After this initial test has been completed

How the warning lamp works

The warning lamp is controlled by the electronic control unit (ECU) fitted to the vehicle. When the ignition is turned ON, the ECU checks the external components to make sure they are working correctly. After this initial test has been completed, some ABS systems will turn the warning lamp OFF, and it will then only reappear if a fault is detected once the vehicle is moving (faster than 7kph). If the warning lamp stays ON when the vehicle is stationary it may indicate a fault, alternatively it could be that the ECU is waiting to receive the correct wheel speed signals from the ABS sensors. Once this happens from all the ABS sensors fitted to the vehicle, the Warning Lamp will go OFF.

One thing all ABS systems have in common, is that the warning lamp should go OFF when the vehicle is driven avove 7kph. If the vehicle lamp stays ON above this speed, it means there is a fault in the system. NB - some electronic dashboards do not show a warning lamp until a fault appears.