proceed as followings:
a)Check if the red LED is in constant glow. If the LED is dark, please
check the power connecting. If fuse is broken, please return the
device to the seller.
b)If the blue GSM LED is not in constant glow, please check the
installation of SIM card.
9.1.2 Please check the offline area in order to judge if the network problem of
operators.
9.2 When GPS cannot receive the signals, please drive in the open sky and
ensure there is no metal thins on the device.
9.3 When the device cannot receive the GSM signal, please check the SIM
card installation. If the GSM signals cannot reach your location (such as
the basement), please drive to the open sky.
9.4 The red LED is not glow when power on. Check the fuse of the power
line. If the fuse is fused, please change the fuse with the seller.