The Mercedes-Benz ML350 high beam and low beam headlight bulbs utilize D1S, H7, and D2S sizes depending on production specifications. The replacement chart covers 2003 through 2015 model years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H7 bulb is the most widely specified type across the Mercedes-Benz ML350 headlight data, appearing in both high beam and low beam positions across the 2003-2015 model years. It is a single-filament halogen bulb rated at 12V and 55W, fitted with a PX26d base, and carries ECE approval for use in Europe and worldwide, with additional approval in the United States and Japan.
The D1S and D2S bulbs are both HID (xenon) discharge types rated at 85V and 35W, designed exclusively for projector-type housings. The key distinction between them is that the D1S incorporates an integral ignitor within the bulb itself, while the D2S requires a separate external ignitor. These two types are not interchangeable despite sharing the same wattage and voltage ratings.
In the low beam position, the Mercedes-Benz ML350 used the D2S bulb for HID-equipped vehicles from 2003-2007, after which the specification shifted to the D1S for 2008-2015. Because the D2S uses a P32d-2 base and the D1S uses a PK32d-2 base, bulbs from these two groups are physically incompatible with each other's housings.
For the high beam position, HID fitment is listed only for 2012-2015, where the D1S is specified. In contrast, the low beam position carried HID options as far back as 2003, indicating that HID technology was applied to the two beam positions at different points across the production span.
From 2012-2015, the ML350 high beam position lists both D1S and H7 as valid specifications, reflecting two distinct headlamp system configurations available on the vehicle. Substituting one bulb type for the other is not supported, as each corresponds to a different and incompatible headlamp housing design.
For the 2003-2010 model years, the high beam position lists only the H7, regardless of whether the vehicle was equipped with HID low beams. This indicates that HID technology in those years was applied solely to the low beam circuit, with halogen retained for high beam output.