The Toyota C-HR dome light utilizes 12961 and DE3175 bulb sizes for the interior illumination system. Data for the specific components covers the range from 2018 through 2022.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The DE3175 is an ANSI-standardized festoon bulb used across North American markets. It measures 31mm in length and makes electrical contact through end-cap terminals rather than a base socket, operating at 12 volts.
The 12961 is a Philips-designated miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base. It operates at 12 volts with a 5-watt output and is installed by pressing into a wedge-style socket without a separate locking mechanism.
The Toyota C-HR dome light uses the DE3175 across the 2018-2021 model years, while the 2022 model year transitions to the 12961 wedge bulb, making the two types non-interchangeable due to their different base configurations.
For the front dome light position, the 2021-2022 model years specify the 12961, whereas the 2018 and 2019 model years specify the DE3175 in a center-designated fitment, reflecting a difference in socket design between those production periods.
The end-cap contact design of the DE3175 festoon bulb is physically incompatible with the wedge socket that accepts the 12961, meaning substitution between the two types is not possible without a socket adapter or housing modification.
The 2019 and 2018 front dome light entries both carry a "Center" designation alongside the DE3175 specification, indicating a positional distinction within the dome light assembly for those model years.