What do the lights on the LD25-V01 mean?
The LD25-V01 has two LED lights: an amber LED light to indicate cellular activity and a green LED light to indicate GPS
activity. When these LEDs flash that could refer to a few different actions. Here is the LED light behavior to expect with the LD25-V01:
| Cellular | GPS | |
| LED Color | Amber | Green |
| Off | Modem off | GPS off |
| On | Modem on, and connected to network | GPS fixed to vehicle's location |
| Medium Flashing | Searching for cellular network | Searching for satellites |
| Fast Flashing | Transferring cellular data | Receiving GPS location |
| Slow Flashing | Error, see next FAQ for details | Error, See next FAQ for details |
How can I tell if a LD25-V01 is not working?
When a LD25-V01 is flashing slowly, that could mean it is encountering an error. Here are the specific issues that can be encountered with with LD25-V01 and how its LED lights will communicate it:
| LED | Color | Flash (Slow) Count | Error |
| Cellular | Amber | 1 | SIM Error |
| 2 | No network | ||
| 3 | Unable to register with network | ||
| 4 | Battery too low to transmit | ||
| 5 | Service activation error | ||
| 6 | Service sync failure | ||
| GPS | Green | 3 | GPS unable to fix location |
How long should it take for all LEDs go out after turning the engine off?
There is a Bluetooth icon on the LD25-V01 label. Is Bluetooth functionality supported?
Under the LD25-V01's label there is a red light that occasionally flashes. Is this related to a feature of the LD25-V01?
The side of the LD25-V01 has an 8-Pin Serial port. Does this TCU support external hardware?
The LD25-V01 is installed, but Ground Traffic Control is not receiving any path data.
Possible reasons:
- The asset was not created in Ground Traffic Control before installation, and the data is instead showing on an auto-created asset.
- During installation, the vehicle engine turned off or the vehicle moved before both LEDs turned solid.
- The vehicle was not driven after both LEDs turned solid.
- The vehicle is 2007 or older and is not compatible with the LD25-V01.
Ground Traffic Control is missing certain data immediately after installation.
When the Zonar LD25-V01 is installed, it must download and process software updates which may interfere with data collection. Data after 24 hours should be correct.
The IMEI/GPS ID on the device is not present in Ground Traffic Control.
The label on the device may include a leading 0 in the IMEI (for example, 016350004027976) that is not present in the same ID in Ground Traffic Control (for example, 16350004027976). When searching for the ID, make sure to drop the leading 0.
The Phone Home date is much older than active GPS data in Ground Traffic Control, which is unusual compared to V3s and V4s.
The Zonar LD25-V01 sends a phone home heartbeat every 4 hours starting at power-off. If the reported phone homes are much older than that perform a check of the LD25-V01's LED lights while the vehicle's engine is running. Common causes include:
- The vehicle battery is discharged.
- The vehicle is not in an area with strong cellular coverage.
- The device has become disconnected from OBDII port or Y-Splitter cable.
If LED check does not reveal the issue, contact Zonar support at (877) 843 3847 #1.
The device was working, but is no longer sending data, or is sending unusual data.
Perform a check of the LD25-V01's LED lights while the vehicle's engine is running. If LED lights are active and no data is present contact Zonar Support at (877) 843 3847 #1.
My Ford vehicle is experiencing FordPass® functionality issues.
In some cases, LD25-V01 may interfere with FordPass® functionality (for example, remote start and remote door unlock may not function while LD25-V01 is installed). Full functionality is restored when LD25-V01 is removed. If any required FordPass® features are not working on a specific vehicle, Zonar recommends using a Zonar V4 TCU with 4-pin connector on the specific vehicle.
Using a V4 + 4-pin connector does not provide ECM odometer or DTC functionality.
Contact Zonar Support at (877) 843 3847 #1 if your issue is not listed here, or if the remedies described have been tried with no success.