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Product Overview
The Car Head Up Display (Navigation Version) (C3-BT) projects key vehicle and driving data into your forward view so you can check information without looking down at the dashboard. This guide is based strictly on the official documentation for the Car Head Up Display (Navigation Version) (C3-BT). It can show items such as speed, RPM, coolant temperature, voltage, and trip distance.
For drivers who want a quick glance display for everyday driving, the C3-BT supports both OBD2-based vehicle data and a GPS-based display mode when OBD mode is unavailable. It also supports app-based navigation through a phone connection, which can be useful when you prefer turn guidance on the HUD while keeping the phone out of your main sightline.
Best suited for:
- OBD2/EOBD vehicles where you want dashboard-style data like speed, RPM, and engine temperature visible on the HUD.
- Drivers who need a fallback display mode by switching to GPS when OBD mode cannot connect.
- Users who want basic navigation via the WiiYii app with Bluetooth pairing and phone location enabled.
Consider alternatives if:
- Your vehicle does not support OBD2/EOBD protocols, since OBD2 mode is limited to those vehicles.
- You need guaranteed high-precision navigation at all times, since GPS positioning can drift when signal is weak.
The documentation emphasizes a practical setup detail that is easy to miss: if OBD mode will not work on your vehicle, switching to GPS mode is the intended workaround, and the switch must be done immediately after power-up.
Safety Warnings
Use the C3-BT safely by following the electrical and usage cautions in the official documentation. These warnings help prevent device damage, unexpected battery drain, or unreliable operation while driving.
- Warning: Electrical hazard and device damage risk. OBD2 mode is designed for 5V-18VDC operation (typical 12V, about 200mA). If vehicle voltage is higher than 24V, use a USB cable and run GPS mode instead.
- Driving safety risk. Configure and adjust settings while parked, then confirm the display is stable before driving.
- Battery drain risk. If the vehicle will not be used for more than one week, unplug the device as recommended in the documentation.
Installation Instructions
To install the C3-BT, connect it to vehicle power through the OBD port or a USB power source, then select the correct system mode so the display shows data reliably. The official instructions focus on securing a tight cable connection and choosing GPS mode when OBD mode is unavailable. Completing these steps first prevents blank screens and connection errors later.
- Connect the HUD to the vehicle using the OBD cable so the plug is fully seated. A tight connection matters because a loose plug can cause no power or missing data.
- If your vehicle environment requires it, power the HUD via USB (for example, through a cigarette-lighter USB power source) to use GPS mode. This is the documented alternative when OBD mode is not available or not supported.
- Right after powering on, select the correct system mode. If you need GPS mode, short press > within about 5 seconds after power-up to select the GPS system as described in the documentation.
- Confirm the HUD display is active and readable before driving. This check ensures the device is receiving data (OBD mode) or satellites (GPS mode) as expected.
Tip: If the HUD powers on but does not show driving data, switch to GPS mode first, then revisit OBD mode only after confirming your vehicle supports OBD2/EOBD.
How to Use Car Head Up Display (Navigation Version) (C3-BT)
To use the Car Head Up Display (Navigation Version) (C3-BT), power it through OBD or USB, choose OBD or GPS mode, then use the front buttons to switch screens and adjust settings. The HUD shows driving information like speed and voltage, and it can pair with the WiiYii app for navigation when your phone Bluetooth and location services are enabled.
Button controls for daily operation
The C3-BT uses short presses for quick actions and longer presses for deeper settings. Learning the button behavior helps you change displays without guessing, which reduces distraction while driving.
- Power: Long press to turn off, and long press again to turn on.
- < (short press): Choose language and system, switch functions in the right-side area, and act as menu/parameter +.
- > (short press): Choose language and system, switch functions in the left-side area, and act as menu/parameter –.
- M (short press): Switch functions and switch display layouts.
- M (long press): Enter settings, then save and exit after adjustments.
Entering settings and saving changes
Settings are changed through the menu so you can tailor alarms, units, and calibration to match your vehicle and preferences. Saving correctly matters because changes are only kept after the documented save-and-exit action.
Press M to enter a setting item, use > to select a menu item, and short press M to confirm. Long press M for about 2 seconds to save and exit.
Core settings you may actually need
The documentation includes several settings that affect real-world readability and accuracy. Adjust only what you need so you can keep the HUD consistent with your dashboard and driving habits.
- Language: Select CN, TW, or EN.
- Sound switch: Turn the buzzer ON or OFF.
- Overspeed warning: Set the speed that triggers the alarm.
- Engine temperature alarm and engine speed alarm: Set thresholds that match your vehicle safety expectations.
- Voltage alarm: Set a low-voltage alert so you notice electrical issues early.
- Brightness: Use auto light sensing or manual levels from 1 (darkest) to 8 (brightest).
- Units: Choose Km/h or MPH, and temperature in C or F.
Accuracy adjustments for speed and voltage
If your HUD readings differ from your dashboard, the documentation provides calibration options. These adjustments matter because mismatched speed or voltage readings can lead to incorrect alerts and confusing data while driving.
- Speed adjustment: Fine-tune when HUD speed does not match the instrument cluster.
- Speed zero: Correct a speed that does not return to 0 when the vehicle stops.
- Voltage adjustment: Fine-tune if the HUD voltage differs from the instrument panel voltage.
Fuel consumption and displacement setup
Fuel readings depend on correct engine displacement and optional fine-tuning. Setting displacement matters because the HUD uses that value to interpret fuel data from the vehicle computer.
- Engine displacement: Set to your vehicle engine size if fuel consumption appears inaccurate.
- Fuel consumption fine-tuning: Adjust only if there is a consistent error, and note the documentation suggests fine-tuning can be optional because the value comes from the car computer.
Using driving tests and OBD diagnostic options
The C3-BT includes menu options for performance checks and basic OBD diagnostics. These features help you observe acceleration or braking performance and view fault-related information directly from the vehicle interface.
- Acceleration test: Measures the time for 0 to 100 km/h as a basic power reference.
- Brake test: Measures time and distance after speed is above 60 to reflect braking performance.
- Scan fault codes and clear fault codes: Read or clear codes through the HUD menu as described.
- Data stream: Displays engine data values available from the car system.
Pairing the WiiYii app for navigation
Navigation requires the phone app, Bluetooth pairing, and working location services. These prerequisites matter because the app depends on Bluetooth data transfer and GPS positioning to calculate and display routes.
- Install the WiiYii app. On iPhone, search for WiiYii in the App Store. On Android, search for WiiYii in the Android market, as described in the documentation.
- Turn on phone Bluetooth and location services, then open the app so it can search and connect to the HUD device.
- If the phone cannot connect, delete previously paired devices and bind to WYHUD, then retry after toggling Bluetooth or restarting the phone.
Technical Specifications
These specifications summarize the user-relevant electrical and configurable ranges stated in the official documentation, along with what they mean in day-to-day use.
| Specification | Value and practical meaning |
|---|---|
| OBD2 working voltage | 5V-18VDC (typical 12V vehicle power; use GPS/USB if vehicle voltage exceeds 24V). |
| Typical OBD2 current | 200mA (low draw, but unplugging is recommended for long non-use periods). |
| Overspeed warning range | 5-200 km/h (set a threshold that matches your driving and local limits). |
| Default overspeed alarm | 150 km/h (adjust if you need earlier alerts). |
| Engine temperature alarm range | 50-200 C (use to catch overheating conditions sooner). |
| Default engine temperature alarm | 120 C (a starting point for high-temperature alerts). |
| Engine speed alarm range | 1000-8000 r/min (use to avoid sustained over-rev driving). |
| Default engine speed alarm | 6000 r/min (adjust based on engine type and driving needs). |
| Voltage alarm range | 10.0-15.0 V (helps you notice low charging voltage early). |
| Default voltage alarm | 10.5V (an alert point for potential electrical issues). |
| Brightness levels | Auto or 1-8 (higher levels improve daytime visibility). |
| Units supported | Speed: Km/h or MPH; Temperature: C or F (match your dashboard and region). |
| Shutdown delay | Default 10 seconds; adjustable above 180 seconds (use longer delay if needed for vehicle behavior). |
Troubleshooting
If the C3-BT does not display data, will not connect, or behaves unexpectedly, start by confirming power, selecting the correct mode, and checking phone settings for navigation. The issues below come directly from the official FAQs and cover the most common connection, accuracy, and shutdown scenarios.
| Problem | Cause | Solution |
|---|---|---|
| No display and no power | Loose OBD connection or insufficient power from the source | Confirm the OBD cable is tightly connected and reseat it. If needed, power via USB in the cigarette lighter and use GPS mode. |
| Only voltage shows, then the HUD turns off after about 30 seconds | Vehicle protocol not supported in OBD2 mode (device requires OBDII/EOBD in OBD2 mode) | Switch to GPS mode using the USB cable. Short press > within about 5 seconds after power-up to select GPS. |
| HUD speed does not match the speedometer | Wrong unit selected or speed needs calibration | Verify Km/h versus MPH in settings. If the unit is correct, use speed adjustment in the menu to fine-tune the displayed value. |
| The device will not shut down after the engine stops | Shutdown voltage or delay does not match vehicle behavior, including auto start-stop systems | Adjust shutdown voltage to 13.2V or 13.6V, or set shutdown voltage to COM mode if applicable. Increase shutdown delay (for example, 300 seconds) if needed. |
| GPS mode shows no speed | Not enough satellites locked yet | Drive on an open road and allow time for satellite search. The documentation notes operation becomes normal when satellites reach 5 or more. |
| Bluetooth will not connect to the phone for navigation | Phone is paired to another device, HUD is not in a normal display state, or Bluetooth/location is not enabled | Ensure the HUD is displaying normally (switch to GPS mode if OBD is not connected). Delete existing paired devices, bind to WYHUD, toggle Bluetooth, and restart the phone if needed. |
| App connects, but you cannot enter a navigation address | Location services or network signal is off or weak | Turn on location services and enable network access. Move to an area with stronger signal, then try entering the address again. |
| Navigation guidance is off by about 10-20 meters | Normal GPS positioning error, especially with weak signal | The documentation notes GPS error can be about 5-10 meters and may reach 10-20 meters when signal is weak. Improve signal conditions when possible. |
Next Steps
After initial setup, review your unit settings (Km/h versus MPH, C versus F) and set alarms that match how you drive and what you want to be alerted about. If you plan to use navigation, install WiiYii, enable Bluetooth and location services, and confirm the phone can bind to WYHUD before relying on it for a trip. If you cannot resolve a problem using the documented FAQ fixes, use the manufacturer support channel referenced by your seller or packaging, since the manual focuses on common scenarios rather than full service procedures.
How do I connect the Car Head Up Display (Navigation Version) (C3-BT) to the WiiYii app?
Install WiiYii on your phone, turn on Bluetooth and location services, then open the app so it can search and connect to the HUD. If pairing fails, delete previously paired devices and bind to WYHUD, then toggle Bluetooth or restart the phone and try again.
Why does the HUD only show voltage and then shut off after about 30 seconds?
This typically happens when the vehicle is not supported for OBD2 mode, since the documentation limits OBD2 mode to OBDII and EOBD cars. Use the USB cable and switch to GPS mode by short pressing the > button within about 5 seconds after power-up.
Is it normal for navigation guidance to be off by 10 to 20 meters?
Yes. The documentation explains that GPS positioning error is typically about 5 to 10 meters, and it can appear as 10 to 20 meters when satellite signal is weak.
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