Toyota Highlander Cornering Bulb Size

Additional Notes

• The Toyota Highlander uses the 921 bulb size for its cornering function across the 2020-2023 model years.
• The 921 is a wedge-type bulb, classified under the T15 designation, which refers to its tubular glass envelope measuring 15 eighths of an inch in width.
• The 921 operates at 12 volts and 16 watts, placing it in the low-wattage range typical of auxiliary lighting functions such as cornering.
• The 921 conforms to ANSI standards, meaning its physical and electrical characteristics are regulated for consistency across manufacturers in the United States and Canada.
• The wedge base of the 921 requires no separate metal base or locking pins; the glass envelope itself acts as the retention mechanism when inserted into a compatible socket.
• The T15 wedge format is shared by several bulb numbers with varying wattages, so substitution with a visually similar wedge bulb of a different number risks a wattage mismatch with the socket rating of the Toyota Highlander cornering assembly.