The Mazda GLC front side marker bulb accommodates 3 different sizes including 1157, 194, and 89, while the rear side marker bulb size options consist of 194 and 89. The replacement chart covers vehicle production years spanning 1979 to 1985.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mazda GLC front side marker uses three distinct bulb types across its model years: the 1157, 194, and 89, each with different base types and wattage ratings.
The 1157 is a dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base. Its dual-filament design distinguishes it from the single-filament bulbs also present in the GLC specifications.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W. Its wedge base differs fundamentally from the bayonet bases used by the 1157 and 89, making it physically incompatible with those sockets.
The 89 uses a BA15s single-contact bayonet base and is rated at 12V and 13W. It is described as a lower wattage variant of the 1156 bulb, sharing the same base type but drawing less power.
Although the 89 and 1157 both use bayonet bases, the 89 uses a BA15s single-contact base while the 1157 uses a BAY15d dual-contact base. These two base types are not interchangeable despite their outward similarity.
All three bulb types in the GLC specifications conform to ANSI standards applicable in both the United States and Canada.
For the Mazda GLC, the front side marker specification changed from the 89 bulb in 1979-1980 to the 194 in 1981-1982, and then to the 1157 in 1984-1985, reflecting two distinct socket changes across the production run.
The rear side marker of the GLC used the 194 wedge bulb across 1980-1985, while the 1979 model year used the 89 bayonet bulb, indicating a socket change between those two model years at the rear position.
Because the front and rear side marker sockets do not share the same bulb type in all model years, a bulb that fits one position on a given year GLC does not necessarily fit the other position on the same vehicle.
The 194 is the only bulb type that appears in both the front and rear side marker positions of the GLC, though not always within the same model year.