Mitsubishi Outlander Map Light Bulb Size

Additional Notes

• The Mitsubishi Outlander map light uses two distinct bulb types across its model history, with the DE3175 fitted to the 2007-2020 model years and the 12961 fitted to the 2003-2006 model years.
• The DE3175 is a festoon-type bulb measuring 31mm in length and makes contact through end-cap terminals at each end of the bulb body rather than through a base socket.
• The DE3175 operates on a 12-volt circuit, which is standard for automotive interior lighting applications.
• The DE3175 carries ANSI standardization, meaning it conforms to a recognized specification used across the United States and Canada, and equivalent bulbs from different manufacturers sharing this designation are generally interchangeable.
• The 12961 is a Philips part number designation for a miniature wedge bulb of the T10 type, which uses a W2.1x9.5d base, a pinch-style base that is held in place by friction within its socket rather than by a locking mechanism.
• The 12961 is rated at 12 volts and 5 watts, placing it in the low-wattage range typical of interior courtesy and map lighting.
• The DE3175 festoon format and the 12961 wedge format use physically incompatible socket types, so the two bulb sizes are not interchangeable between the model years that specify each one.
• Because the 12961 is identified by a manufacturer part number rather than a universal standard designation, equivalent replacements from other brands would need to match the T10 wedge format with a W2.1x9.5d base at 12V and 5W.