Buick Reatta Map Light Bulb Size

The Buick Reatta map light requires a bulb size of 192 for the interior lighting system. Data for the specified component covers the period from 1988 through 1991.

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
1988-1991	192

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3W.	192

Other Locations

Additional Notes

The 192 bulb is the sole map light bulb size listed for the Buick Reatta across all four model years covered by these specifications, spanning 1988-1991.
The 192 bulb follows the ANSI standard, meaning it conforms to a recognized North American specification used in both the United States and Canada.
It is a miniature wedge-type bulb, classified under the T10 designation. The wedge base design means the bulb is held in place by the socket gripping the glass envelope directly, with no separate metal base or pins.
The T10 designation refers to the bulb's tubular shape, with a width of ten-eighths of an inch. This is a widely used form factor in automotive interior lighting applications.
The 192 bulb operates at 12 volts, which is consistent with the standard electrical system voltage found in conventional passenger vehicles.
At 3 watts, the 192 bulb draws a low level of power, a characteristic typical of interior courtesy and map lighting where prolonged use without the engine running is common.
The consistent fitment of the 192 bulb across all four Reatta model years indicates no mid-cycle change was made to the map light socket or bulb specification during the vehicle's production run.