The Mercedes-Benz GLK350 uses high beam headlight bulbs in D1S, H15, and H7 sizes, along with low beam headlight bulbs in D1S and H7 sizes. The replacement chart covers 2010 to 2015 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The D1S is a high-intensity discharge (HID) xenon bulb rated at 85V and 35W, built to ECE standards for use worldwide. It features a PK32d-2 base with an integral ignitor and is designed specifically for projector-type housings, meaning it is not interchangeable with reflector-style headlamp assemblies.
The H7 is a single-filament halogen bulb rated at 12V and 55W, carrying a PX26d base. Unlike the D1S and H15, the H7 holds approval not only under ECE standards but also in the United States and Japan, giving it broader regulatory acceptance across markets.
The H15 is a dual-filament halogen bulb rated at 12V with filaments at 55W and 15W, using a PGJ23t-1 base. Its dual-filament design allows it to serve both high beam and daytime running light functions within a single bulb unit.
On the Mercedes-Benz GLK350, the high beam position for 2010-2012 model years uses only the H7 bulb, with no HID option listed for those years in that position. From 2013-2015, the high beam position splits between D1S for HID-equipped vehicles and H15 for halogen capsule-equipped vehicles.
The low beam position across 2010-2015 consistently offers both D1S and H7 fitments depending on whether the vehicle is equipped with HID or halogen capsule headlamps, making headlamp system type the determining factor for bulb selection in that position throughout the full model range covered.
The D1S and H7 are not interchangeable despite both appearing in headlamp positions on the same vehicle. The D1S operates at 85V through a discharge arc and requires a projector housing with an integrated ignitor, while the H7 operates at 12V through a tungsten filament and fits a standard halogen reflector or projector housing.
The H15 used in the high beam position for 2013-2015 halogen capsule-equipped vehicles has a PGJ23t-1 base, which is physically distinct from the PX26d base of the H7 used in the low beam position on the same vehicles. The two bulbs are not cross-compatible despite both being 12V halogen types.