5. Check if the OBU light is green 

OBU showing a green light? You may start to drive!
OBU showing a red light? Call our Customer support!*

Important: to show a green light, the OBU must be correctly coupled to the vehicle (the licence plate, Gross Combination Weight Rating and EURO Emission Class specified must correspond to the values specified in the vehicle papers you have submitted).

00800 72 83 55 42 (free from Belgium and neighbouring countries)
  +32 2 416 0 416 (from any location)
Calls from mobile networks may be surcharged according to the terms and conditions of your mobile service operator.