INFINITI Q45 Map Light Bulb Size

Additional Notes

• The DE3175 is a festoon-type bulb with a 31mm length and end-cap contacts, operating at 12V. It is the most consistently specified map light bulb across the INFINITI Q45 model range, appearing in every year from 1995 through 2006.
• Festoon bulbs make contact through metal caps at each end rather than through a base socket, which distinguishes them from wedge and bayonet types used elsewhere in the same vehicle.
• The 168 is a T10 miniature wedge bulb rated at 12V and 4.9W. In the Q45, it serves as a secondary map light bulb alongside the DE3175 center position in 2002, 2004, and 2006.
• The 89 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 13W. It is specified for the front map light position in 2003 and 2005, making it a position-specific fitment rather than a universal replacement across the model range.
• In 2003 and 2005, the front map light position takes either a 168 or an 89 bulb depending on whether the vehicle is equipped with a sunroof. These two bulb types use different base designs and are not interchangeable with each other.
• The 1997 Q45 specification explicitly labels the DE3175 fitment as covering both the driver side and passenger side positions, indicating a dual-socket map light arrangement for that year.
• The DE3175 and 168 are both ANSI-standardized bulbs recognized in the US and Canada, meaning they conform to defined electrical and physical standards rather than being proprietary part numbers.
• The BA15s bayonet base of the 89 bulb requires a twist-lock socket, which is physically incompatible with the end-cap socket used by the DE3175 festoon and the wedge slot used by the 168.