The BMW 435i Gran Coupe high beam headlight uses D1S and H7 bulb sizes, while the low beam headlight requires a D1S bulb size. The replacement chart covers 2015 to 2016 production 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 BMW 435i Gran Coupe (2015-2016) uses two distinct bulb types across its headlight system: the D1S for HID-equipped vehicles and the H7 for halogen-equipped vehicles, with fitment determined by the headlamp technology installed at the factory.
The D1S is a high-intensity discharge (xenon) bulb operating at 85V and 35W, built to ECE standards for use in projector-type housings. It incorporates an integral ignitor and uses a PK32d-2 base, meaning it cannot be substituted with a standard halogen bulb without significant system modification.
The H7 is a single-filament halogen bulb rated at 12V and 55W with a PX26d base. It conforms to ECE standards and carries approval for use in the United States and Japan as well.
On the BMW 435i Gran Coupe, the D1S serves as both the high beam and low beam bulb in HID-equipped headlamp configurations for the 2015-2016 model years.
The H7 bulb is specified exclusively for the high beam position in halogen capsule headlamp configurations. No H7 fitment is listed for the low beam position, which uses the D1S regardless of headlamp type.
The PK32d-2 base of the D1S and the PX26d base of the H7 are physically incompatible with each other, making cross-substitution between these two bulb types impossible without altering the headlamp housing or wiring.
The integral ignitor built into the D1S bulb is a component specific to HID systems, which require a high-voltage pulse to initiate the arc discharge. This design differs fundamentally from the resistive filament operation of the H7.