The Saturn L100 brake light requires bulb size 3157 or 2458 depending on the specific configuration of the vehicle. Data for the lighting components covers the range from 2001 to 2002.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Saturn L100 uses the 3157 bulb for brake lights across the 2001-2002 model years. This bulb follows the ANSI standard applicable in both the US and Canada.
The 3157 is a dual-filament wedge bulb with a T25 form factor, operating at 12V with a wattage split of 27W for the high-intensity filament and 7W for the low-intensity filament. The dual-filament design allows a single bulb to serve both brake and running light functions.
The Center High Mount Stop Light on the Saturn L100 does not share a bulb type with the standard brake lights. It uses a separate miniature wedge bulb from the PC series rather than the 3157.
The 2002 L100 Center High Mount Stop Light takes a PC175 bulb, while the 2001 model uses a PC168. These two model years are not interchangeable for this position.
Both the PC175 and PC168 are T10 miniature wedge bulbs that operate at 12V and conform to the ANSI standard for the US and Canada. Each uses a printed circuit board twist-lock socket, a mounting type associated with instrument cluster applications.
The printed circuit board twist-lock socket on the PC175 and PC168 is a distinct interface that differs from standard wedge or bayonet sockets, meaning general-purpose T10 wedge bulbs are not direct substitutes for these positions.