Chrysler LHS Back Up Light Bulb Size

The Chrysler LHS back up light utilizes bulb sizes 2458, 3157, and 921 depending on the specific version of the component. Data for the lighting components covers the range from 1994 through 2001.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1999-2001	3157
1994-1997	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The Chrysler LHS back up light specifications cover model years 1994-2001, with two distinct bulb sizes used across that span.
The 3157 is a dual-filament wedge bulb classified under the T25 form factor, rated at 12V with a 27W/7W power split between its two filaments. It carries ANSI standard designation for use in the US and Canada.
The 921 is a single-filament wedge bulb classified under the T15 form factor, rated at 12V and 16W. It also carries ANSI standard designation for use in the US and Canada.
The 3157 was specified for the Chrysler LHS for model years 1999-2001.
The 921 was specified for model years 1994-1997.
The T25 and T15 designations refer to the physical size of the wedge base, with T25 being the larger of the two. These two bulbs are not physically interchangeable due to the difference in base size.
The dual-filament design of the 3157 means it carries two separate circuits within a single bulb, a characteristic absent in the single-filament 921. This distinction makes the two bulbs functionally incompatible as direct substitutes.
The wattage difference between the 3157 at 27W and the 921 at 16W reflects a meaningful gap in light output, as higher wattage in equivalent voltage systems generally produces greater luminous intensity.