Maserati GranTurismo high beam and low beam headlight bulbs both use D1S size bulbs. The replacement bulb size chart covers 2008 through 2019 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Maserati GranTurismo uses the D1S bulb type for both high beam and low beam headlights across the 2008-2019 model years.
The D1S is a discharge bulb, meaning it operates on a high-voltage ignition system rather than a standard filament, and requires a compatible ballast to function.
The "D1" designation indicates the bulb has an integrated igniter built into the base, distinguishing it from D2-series bulbs, which use a separate external igniter.
The "S" suffix in D1S denotes a single-beam output, meaning each bulb produces one beam pattern, which is why the GranTurismo requires separate bulbs for high and low beam functions despite both positions sharing the same bulb type.
D1S bulbs produce light through a xenon gas arc and are commonly rated at 35 watts, generating a color temperature typically between 4200K and 4500K in standard form, which produces a white light with a slight blue tint.
Because both beam positions on the Maserati GranTurismo (2008-2019) share the D1S specification, the same replacement bulb part number applies to both the high beam and low beam sockets.
D1S bulbs are not interchangeable with D2S, D3S, or D4S types without modification, as each series has a distinct base configuration and voltage requirement.
The consistent use of D1S across all twelve model years covered in the specifications indicates no bulb type revision occurred within this production span for either beam position.