Toyota Sienna Map Light Bulb Size

Additional Notes

• The Toyota Sienna map light draws from four distinct bulb types across its production span: the 194, 2825, 168, and DE3175, each serving the same interior lighting position but with different physical and electrical characteristics.
• The 194 and 168 are both T10 miniature wedge bulbs operating at 12V, yet they differ in wattage. The 194 draws 3.78W while the 168 draws 4.9W, making them electrically incompatible as direct substitutes despite sharing the same T10 form factor.
• The 2825 is also a T10 wedge bulb but is distinguished by its W2.1x9.5d base, which is a specific base designation indicating a particular pin configuration. At 5W, it is the highest-wattage wedge bulb among those specified for the Sienna map light.
• The DE3175 is a festoon-type bulb with a 31mm length and end-cap contacts, a fundamentally different physical format from the wedge bulbs used in other model years. Festoon bulbs seat into spring-clip holders rather than wedge sockets, making cross-substitution with any T10 wedge type physically impossible.
• The Toyota Sienna (1998-2003) uses the DE3175 festoon bulb for the map light, representing the earliest production years in the specifications.
• The 168 bulb applies to the 2004-2010 model years, covering the longest consecutive span of any single bulb type in these specifications.
• The 2825 applies to the 2011-2014 and 2018 model years, while the 194 applies to the 2023-2024 model years, indicating that the Sienna has used three different bulb types across its more recent production history.
• All four bulb types carry ANSI standardization for the US and Canadian markets, meaning each has a defined specification that allows for cross-brand replacement as long as the ANSI designation matches the year-specific requirement.