Subaru Ascent Map Light Bulb Size

The Subaru Ascent map light requires a bulb size of 168 for the interior lighting system. Available data for the specified vehicle covers the range from 2019 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	US Type	EU Type	Shop
2023	168	W5W	Check Price
2019	168	W5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with W2.1x9.5d wedge base. 12V, 5W.	W5W	Check Price

Other Locations

Additional Notes

The T10 miniature wedge bulb is the format used in the Subaru Ascent map light application. This form factor features a wedge-shaped base that friction-fits directly into a socket without requiring a separate bayonet or screw mechanism.
The 168 bulb operates at 12 volts and 4.9 watts, placing it in the low-wattage range typical of interior courtesy and reading light positions where heat output and current draw are kept minimal.
The 168 designation follows ANSI standardization recognized in both the United States and Canada, meaning the specification reflects a defined and consistent set of electrical and physical parameters across manufacturers.
The Subaru Ascent map light uses the 168 bulb size across the 2019 and 2023 model years. The T10 wedge base is a widely shared platform, though wattage and voltage ratings must match the original specification to avoid socket or circuit issues.