8. Blown fuse. In rare cases, a blown fuse could also be the culprit in the breakdown of your S-Max. Check all fuses in the fuse box essential for starting the engine. But, be careful when lending a hand yourself to the fuse box! The box is under power and repairs or tests should always be done in a workshop. 9. Defective spark plugs This is a demo to show you how to find the ACC 12V+ location in your fuse box when you install a set of iJDMTOY direct fit LED daytime running lights. Check r3vKa.