Maserati Quattroporte Headlight Bulb Size

Additional Notes

• The D3S bulb is the most frequently specified type across the Maserati Quattroporte headlight data, appearing in both high beam and low beam positions for the 2013-2017 model years. It is a mercury-free HID xenon discharge bulb operating at 42V and 35W, built to ECE standards, and features a PK32d-5 base with an integral ignitor designed for projector-type housings.
• The D1S bulb covers both high beam and low beam positions for the 2009-2012 model years. Like the D3S, it is an ECE-standard HID xenon unit with an integral ignitor for projector-type housings, but it operates at a significantly higher voltage of 85V while sharing the same 35W wattage. Its base type is PK32d-2, which is physically distinct from the PK32d-5 base of the D3S, making the two types non-interchangeable.
• The D2S bulb, specified for high beam use on the 2004-2007 Quattroporte and also for the 2008 model year with halogen headlamps, shares the 85V, 35W operating characteristics of the D1S but uses a P32d-2 base and requires an external ignitor rather than an integral one. This external ignitor requirement is a key fitment distinction from both the D1S and D3S.
• The 2008 Maserati Quattroporte carries dual high beam specifications depending on headlamp type: D1S for HID headlamp configurations and D2S for halogen headlamp configurations. These two bulb types are not interchangeable due to differing base designs and ignitor arrangements, so the installed headlamp system determines which bulb applies.
• The 2009 Quattroporte similarly carries dual low beam specifications, with D1S listed for HID headlamp configurations and H3 listed for halogen headlamp configurations. The H3 is a single-filament halogen bulb with a PK22s base, operating at 12V and 55W, and is approved under ECE, US, and Japanese standards.
• The H3 bulb appears as the low beam specification for the 2004-2007 model years as well as the 2009 halogen variant. At 12V and 55W, it operates on a conventional halogen principle rather than the high-intensity discharge process used by the D-series bulbs, representing a fundamentally different light-generation technology within the same vehicle lineage.
• The 1984-1986 Quattroporte uses ANSI-standard sealed beam units rather than replaceable bulbs. The H4651 serves as the high beam unit across all three years, while the low beam uses H4652 for 1985-1986 and H4656 for 1984. All three are 4x6-inch rectangular sealed beam units operating at 12V, and in each case the entire housing unit is replaced rather than an individual bulb.
• The shift from ANSI sealed beam units in the 1984-1986 years to ECE-standard replaceable bulbs in the 2004 and later years reflects a change in headlamp construction type. Sealed beam units integrate the lens, reflector, and filament into a single non-serviceable assembly, whereas the D-series and H3 bulbs are discrete components installed into separate housings.