Mazda B2500 Back Up Light Bulb Size

The Mazda B2500 back up light requires bulb size 2456, 2356, or 3156 depending on the specific version of the component. Data for the requested information covers the range from 1998 through 2001.

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
2001	2456
2000	2356
1999	2456
1998	3156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, specialty application. 12V.	2456
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V.	2356
ANSI standard (US & Canada). Single-filament wedge bulb (T25). 12V, 27W.	3156

Other Locations

Additional Notes

The Mazda B2500 backup light bulb specifications cover the 1998-2001 model years, with three distinct bulb types used across that range.
The 2456 is an ANSI-standard festoon bulb rated at 12V, designated for specialty applications. It is specified for the Mazda B2500 in the 1999 and 2001 model years.
The 2000 model year uses the 2356, an ANSI-standard 12V dual-filament bulb with a BAY15d bayonet base. The dual-filament design means the bulb houses two separate filaments within a single envelope, each serving a different function.
The 1998 model year uses the 3156, an ANSI-standard single-filament wedge bulb of the T25 type, rated at 12V and 27W.
The three bulb types differ in base design: the 2456 uses a festoon mounting, the 2356 uses a BAY15d bayonet base, and the 3156 uses a wedge base. These base differences make the bulbs physically non-interchangeable despite sharing the same 12V operating voltage.
The 2000 model year 2356 is the only dual-filament bulb among the four specified years. Using a single-filament replacement in its place would result in the loss of one of the two filament functions.
All four bulb sizes conform to ANSI standards applicable in both the United States and Canada, indicating standardized performance and dimensional specifications within those markets.
The bulb type changes across consecutive model years, with 1998 using the 3156, 1999 switching to the 2456, 2000 using the 2356, and 2001 returning to the 2456. This pattern indicates that year-specific verification is necessary before replacement.