Maserati 430i Back Up Light Bulb Size

The Maserati 430i back up light requires bulb size 1156 or P21W depending on the specific configuration of the lighting assembly. Data for the bulb sizes covers the range from 1989 to 1990.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1989-1990	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The 1156 is the sole bulb type listed for the Maserati 430i backup light across both available model years, 1989-1990.
The 1156 operates on a 12-volt electrical system and draws 21 watts, placing it in the standard range for single-circuit automotive lighting applications.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin offset to one side, which allows the bulb to seat in only one rotational orientation.
As a single-filament bulb, the 1156 is dedicated to one lighting function, which in this application is the backup light circuit.
The 1156 is an ANSI-standardized type recognized across the United States and Canada, meaning physical and electrical specifications are consistent across manufacturers producing bulbs under that designation.
The BA15s bayonet base of the 1156 is not interchangeable with the BA15d base found on dual-filament bulbs such as the 1157, despite the two types sharing the same 15mm base collar width.