The Lexus LX450 back up light utilizes 1156 and P21W bulb sizes for the rear illumination system. Data for the specified lighting components covers the period from 1996 through 1997.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1156 is a single-filament bulb operating at 12 volts and 21 watts, built to ANSI standards for the US and Canadian markets. It uses a BA15s bayonet base, which features a single contact pin offset to one side of the base.
The BA15s bayonet mount is a non-indexed base, meaning the bulb can be inserted in any rotational orientation. This is appropriate for single-filament applications where polarity of the filament position is not a concern.
The Lexus LX450 uses the 1156 bulb across both the standard back up light and the outer back up light positions for the 1996-1997 model years.
The 1996 outer back up light fitment carries a production date qualifier, applying from November 1995 onward. This indicates a mid-production-year specification change took effect at that point in the vehicle's manufacturing run.
Because the 1156 is a single-filament bulb, it is not interchangeable with the visually similar 1157, which is a dual-filament bulb sharing the same bayonet shell size but carrying an additional contact pin. Substituting a 1157 in a 1156 socket would result in only one filament being powered.