Toyota Prius Map Light Bulb Size

The Toyota Prius map light utilizes bulb sizes 168 and 57 for the interior illumination components. Available data covers the range from 2001 through 2019 for the specified vehicle lighting.

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

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2004-2019	168	W5W	Check Price
2001-2003	57	57	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
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 1W.	57	Check Price

Other Locations

Additional Notes

The Toyota Prius map light uses the 168 bulb for model years 2004-2019 and the 57 bulb for model years 2001-2003, reflecting a change in bulb specification between those two production periods.
The 168 bulb is an ANSI-standard miniature wedge type with a T10 form factor, rated at 12 volts and 4.9 watts, recognized across both the US and Canadian markets.
The T10 wedge base of the 168 bulb connects without a separate metal base, relying instead on the tapered plastic wedge of the bulb itself to seat within the socket.
The 57 bulb is an ANSI-standard single-filament type with a BA9s bayonet cap base, rated at 12 volts and 1 watt, also recognized across US and Canadian markets.
The BA9s base of the 57 bulb is a pin-type bayonet fitting, physically incompatible with the wedge socket used by the 168 bulb, meaning the two types are not interchangeable.
At 4.9 watts, the 168 bulb draws considerably more power than the 1-watt 57 bulb, a difference that reflects the distinct electrical configurations of the sockets in which each is used.
Both bulb types operate on a 12-volt circuit, consistent with standard automotive electrical systems.