Renault R15 Back Up Light Bulb Size

The Renault R15 back up light requires bulb size 1156 or P21W depending on the specific version of the vehicle. Data for the bulb sizes covers the range from 1974 to 1976.

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
1974-1976	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 1156 is the sole bulb type listed for the Renault R15 back up light across the 1974-1976 model years.
The 1156 is an ANSI-standardized bulb, meaning its physical and electrical specifications conform to a defined North American standard used in the United States and Canada.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is typical of incandescent single-filament automotive bulbs used for back up lighting.
The single-filament design of the 1156 means it serves one lighting function only, distinguishing it from dual-filament bulbs that handle two functions such as braking and running light within a single unit.
The 1156 uses a BA15s bayonet base, where "BA15" refers to a 15mm bayonet cap and "s" denotes a single contact at the base, a configuration that allows the bulb to be inserted and locked with a short twist.
The BA15s base is not interchangeable with the BA15d base, which carries two contacts and is used for dual-filament bulbs, making base type a critical factor in fitment for the Renault R15.