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Chapter 3: VML750 Troubleshooting Causes and Indicators
LED Indications
This table describes the functions of the LED indicators on the VML750 LTE Vehicular Subscriber
Modem (VSM) front panel.
Table 5 LED Indicators Function
LED Name
Power LAN
WWAN1
WWAN2
WiFi
GPS
LED Status
OFF Power off No link
Off
Off Off Off
Solid Green
Power on Link is on
Connected
Connected
Available
Tracking
(for AP)
Connected
(for client)
Blinking
Powering up TX/RX Activity
Connecting/
Connecting/
TX/RX
Green
Registering
Registering
Activity
(for AP)
Scanning
(for client)
Solid
Orange
Blinking
Orange
No Ignition Searching for Searching for Searching
for
The user
signal
signal
signal
turns on the
power (power
button pressed)
ignition is off
Solid Red
Problem/ Over-
Problem/
Problem/
Problem
heat
Overheat
Overheat
Blinking Red
Standby
SIM card is not
SIM card is not
External power
installed in the
installed in the
is connected
modem
modem
to the system
Rapid
Problem
SIM door is
SIM door is
Blinking Red
open
open