Buick Rainier Map Light Bulb Size

The Buick Rainier map light requires a 194 bulb size for proper installation and function within the interior overhead console. Available data covers the production range from 2004 through 2007.

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
2004-2007	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194

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Additional Notes

The Buick Rainier uses the 194 bulb size for the map light across all listed model years, spanning 2004-2007.
The 194 bulb is classified under the ANSI standard, which is the recognized specification system for automotive lighting in the United States and Canada.
This bulb follows the T10 miniature wedge form factor, a design where the base tapers to a wedge shape and connects directly into a socket without a separate metal base or pins.
The 194 operates at 12 volts, consistent with the standard electrical system voltage found in conventional passenger vehicles.
At 3.78 watts, the 194 is a low-wattage bulb, which is typical for interior courtesy and reading light applications where prolonged use and heat management are relevant factors.
The T10 wedge base is a widely used form factor, meaning the 194 shares physical fitment compatibility with other bulbs of the same base type, though wattage and voltage ratings must align with the vehicle's socket specifications before substitution.