7: Language Settings Navigation.
5.8 Button Light Customization
Customize the color of the physical buttons on the headunit to match your vehicle's interior or your personal preference. Access this setting in the system's display or general settings menu.

Figure 5.8: Customizable Button Lights.
5.9 Steering Wheel Control (SWC)
The headunit supports digital steering wheel controls, allowing you to manage music playback and hands-free calling directly from your steering wheel for safer driving.

Figure 5.9: Steering Wheel Control Functionality.
5.10 Bluetooth Functionality
Connect your smartphone via Bluetooth for hands-free calling, audio streaming, and contact synchronization. Access Bluetooth settings from the main menu to pair devices.

Figure 5.10: Bluetooth Interface.
5.11 Optional Features
Your headunit supports various optional accessories to enhance functionality:
- **AHD Reversing Video**: Provides clearer rear-view video than ordinary cameras.
- **ADAS DVR**: Anti-collision warning driving recorder with front vehicle distance prediction, anti-collision warning, and lane departure warning.
- **DAB+ Radio**: For EU buyers, an optional DAB+ dongle can provide better sound quality and stronger signal for digital radio.
- **OBD II**: On-board diagnostics to diagnose your car's status anytime.
- **TPMS**: Tire Pressure Monitoring System sensors automatically monitor tire pressure and temperature.

Figure 5.11: AHD Reversing Video.

Figure 5.12: ADAS DVR Functionality.

Figure 5.13: OBD II Support.

Figure 5.14: TPMS Support.
6. Maintenance
6.1 Cleaning the Display
Use a soft, lint-free cloth to gently wipe the screen. For stubborn smudges, slightly dampen the cloth with water or a screen-safe cleaner. Avoid abrasive materials or harsh chemicals.
6.2 Software Updates
Periodically check for software updates to ensure optimal performance and access to new features. Updates can typically be found in the system settings or by contacting customer support.
6.3 General Care
- Avoid exposing the unit to extreme temperatures or direct sunlight for prolonged periods.
- Do not attempt to disassemble the unit yourself. Refer to qualified service personnel for repairs.
- Ensure all cables are securely connected to prevent intermittent issues.
7. Troubleshooting
This section addresses common issues you might encounter. If you experience problems not covered here, please contact customer support.
| Problem | Possible Cause / Solution |
|---|---|
| Unit does not power on. | Check power connections and vehicle's fuse box. Ensure the vehicle battery is properly connected. |
| No sound. | Check speaker wiring, volume level, and audio output settings. Ensure the correct audio source is selected. |
| Touch screen unresponsive. | Restart the unit. If the problem persists, contact support. |
| GPS signal weak or inaccurate. | Ensure the GPS antenna is properly installed and has a clear view of the sky. |
| CarPlay/Android Auto not connecting. | For CarPlay, ensure Bluetooth is connected. For Android Auto, ensure a proper USB cable is used and the "ZLINK" app is open. Check phone settings for permissions. |
8. User Tips
- **Easy Installation**: The unit features a "plug and play" interface, making installation straightforward for those with basic car audio knowledge. However, professional installation is always recommended to prevent damage.
- **Rich Functionality**: This headunit offers a wide range of features including MP3 playback, charging capabilities, built-in GPS, 3G/4G network support, WiFi, mobile phone integration, built-in speaker/microphone, CAN-Bus support, and steering wheel control.
- **Display Size**: The unit typically features an 8.8-inch display, with some models like the M90S offering a 9-inch screen, providing ample space for navigation and multimedia.
9. Warranty and Support
9.1 Manufacturer's Warranty
This product comes with a 12-month manufacturer's limited warranty for defective items, excluding items damaged or misused after receipt. Accessories typically come with a 3-month warranty.
Defective items must be reported and returned within the warranty period, in their original packaging if possible. You must provide the defect description and your order number. The manufacturer does not repair or replace items with an expired warranty.

Figure 9.1: Warranty Details.
9.2 365 Days Free Replacement
In addition to the standard warranty, a 365-day free replacement policy may apply under specific terms and conditions. This typically involves contacting the seller, confirming quality problems, returning the item, and the seller receiving the return before sending a new one.

Figure 9.2: 365 Days Free Replacement Process.
9.3 Customer Service
For any issues, questions, or support needs, please contact the seller directly. Providing your order number and a clear description of the problem will help expedite the support process.
