White WHS Back Up Light Bulb Size

The White WHS back up light utilizes a single 1156 bulb size for illumination purposes. Available data for the specific component covers the period from 1981 through 1988.

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	1156
1981-1987	1156 (Except Conventional)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The 1156 is the sole bulb type specified for back up lights across all listed model years of the White WHS.
The 1156 is a single-filament bulb, meaning it serves one lighting function rather than combining two functions such as stop and tail in a shared housing.
It operates on a 12-volt, 21-watt electrical rating, which is standard for incandescent automotive reverse lighting applications.
The 1156 uses a BA15s bayonet base, a single-contact fitting that locks into its socket with a twist rather than a threaded or wedge-style connection.
The 1156 conforms to ANSI standards recognized in both the United States and Canada.
The 1988 White WHS carries no trim or configuration restriction on its 1156 fitment, making it applicable across all variants for that year.
For model years 1981-1987, the 1156 specification is noted with an "Except Conventional" qualifier, indicating that this fitment applies only to non-conventional configurations within those years.
The BA15s base designation denotes a single-contact bayonet cap with a 15mm base width, distinguishing it from the dual-contact BA15d base used in two-filament bulbs such as the 1157.