Scion tC Map Light Bulb Size

Additional Notes

• The 168 bulb is the sole map light bulb size specified for the Scion tC across all listed model years.
• The 168 is an ANSI-standard miniature wedge bulb classified under the T10 form factor, operating at 12 volts and drawing 4.9 watts.
• The T10 wedge base design means the bulb is held in place by friction rather than a bayonet or screw mechanism, making it tool-free to remove in most housings.
• The 168 designation is recognized under ANSI standards in both the United States and Canada, reflecting a standardized specification rather than a proprietary one.
• For the Scion tC model years 2009-2013, the 168 bulb fitment is noted specifically for vehicles equipped with a moonroof, indicating a trim-level dependency for that generation.
• Model years 2005-2007 and 2014-2016 carry no such trim condition, meaning the 168 applies regardless of moonroof configuration for those years.
• At 4.9 watts, the 168 bulb falls within the low-wattage range typical of interior courtesy and map lighting, where heat output and current draw are kept minimal.
• Because the 168 shares the T10 wedge base with several other bulb numbers, substitution with physically similar bulbs of differing wattage ratings may affect socket compatibility or circuit load.