Toyota Highlander Courtesy Bulb Size

Additional Notes

• The 168 bulb is a T10 miniature wedge type operating at 12 volts and 4.9 watts. Its wedge base design means it is held in place by the socket itself rather than by a separate locking mechanism, and it follows the ANSI standard applicable in the US and Canada.
• The DE3022 is a festoon-style bulb with a 31mm length and end-cap contacts. Festoon bulbs seat between two spring clips rather than into a wedge socket, making the DE3022 physically incompatible with sockets designed for the 168, despite both operating at 12 volts.
• The Toyota Highlander uses two distinct courtesy bulb types across its model years, and the two types are not interchangeable due to their different base designs.
• The 168 bulb is specified for the 2021-2024 model years, as well as for 2008-2013 and 2001-2005.
• The DE3022 festoon bulb is specified for the 2014-2019 model years of the Toyota Highlander, representing a period where the courtesy lamp socket required end-cap contact fitment rather than a wedge base.
• Both the 168 and the DE3022 conform to ANSI standards for the US and Canadian markets, meaning both are widely available through standard automotive parts channels in those regions.
• The 168 bulb's 4.9-watt rating places it in the low-wattage range typical of interior courtesy lighting, where heat output and power draw are kept minimal.