Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your RYSJM C3 Plus Car HUD (Head-Up Display). This device enhances your driving experience by projecting essential vehicle data and navigation information directly onto your windshield, allowing you to keep your eyes on the road.
Important Note on Compatibility:
The OBD HUD is generally suitable for cars manufactured after 2008. Please verify compatibility with your vehicle's model year before installation. If your vehicle's voltage is higher than 24V, please use a USB cable for GPS mode operation instead of the OBD connection.
Package Contents
Please check the package for the following items:
- C3 Head Up Display Unit
- Cigarette Lighter Cable
- OBD Cable
- English Manual
- Cleaning Cloth

Setup and Installation
Follow these steps to install your C3 Plus Car HUD:
- **Connect Power**: Plug the OBD cable into your car's OBD2 socket connector. Alternatively, you can use the cigarette lighter cable for power, especially if your car's voltage is above 24V.
- **Route Cable**: Carefully route the cable along the A-pillar seal to conceal it and prevent interference with driving.
- **Position HUD**: Connect the other end of the OBD interface to the HUD unit. Place the HUD unit on your dashboard in a position that provides a clear view of the projected display without obstructing your view of the road.

For a visual guide, please watch the installation video below:
Operating Instructions
Power On/Off
The HUD features an automatic switch function. It will automatically turn on when your car starts and turn off when your car stops, ensuring convenient operation and energy saving.

Dual System Operation (OBD+GPS)
The C3 Plus HUD operates on a dual system, combining OBD2 data and GPS satellite data for comprehensive information display. This makes it suitable for a wide range of car models.
Main Functions and Display Modes
The HUD offers a variety of functions and customizable display interfaces:
- **OBD2 Mode Data**: Speed, RPM, Water Temperature, Battery Voltage, Clock, Driving Time, Driving Distance, Fuel Consumption, Altitude, Satellite Numbers, Turbine Pressure, Air-Fuel Ratio, Intake Pressure, KM/H, MPH, Data Stream.
- **GPS Mode Data**: Speed, Driving Time, Driving Distance, Satellite Numbers, Data Stream.
- **Navigation (C3 Plus Navigation Model Only)**: Displays driving direction and navigation arrows. This feature requires mobile device interconnection.
- **Multiple Interface Options**: Customize your dashboard content with over 100 small interface combinations.
- **Color Customization**: Change display colors to suit your preference.



Adjustable Angle Design
The HUD features an adjustable angle design, allowing you to set it to your comfortable driving angle for optimal visibility.
Automatic Light Sensitivity
The built-in light sensor automatically adjusts screen brightness according to the current environment (day, night, cloudy, rainy). It offers 18 levels of brightness adjustment for a soft and bright display in dark conditions without flicker.
Menu Navigation and Settings
The HUD features a stereo button design for easy one-button operation. You can access various settings and options through the menu:
- **Main Menu Options**: Setting, OBD Diagnose, Driving test, Data Stream, Return, Language Set, Sound Switch, Speed Alarm, Coolant Alarm, RPM Alarm, BAT Alarm, Speed adjust, Speed offset, BAT Adjust, Engine Size, Fuel adjust, Change color 1/2/3, Brightness, CWT Unit, Speed unit, Sum Distance, Power off time, Sleep voltage, Time adjust, Factory set.


Maintenance
To ensure the longevity and clear display of your HUD, use the provided cleaning cloth to gently wipe the screen and unit. Avoid using harsh chemicals or abrasive materials that could damage the surface.
Troubleshooting and Alarms
Multi-Alarms
The C3 Plus HUD provides multiple alarms to alert you to potential issues and enhance driving safety:
- **Speed Alarm**: Alerts when speed reaches a set default value (e.g., 6000r/min, setting range 1000-8000).
- **Speeding Reminder**: Alerts when speed exceeds a set default value (e.g., 150KM/h, setting range 5-200km/h). Speed display color changes: 0-99 White, 100-119 Yellow for reminder, 120+ Red for alarm.
- **RPM Alarm**: Alerts for high engine RPM.
- **Water Temperature Alarm**: Alerts when water temperature reaches a set default value (e.g., 120°C).
- **Voltage Alarm**: Alerts when voltage is lower than a set default value (e.g., 10.0-15.0V).
- **DTCS Alarm**: Alerts for Diagnostic Trouble Codes.
- **Fatigue Driving Reminder**: Prompts you to take a break during long drives.
- **Engine Failure Alarm**: Indicates potential engine issues.


Car Data Scanning and Diagnosis
The HUD can perform car data scanning and depth detection diagnosis, allowing you to read and clear Diagnostic Trouble Codes (DTCS) for a comprehensive check-up of your car.

The device can read a wide range of data parameters from your vehicle's OBD system:

Specifications
| Feature | Description |
|---|---|
| Brand Name | RYSJM |
| Model | C3 Plus (Available in Navigation and Non-Navigation versions) |
| Rated Power | OBD2 +GPS |
| Output Frequency | 0 |
| Size Name | 11*8*5cm (approximate) |
| Wire or Wireless | Wire (OBD2 connection) |
| Material | ABS |
| Display Channel | HD LCD Display |
| Optical Imaging | Suspended virtual display, free-form surface technology, 10 multi-layer optical coating, no ghosting. |
| Thermal Design | Fanless multi-position air thermal design (no noise, super energy saving, high reliability). |
| Working Voltage | 11V~18VDC (12vdc/200ma) for OBD mode. Use USB for GPS mode if voltage > 24V. |



User Tips
- **OBD2 Compatibility**: While the HUD is generally compatible with cars manufactured after 2008, it's always recommended to confirm compatibility for your specific vehicle model.
- **Power Source for High Voltage Vehicles**: If your car operates at a voltage higher than 24V, ensure you use the provided USB cable for GPS mode to prevent damage to the device.
- **Navigation Setup**: For the C3 Plus Navigation model, ensure your mobile device is properly interconnected to utilize the live navigation features.
- **Display Clarity**: Adjust the HUD's angle and brightness settings to achieve the clearest and most comfortable view for your driving position and ambient light conditions.
Warranty and Support
For any technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact the RYSJM Official Store customer support. Ensure you have your product model and purchase details ready for faster service.





