Chevrolet TrailBlazer 2003 Bulb Size
Bulb size chart
This page helps you verify the bulb sizes for the 2003 Chevrolet TrailBlazer by lighting position, so you can match the correct replacement to each lamp on the vehicle. Whether you are replacing a burned-out exterior bulb or refreshing an interior light, checking the exact location first can save time and prevent ordering the wrong part.
The 2003 TrailBlazer uses a mix of common halogen and small interior bulbs, and some positions may vary by trim, market, or lighting package. Use the bulb chart on this page to confirm the fit for headlights, turn signals, brake lights, cargo lamps, and other locations before you buy.
Fitment can differ between trims and equipment groups, so it is smart to compare the bulb listed for your specific TrailBlazer with the bulb already installed in the vehicle. Some owners choose LED replacements for brighter output or longer life, but aftermarket LED conversions may change beam pattern, bulb color, or warning behavior depending on the lamp position. If you are upgrading from halogen to LED, make sure the bulb is compatible with the housing and socket, and always check the installed bulb before purchase when possible, especially for positions that can vary by package or market.
FAQ
What bulb does the 2003 Chevrolet TrailBlazer use for the high beam headlight?
The high beam headlight bulb listed for the 2003 Chevrolet TrailBlazer is 9005.
What is the daytime running light bulb size on this TrailBlazer?
The daytime running light bulb size listed is 9005.
Which bulb fits the front turn signal and parking light?
The front turn signal light bulb and the parking light bulb are both listed as 3757A.
What bulb is used for the rear turn signal on the 2003 TrailBlazer?
The rear turn signal light bulb is listed as 3157.
What bulb fits the brake light and tail light?
Both the brake light bulb and the tail light bulb are listed as 3157R.
What bulb is used for the back up reverse light?
The back up reverse light bulb is listed as 3157.
What bulb fits the front side marker light?
The front side marker light bulb is listed as 194NA.
What bulb is used for the license plate light?
The license plate light bulb is listed as 2825 or 98.
What bulb fits the dome light and cargo area light?
The dome light bulb and the trunk or cargo area light are both listed as 212-2.
What bulb is used for the glove box, map, and courtesy lights?
The glove box light bulb, map light bulb, and courtesy light bulb are listed as 194 or 7441.
What bulb fits the vanity mirror light?
The vanity mirror light bulb is listed as 37.
What bulb is used for the front fog light?
The front fog light bulb is listed as 880.
Does the center high mount stop light use a standard bulb?
The center high mount stop light bulb is listed as LED, so it is not shown as a standard halogen bulb on this page.
Can trim or body style change the bulb fitment on a 2003 TrailBlazer?
Yes. Trim and lighting package can vary by market and body style, so it is best to confirm the bulb position against your vehicle before ordering.