Did you start with a bulb? You have the bulb and the ballast...box under the headlight...Start with a bulb...If that doesn't work try another ballast...A lot of manufactures don't sell just the ballast...Get the number off the old ballast and match it up with a used unit off Ebay..A lot of makes use the same ballast...The ECU is the headlamp leveling ECU, but that is not your problem if the light won't come on...Jason

 

Jason, I wish I was a little closer to you. I tried bulb first. I tried buying a assembly used hoping to get good ballast. Neither has helped. The number on the ballast must be 2013 to 2018 only. I bought one with one number difference. it also fits Cadillac DTS so I gave it to my brother because his go bad often. Plug in the back is different. So it must be priority Maserati. I checked Scuderia Parts and no part without complete light assembly. I'm in Nashville and the dealer here is a customer of mine but I get no breaks and I hate to pay a tech that doesn't know anymore than I do.

 

Agree with Jason. Change bulb first, then ballast. I doubt ECU is faulty or you will get a message on dashboard about "adaptive headlight malfunction". The ballast location is very bad at the bottom of the light housing. It collects water as there is a gap (painted) near the top middle of the black light housing that allows water to flow down. I had rain water damaged the entire light assembly once. Insurance covered but I sealed that little gap with epoxy since....such a stupid design...my gosh! If you were getting intermittent lighting off and on before it went bad, then more than likely faulty ballast.

 

You can find the 2013-18 ballast on Ebay or online stores. New is about $400. You don't need to buy the entire light assembly. I have changed the ballast in past...

 

You can find the part number attached from my 2013. My mechanic put a new ballast but still had an "adaptive light malfunction" light on dashboard cause the motor inside light housing for leveling was damaged from rain water...so Insurance put new light assembly. Remove tire and peel back liner....3 big screws for housing and 3 small screws for ballast...not difficult but remove light housing slowly.

 

I bought this one on eBay. The one you show has different part #. That may help I’ll do some searching for that part #

 

I forgot my idiot light use to come on once in a while and now it doesn't.

 

Here is a picture of the bad ballast (passenger side) that came out of my 2013 GT. It was soaked with water at the bottom (electrical connections) from the rain....