FOR TRUCKS
Turn the ignition ON:
If the Warning Lamp goes ON/OFF then that is your sequence (number 1. above )
If the lamp stays ON, drive the truck above 7kph. If the warning lamp in the cab then goes OFF, your sequence is number 2. above
If the warning lamp stays on after the vehicle has exceeded 7kph, it means there is a fault in the ABS system (number 3. above), which should be fixed before driving further