Hummer H1 Map Light Bulb Size

The Hummer H1 map light requires a 912 bulb size for proper installation and function within the interior lighting system. Data for the specific component covers the period from 2002 through 2006.

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
2006	912
2002-2004	912

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). Variant of 921. 12V, 12W.	912

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Additional Notes

The 912 is the sole map light bulb size listed for the Hummer H1 across the 2002-2004 and 2006 model years.
The 912 bulb follows the ANSI standard, which is the recognized specification framework used in the United States and Canada for automotive lighting components.
The 912 is a wedge-type bulb, meaning it uses a plastic wedge base rather than a metal pin or bayonet fitting, allowing it to be inserted directly into a compatible socket without a separate holder.
The T15 designation refers to the bulb's tubular shape with a width of 15 eighths of an inch, which is a standard sizing convention in automotive bulb nomenclature.
The 912 operates at 12 volts and 12 watts, which is consistent with the standard low-voltage electrical systems found in passenger vehicles.
The 912 is noted as a variant of the 921 bulb. While both share the same wedge base and voltage rating, the 921 operates at a higher wattage of 16.8 watts, making the two bulbs electrically distinct despite their physical similarities.
The physical resemblance between the 912 and 921 presents a fitment consideration, as the higher wattage of the 921 may exceed the thermal and electrical tolerances of a socket rated for the 912.