Nissan Quest Map Light Bulb Size

Additional Notes

• The Nissan Quest uses two distinct bulb form factors across its model years for map lighting: the T10 miniature wedge type and the festoon type, each with different base configurations and power ratings.
• The T10 wedge bulbs used in the Quest, including the 12961, 168, and 158, all share the same T10 form factor but differ in wattage: the 12961 draws 5W, the 168 draws 4.9W, and the 158 draws 3W. Despite the shared form factor, these are not confirmed interchangeable across model years.
• The 12961 is a Philips-branded part number rather than an ANSI standard designation. It uses a W2.1x9.5d base and operates at 12V, 5W, making it a manufacturer-specific reference for what is otherwise a T10 wedge bulb.
• The DE3175 is a 31mm festoon bulb with end-cap contacts, while the 578 is a 41mm festoon bulb also with end-cap contacts. The difference in length means these two festoon types are not interchangeable, as festoon bulbs must match the fixture's contact spacing.
• The Nissan Quest (2011) carries a production date qualifier, specifying the 12961 and DE3175 bulbs only for vehicles built from November 2010 onward. This indicates a mid-cycle specification change within the 2011 model year.
• From 2012-2017, the Quest consistently uses the 12961 for the front map position and the DE3175 for the driver side and passenger side positions, reflecting a stable dual-bulb configuration across that generation.
• In the 2017 model year, the front map light position is labeled "Front-Center" rather than simply "Front," and the secondary position is labeled "Rear" rather than "Driver side and Passenger side," suggesting a different interior layout compared to the 2011-2016 models.
• The 578 festoon bulb, used in the Quest from 1999-2002, operates at 12V and 12W, a notably higher wattage than any other bulb type in these specifications. The DE3175 used in later years has no wattage listed in the provided data.
• The 168 bulb, used in the Quest from 2004-2009, is an ANSI-standard T10 wedge rated at 4.9W. Its single-position fitment across those years indicates a simpler, single-zone map light arrangement compared to the dual-position setup of later generations.
• The 158 bulb, used in the Quest from 1993-1995, is the lowest-wattage T10 wedge in these specifications at 3W. It is an ANSI-standard part, distinct from the higher-wattage T10 variants used in subsequent generations of the vehicle.