Mercedes-Benz GLC63 AMG S Back Up Light Bulb Size

The Mercedes-Benz GLC63 AMG S back up light requires a bulb size of 921 for the specific lighting component. Data for the bulb size covers the range from 2018 to 2021.

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
2020-2021	921
2019	921 (With Halogen Capsule Headlamps)
2018	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The 921 bulb is the sole back up light bulb size listed across all model years of the Mercedes-Benz GLC63 AMG S covered in these specifications, spanning 2018-2021.
The 921 is a wedge-type bulb, classified under the T15 form factor, which refers to its tubular shape with a width of 15 thirty-seconds of an inch.
Wedge bulbs use a pinched glass base as the electrical contact point, eliminating the need for a separate metal cap or pins.
The 921 operates at 12 volts and 16 watts, which is consistent with standard automotive low-current signaling and reversing light applications.
The 921 carries an ANSI designation, meaning it conforms to a standardized specification recognized across the United States and Canada, ensuring consistent electrical and physical characteristics across manufacturers.
The 2019 Mercedes-Benz GLC63 AMG S specifies the 921 bulb specifically under the condition of Halogen Capsule Headlamps, indicating a trim or package dependency for that model year.
The T15 wedge form factor of the 921 is shared by several related bulb types, and substitution with visually similar wedge bulbs of differing wattage or voltage ratings would fall outside the listed specification.