This article will help you troubleshoot issues with your vehicle tracker, including what the different LED lights mean, how to reset a device with no lights, and what to do if your tracker still isn't responding. These steps can help reduce downtime and ensure your fleet stays visible and trackable in Commusoft.
LED Indicators Overview
Each tracker has two LED lights: Navigation and Status. Both should blink every second during normal operation.
Navigation LED
LED Behaviour | Meaning |
Permanently switched on | GNSS signal is not received |
Blinking every second | GNSS is working normally |
Off | GNSS is off because the device is not working or is in sleep mode |
Status LED
LED Behaviour | Meaning |
Blinking every second | Device is in normal mode |
Blinking every two seconds | Device is in sleep mode |
Blinking fast for a short time | Device is showing modem activity |
Off | Device is either off or in boot mode |
Manufacturer Installation Guides
If your trackers are in remote locations, strange positions or just installed incorrectly this can affect their usage.
2G Hard Wired (FMB920)
4G Hard Wired (FMC920)
2G Self Installed (FMB001)
4G Self Installed (FMC001)
💭 My device has no lights — what should I do?
If your Wireless Self-Installed tracker shows no lights at all, follow these steps to check the installation:
Remove the plug-in tracker from the vehicle.
Open the tracker case.
Remove the pins connecting the battery to the green board — wait 20 seconds.
Plug the pins back into the green board.
Close the tracker case.
Plug the tracker back in and wait 5 minutes. Both LEDs should blink every second.
Try connecting the tracker to a different vehicle’s OBD2 port.
We no longer support the old O2 sim cards, if you have these and the device stops working we will require you to update to our new Truphone sim card or potetinally purchase a new device.
The steps didn’t work — what do I do next?
Please provide the following to our support team:
The Commusoft username of the affected user.
The IMEI number of the tracker.
A 10-second video showing the device and its lights.
A brief summary of the steps you've already tried.
We will help diagnose and support you with issues that arise, however, we will not always be able to remotely fix issues with trackers and may at times request they are returned to us for diagnosis. Ensure you send any devices back to us via a tracked and insured method as you are responsible for any lost items - Only send them back if advised to by our service team.