The Mazda Navajo brake light requires a 3157 bulb size for proper installation and function within the rear lighting assembly. Data for the specified component covers the range from 1991 to 1994.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mazda Navajo uses the 3157 bulb for the brake light position across all four model years covered, spanning 1991-1994.
The 3157 is a dual-filament T25 wedge bulb rated at 12V with a 27W/7W output, where the higher wattage filament serves the brake function and the lower wattage filament serves a secondary function such as running or tail light duty.
Its dual-filament design means the 3157 handles more than one lighting function within a single socket, which is a common arrangement in combined stop and tail light assemblies.
The center high mount stop light on the Navajo uses different bulb sizes depending on the model year, with the 921 fitted to 1991-1992 models and the 912 fitted to 1993-1994 models.
The 912 and 921 are both T15 wedge bulbs operating at 12V, but they differ in wattage: the 921 is rated at 16W while the 912 is rated at 12W, making them non-identical despite sharing the same physical form factor.
The 912 is formally classified as a variant of the 921, which indicates a degree of physical compatibility, though the wattage difference of 4W means substituting one for the other will produce a difference in light output.
All bulb sizes listed across both positions conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical specifications within those markets.
The shift from the 921 to the 912 in the center high mount stop light between the 1992 and 1993 model years represents a factory specification change, and using the earlier 921 in a 1993-1994 application would result in a higher wattage than originally specified.