Chevrolet Blazer 2003 Bulb Size
Bulb size chart
This page for the 2003 Chevrolet Blazer helps you verify bulb sizes by lighting position, so you can match the correct replacement before you buy. Whether you are changing a headlight, tail light, interior lamp, or dash indicator, the bulb chart is organized to make fitment checks faster and easier.
The 2003 Blazer used several different bulb types across the exterior and interior lighting system. Because trim level, lighting package, market, and body style can affect what is installed, it is always smart to confirm the bulb at the exact location on your vehicle before ordering replacements.
For best fitment, compare the bulb in your Blazer with the listing for that position and note whether the original setup is halogen or LED. Some owners choose aftermarket LED conversions for brighter output or longer life, but those upgrades may require a different bulb shape, polarity check, or added load resistors to avoid warning issues or hyperflash. If your truck has been modified, or if a previous owner installed non-original bulbs, the part number on the page may not match what is currently in the socket. The safest approach is to inspect the installed bulb, confirm the base style and size, and then purchase the replacement that matches both the socket and the lighting function.
FAQ
What bulb size does the 2003 Chevrolet Blazer use for the high beam headlight?
The high beam headlight bulb listed for the 2003 Chevrolet Blazer is 9005.
What is the brake light bulb size on this Blazer?
The brake light bulb listed for the 2003 Chevrolet Blazer is 3057R.
What bulb fits the tail light on a 2003 Chevrolet Blazer?
The tail light bulb listed for this model year is 3057R.
What is the rear turn signal bulb size?
The rear turn signal bulb listed for the 2003 Chevrolet Blazer is 3057.
What bulb is used for the front turn signal and parking light?
Both the front turn signal light and the front parking light are listed as 3157 on this page.
What size is the front fog light bulb?
The front fog light bulb listed for the 2003 Chevrolet Blazer is 881.
What bulb fits the back up reverse light?
The back up reverse light bulb listed for the 2003 Chevrolet Blazer is 3156.
What are the license plate light bulb options?
The license plate light bulb is listed as 194 or 7441.
What bulb is used for the glove box light?
The glove box light bulb is listed as 194 or 7441.
What bulb fits the dome light?
Two dome light options are listed on this page: 562 and 564, depending on the original setup.
What bulb is used for the map light?
Two map light options are listed: 194 or 7441 for one original style, and 212-2 for the alternate original style.
What bulb is listed for the instrument panel lights?
The instrument panel light bulb listed for the 2003 Chevrolet Blazer is PC168.
What bulb is used for the front side marker light?
The front side marker light bulb listed for this vehicle is 194NA.
What bulb fits the trunk or cargo area light?
The trunk or cargo area light bulb listed is 211-2.
Why should I check the bulb already installed in my Blazer before buying replacements?
Because trim and lighting package differences can change what is installed, and some vehicles may have been repaired or modified with non-original bulbs. Checking the installed bulb helps confirm the exact fit before purchase.