Chevrolet Astro Courtesy Bulb Size

Additional Notes

• The Chevrolet Astro courtesy bulb specifications span the 1985-2005 model years and reference four distinct bulb types: 168, 194, 906, and 212-2.
• The 168 and 194 are both ANSI-standard miniature wedge bulbs sharing the T10 form factor and 12V operating voltage, though they differ in wattage. The 168 draws 4.9W while the 194 draws 3.78W, making them physically interchangeable in many sockets but not electrically identical.
• The 906 is also an ANSI-standard T10 miniature wedge bulb rated at 12V and 8W, placing its power draw between the 168 and the 212-2 in terms of output.
• The 212-2 is a festoon-style bulb with an SV8.5 base and a 41mm length, operating at 12V and 12W. Its festoon construction differs fundamentally from the wedge-base types used in all other model years, meaning it is not interchangeable with the 168, 194, or 906.
• The Chevrolet Astro (1985-1988) uses the 212-2 festoon bulb for courtesy lighting, with the exception of the 1989 model year, which uses the 906 wedge bulb instead.
• From 1994 through 1998, and again in 1999-2003, the Astro specifies the 194 bulb for courtesy applications across multiple consecutive model years.
• The 168 bulb appears in the 2000-2001 and 2004-2005 model years, alternating with the 194 across the later production period, which reflects a fitment distinction that warrants attention when sourcing replacements for specific years.