Geo Prizm Dome Light Bulb Size

The Geo Prizm dome light requires a DE3175 bulb size for proper installation within the interior cabin. Available information covers a specific production span from 1989 through 1997.

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
1989-1997	DE3175

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The DE3175 is the dome light bulb size specified for the Geo Prizm across all available model years in the data, spanning 1989-1997.
The DE3175 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket.
Festoon bulbs are held in place by spring-loaded clips that press against the end caps, a mounting style common in interior dome and map light applications.
The DE3175 has a nominal length of 31mm, which is a critical fitment factor, as festoon bulbs must match the span between the fixture's contact clips.
The bulb operates at 12 volts, consistent with standard automotive electrical systems.
The DE3175 carries an ANSI designation, indicating it conforms to a standardized specification recognized in both the United States and Canada.
Because the DE3175 is an ANSI-standardized part, bulbs from different manufacturers carrying the same designation are generally interchangeable, provided the 31mm length and end-cap contact design are maintained.
The uninterrupted use of the DE3175 across the entire 1989-1997 production span of the Geo Prizm indicates a consistent dome light fixture design throughout the model's production run.