Lexus GX460 Map Light Bulb Size

The Lexus GX460 map light utilizes 168 and 194 bulb sizes for the interior lighting system. Data provided for the specific bulbs covers the range from 2010 to 2023.

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
2023	194
2021	194
2010-2019	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

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Additional Notes

The two bulb types specified for the Lexus GX460 map light are the 194 and 168, both of which are ANSI-standardized miniature wedge bulbs sharing the T10 form factor and a 12-volt operating voltage.
Although the 194 and 168 share the same T10 wedge base and voltage rating, they differ in wattage. The 194 draws 3.78 watts, while the 168 draws 4.9 watts, making them non-interchangeable despite their physical similarity.
The 168 bulb is specified for the GX460 map light across the 2010-2019 model years.
The 194 bulb is specified for the 2021 and 2023 model years.
The T10 wedge base is a common miniature bulb format in which the glass envelope tapers into a flat, wedge-shaped plastic base that seats directly into a socket without a separate metal cap or pins.
Both the 194 and 168 are governed by ANSI standards applicable in the United States and Canada, meaning their electrical and physical characteristics conform to a defined specification rather than varying by manufacturer.