Cadillac Cimarron Back Up Light Bulb Size

The Cadillac Cimarron back up light utilizes 1156 and P21W bulb sizes according to the provided data. Information for the specified lighting components spans from 1982 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
1982-1988	1156

Bulb Specifications

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

Other Locations

Additional Notes

The Cadillac Cimarron uses the 1156 bulb for the back up light across all model years covered in the specifications, spanning 1982-1988.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, which in this application is the reverse light.
It operates on a 12-volt electrical system and draws 21 watts, placing it in the standard incandescent range for automotive reverse lighting.
The 1156 uses a BA15s bayonet base, a single-contact mount where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d variant.
The BA15s base type is not interchangeable with dual-contact bayonet bases, as the pin configuration differs between the two.
The 1156 designation follows ANSI standards, meaning the bulb specification is recognized across both the United States and Canada.
Because the same bulb size applies across all seven model years in the specifications, no year-specific fitment variations exist for this application on the Cimarron.