Jaguar Vanden Plas Map Light Bulb Size

The Jaguar Vanden Plas map light utilizes bulb sizes 12961 and 3893 for the interior illumination system. Provided information covers the span of time from 1984 through 2009.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1995-2009	12961
1984-1994	3893

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, specialty application. 12V.	3893

Other Locations

Additional Notes

The Jaguar Vanden Plas map light uses two distinct bulb sizes across its model history: the 12961 for 1995-2009 and the 3893 for 1984-1994.
The 12961 is a Philips part number designating a miniature wedge-style T10 bulb with a W2.1x9.5d base, rated at 12V and 5W.
The T10 wedge base on the 12961 is a friction-fit design, meaning the bulb is held in place by tension rather than a locking mechanism.
The 3893 follows the ANSI standard recognized in the United States and Canada, and it carries a BAY15d bayonet base with dual filaments, rated at 12V.
The BAY15d bayonet base on the 3893 uses a twist-and-lock mounting style with two offset pins, which prevents incorrect insertion.
The dual-filament construction of the 3893 is a notable technical distinction from the single-filament 12961, and the two bulbs are not interchangeable due to differences in base type, filament count, and physical form.
The transition from the 3893 to the 12961 occurred between the 1994 and 1995 model years of the Jaguar Vanden Plas, representing a change in both bulb standard and base configuration for the map light position.
Because the W2.1x9.5d wedge base and the BAY15d bayonet base are mechanically incompatible, substituting one bulb type for the other is not possible without modification to the socket.