Mazda B2300 Back Up Light Bulb Size

Additional Notes

• The Mazda B2300 backup light specifications span model years 1994 through 2009, with five distinct bulb sizes appearing across that range: 3155, 2355, 2456, 3156, and 2356.
• The 2456 is the most frequently specified bulb across the B2300 lineup, appearing in the 1994-1995, 1997, 2001-2002, and 2004-2005 model years. It is an ANSI-standard festoon bulb rated at 12V and designated for specialty applications.
• The 3155 and 3156 are both single-filament wedge bulbs of the T25 form factor, each rated at 12V and 27W. Despite their near-identical specifications, the B2300 uses the 3155 in 2007 and 2009, while the 3156 appears exclusively in the 2003 model year.
• The 2355 and 2356 are both dual-filament bulbs sharing the BAY15d bayonet base and a 12V rating. The BAY15d base features two offset pins that prevent incorrect installation orientation, a design common to dual-filament automotive bulbs.
• The 2355 is specified for the 2006 and 2008 model years, while the 2356 is specified for 1996. Although these two bulbs share the same base type and voltage, they are distinct ANSI part numbers and are not listed as interchangeable within these specifications.
• The festoon form factor of the 2456 differs structurally from the wedge and bayonet base types also present in the B2300 specifications. Festoon bulbs are cylindrical and mount by contact pressure at each end rather than by a base socket, which makes them physically incompatible with wedge or bayonet housings.
• The single-filament design of the 3155 and 3156 means each bulb serves one lighting function, which is consistent with their use in a dedicated backup light circuit rather than a combined stop and tail application.
• The dual-filament 2355 and 2356 bulbs are capable of serving two independent lighting functions within a single housing, though the specifications designate them here solely for the backup light position on the B2300.
• All five bulb sizes listed in the Mazda B2300 backup light specifications conform to ANSI standards applicable in both the United States and Canada, indicating compliance with North American automotive lighting norms.
• The B2300 uses different bulb sizes across consecutive model years in several instances, such as the shift between the 2456 in 2005 and the 2355 in 2006, meaning year-specific verification is necessary before replacement.