The Dodge Omni brake light requires a 1157 bulb size for proper illumination and function within the rear lighting assembly. Available data covers the period from 1978 through 1990 for the specified vehicle and component.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Dodge Omni uses the 1157 bulb as its brake light across all listed model years, spanning 1978-1990.
The 1157 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 21W/5W output. The dual-filament design allows it to serve both brake and tail light functions within a single housing.
The BAY15d bayonet base features two offset pins, which physically prevent incorrect installation of a single-filament bulb in a dual-filament socket.
For the Center High Mount Stop Light, the Dodge Omni uses three distinct bulb types across the 1985-1990 model years: the 1157, 912, and 168.
The 912 is a wedge-base bulb of the T15 form factor, rated at 12V and 12W. It is a variant of the 921 bulb, meaning the two types share close electrical characteristics but are not always interchangeable depending on socket fit.
The 168 is a miniature wedge bulb of the T10 form factor, rated at 12V and 4.9W. Its significantly lower wattage compared to the 912 and 1157 reflects its use in lower-intensity lighting applications.
The 1987 Dodge Omni Center High Mount Stop Light specifies the 168 bulb, while the surrounding model years specify the 912. These bulbs differ in both physical size and wattage, making them non-interchangeable without socket modification.
The 1985 Dodge Omni Center High Mount Stop Light specifies the 1157, which is the same bulb used in the standard brake light position. This differs from the 912 specified for the 1986 and later years in the same position.
All three bulb types listed in these specifications conform to ANSI standards applicable in both the United States and Canada.
The wedge base of the 912 and 168 bulbs differs fundamentally from the BAY15d bayonet base of the 1157, making cross-substitution between these types physically incompatible without a socket adapter.