Honda Fit Map Light Bulb Size

Additional Notes

• The Honda Fit map light specifications reference three distinct bulb types across the model years listed: the 168, the 12961, and the DE3175.
• The 168 and 12961 are both T10 miniature wedge bulbs operating at 12 volts, which places them in the same physical bulb family despite carrying different designation systems.
• The 168 follows the ANSI standardized numbering system used in the United States and Canada, and it carries a rated wattage of 4.9W.
• The 12961 is a Philips manufacturer part number rather than an ANSI code. It uses a W2.1x9.5d base and is rated at 5W, making it functionally close to the 168 but not an identical specification.
• Because the 168 and 12961 share the T10 wedge form factor yet originate from different classification systems, substitution between them warrants attention to base compatibility before installation.
• The Honda Fit (2019-2020) map light position uses the 168 bulb, while the 2015-2018 model years use the 12961.
• The DE3175 is a festoon-type bulb, which differs fundamentally in construction from the T10 wedge types. It makes contact through end caps at each side of its 31mm body rather than through a wedge base.
• The Honda Fit (2009-2012) map light position uses the DE3175 festoon bulb, which is not interchangeable with the T10 wedge types used in later model years.
• All three bulb types in these specifications operate on a 12-volt circuit, consistent with standard automotive electrical systems.
• The shift from the DE3175 festoon format to T10 wedge formats across the listed model years reflects a change in the physical socket design of the map light housing between generations.