This guide explains the meaning of the indicator lights on asset telematics hardware devices used for tracking and data communication within the T3 system. Each light corresponds to a different status, such as power, GPS, or cellular connectivity.
CalAmp 3030 / 3035 Devices
Power (Red LED)
LED | Behavior | Description |
Red | On | Device has power. |
Red | Off | Device is running normally. |
Cellular (Yellow LED)
LED | Behavior | Description |
Yellow | Blinking | Searching for cellular signal. |
Yellow | Solid | Cellular signal acquired. |
GPS (Green LED)
LED | Behavior | Description |
Green | Blinking | Searching for GPS signal. |
Green | Solid | GPS signal acquired. |
CalAmp 2830 Device
Cellular (Yellow LED)
LED | Behavior | Description |
Yellow | Blinking | Searching for cellular signal. |
Yellow | Solid | Cellular signal acquired. |
GPS (Green LED)
LED | Behavior | Description |
Green | Blinking | Searching for GPS signal. |
Green | Solid | GPS signal acquired. |
MC-4+ Device
Power & Charging (Red LED)
LED | Behavior | Description |
Red | Solid | Device has power. |
Red | Slow Blink | Internal battery is charging. |
Red | Fast Blink | Internal battery charger is faulty. |
GPS (Yellow LED)
LED | Behavior | Description |
Yellow | Slow Blink | Searching for GPS fix. |
Yellow | Solid | GPS fix acquired. |
Cellular (Green LED)
LED | Behavior | Description |
Green | Fast Blink | Searching for cellular signal. |
Green | Solid | Cellular signal acquired or signal is sufficient. |
Green | Continued Fast Blink | Signal strength inadequate. |
Pairing / Bus Test (Blue LED)
LED | Behavior | Description |
Blue | Slow Blink | Device unpaired or starting vehicle bus test. |
Blue | Fast Blink | Vehicle bus test failed. |
Blue | Solid | Device paired or vehicle bus test passed. |
Installation Tip:
Ensure all lights are steady in their final states before beginning regular operation.
MC-3 Device
Power (Red LED)
LED | Behavior | Description |
Red | Solid | Device has power. |
GPS (Yellow LED)
LED | Behavior | Description |
Yellow | Blinking | Searching for GPS signal. |
Yellow | Solid | GPS signal acquired. |
Cellular (Green LED)
LED | Behavior | Description |
Green | Blinking | Searching for cellular signal. |
Green | Solid | Cellular signal acquired. |
Green | Fast Blink | Signal strength inadequate. |
Installation Mode (Blue LED)
LED | Behavior | Description |
Blue | Blinking Only | No data being pulled. |
Blue | Solid | Data transmission active. |
Installation Notes:
After the initial sequence, lights may briefly turn off before resuming.
Watch for the blue–yellow–green blinking pattern.
Allow yellow and green lights to turn solid before powering down.
Upon vehicle restart, red, yellow, and green lights should remain solid.
MCX101 / MCX1M1 Device
Navigation LED
LED | Behavior | Description |
— | Off | Sleep mode or device malfunction. |
— | Blink Every Second | Normal operation; GNSS signal active. |
— | Solid | No GNSS signal. |
— | Fast Blink | Device firmware update in progress. |
Status LED
LED | Behavior | Description |
— | Off | Boot mode or device malfunction. |
— | Blink Every Second | Normal operation. |
— | Blink Every 2 Seconds | Sleep mode (power-saving). |
— | Fast Blink (Short) | Modem communication active. |
Operational Notes:
The device checks in every 12 hours (ignition off) or every 10 minutes (ignition on).
It enters sleep mode when idle and resumes normal mode upon movement or ignition.
FJ2500 Device
Depleted Internal Battery
LED | Behavior | Description |
Yellow | Slow Flash (1/sec) | Cell modem initializing. |
Yellow | Rapid Flash (3/sec) | Establishing cellular connection. |
Green | Slow Flash (2/sec) | GPS modem initializing. |
Yellow | Solid | Cell connection established. |
Green | Solid (after 1 min) | GPS connection established. |
Charged Internal Battery
Same as above, excluding the initial slow yellow flash.
Power Protect Mode
Same LED behaviors as in the Depleted Battery state.
Note:
If the green LED doesn’t turn solid after 1 minute, turn on the ignition for an additional minute. If still unresolved, contact T3 Support.
Queclink GL500 / GL520 Devices
Action | LED Behavior | Description |
Press & release (<2 sec) | Blue & Green Solid | Device powered on. |
Hold & release (>2 sec) | Blue & Green Alternating | Device is powering on. |
Hold & release (<2 sec) again | Blue & Green Rapid Flash | Device is attempting to send an SOS message. |
PT40 Device
GPS
LED | Behavior | Description |
Orange | Off | GPS power management engaged. GPS is turned off. GPS backup clock is ON. |
Orange | Flashing | GPS is in acquisition mode. |
Orange | Solid | GPS signal is locked. |
Vehicle Connection
LED | Behavior | Description |
Green | Off | No vehicle connection active. |
Green | Flashing | Negotiating communication on the vehicle bus. |
Green | Solid | Connected and receiving data from the vehicle. |
Cellular
LED | Behavior | Description |
Blue | Off | Cellular subsystem is off. |
Blue | One Flash / 10s | Cellular subsystem not searching. |
Blue | Two Flashes / 10s | SIM card not detected. |
Blue | Fast Flash | Cellular network has rejected the device. |
Blue | Slow Flash | Cellular subsystem is searching. |
Blue | Solid | Cellular subsystem connected to a network. |
T3 Dash Cam
For information on T3 Dash Cam lights, see Understanding the T3 Dash LED Icons for Troubleshooting.