ATG - Eps Testing system Mode D'emploi Et Entretien page 10

Power steering parts
Click the 'ON' button in the 'Power supply' box. The green light comes on and the main relay is engaged.
If there is not main DC voltage at all, because of fuses, main switch, battery etc, will appear the following window with error message
(Main DC voltage not present):
ATG - Eps Testing system