The INFINITI G37 uses D2S and 9006 bulb sizes for high beam headlights, while low beam headlights require D2S and H1 bulb sizes. The replacement chart covers 2008 to 2013 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 D2S is the most prevalent bulb type across the Infiniti G37's headlight specifications, appearing in both high beam and low beam positions throughout the 2008-2013 model years. It is an HID (xenon) discharge bulb operating at 85V and 35W, built to the ECE standard for use in projector-type housings, and requires an external ignitor to function.
The D2S uses a P32d-2 base, which is specific to HID projector applications and is not interchangeable with standard halogen sockets. Substituting a halogen bulb in a housing designed for the D2S would be incompatible without modification.
The H1 is the second bulb type listed for low beam positions on the G37. It is a single-filament halogen bulb rated at 12V and 55W, built to the ECE standard but also approved for use in the United States and Japan. Its P14.5s base is a single-pin design.
For the 2011 G37, the H1 low beam fitment applies only to vehicles produced from August 2011 onward, indicating a mid-year specification change within that model year.
A parallel mid-year change is recorded for the 2008 G37, where the H1 low beam fitment also applies from August 2008 onward, suggesting the same production-date-dependent split existed at the model's introduction.
The 9006 bulb appears exclusively in the 2010 G37 high beam position and is listed with an Amber designation. It is a single-filament halogen bulb rated at 12V and 55W, built to the ANSI standard used in the US and Canada, with a P22d base.
The H1 and 9006 share the same wattage rating of 55W at 12V, but their bases differ. The H1 uses a P14.5s single-pin base, while the 9006 uses a P22d bayonet-style base, making the two types physically non-interchangeable despite identical power ratings.
The presence of both D2S and H1 listings for the same model year in the low beam position reflects that the G37 was produced with more than one headlight system configuration, and the correct bulb type for a given vehicle depends on which housing assembly is installed.