Cadillac Escalade Map Light Bulb Size

The Cadillac Escalade map light utilizes bulb sizes 212-2 and 578 and 168 for various interior lighting applications across the vehicle interior. Data for the specific bulb sizes covers the range from 1999 through 2014 for the identified luxury sport utility vehicle.

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
2007-2014	212-2
2002-2006	578
1999-2000	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The Cadillac Escalade map light uses one of three bulb types across its model years: the 212-2, the 578, and the 168, all of which conform to ANSI standards applicable in the US and Canada.
The 212-2 bulb is a festoon type with a 41mm length and an SV8.5 base, rated at 12V and 12W. The SV8.5 base uses a central metal cap on each end that seats into spring-loaded holders inside the fixture.
The 578 bulb is also a festoon type with a 41mm length, rated at 12V and 12W, but it uses end-cap contacts rather than an SV8.5 base. This contact difference makes the 212-2 and 578 physically distinct despite sharing the same length and wattage.
Because the 212-2 and 578 differ in their base and contact design, they are not directly interchangeable, even though both are 41mm festoon bulbs operating at the same voltage and wattage.
The Cadillac Escalade (2007-2014) uses the 212-2 bulb for the map light position.
The 578 bulb is specified for the 2002-2006 model years, representing a distinct fitment period before the transition to the 212-2.
The 168 bulb is a T10 miniature wedge type, rated at 12V and 4.9W. Its wedge base design is fundamentally different from the festoon format used in the 212-2 and 578, and it is not interchangeable with either festoon bulb.
The 1999-2000 Escalade uses the 168 wedge bulb for the map light, which draws significantly less wattage than the festoon bulbs specified for later model years.