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Used for: Fog Light Bulb Front
Used for: Headlight Bulb High Beam
Used for: Headlight Bulb Low Beam
Used for: Back Up Reverse Light Bulb, Turn Signal Light Bulb Rear
Used for: Brake Light Bulb, Tail Light Bulb
Used for: Daytime Running Light Bulb
Used for: License Plate Light Bulb, Glove Box Light Bulb
Used for: License Plate Light Bulb, Glove Box Light Bulb
Used for: Parking Light Bulb, Turn Signal Light Bulb Front
Used for: Side Marker Light Bulb Front, Side Marker Light Bulb Rear
Used for: Ash Tray Light Bulb
Used for: Courtesy Light Bulb
Used for: Courtesy Light Bulb
Used for: Dome Light Bulb
Used for: Map Light Bulb, Trunk or Cargo Area Light
Used for: Vanity Mirror Light Bulb
This 2003 Cadillac Escalade bulb size guide helps you verify the correct bulb by lighting position before you buy replacements. Use it to match the bulb for your headlights, tail lights, turn signals, interior lights, and other exterior lamps so you can shop with more confidence.
Because the Escalade could vary by trim, market, and lighting package, the bulb chart on this page is organized by location rather than by a single universal part number. That makes it easier to confirm the right fit for each lamp on your 2003 Cadillac Escalade, whether you are replacing a burned-out bulb or upgrading a specific light.
For best fitment, compare the bulb listed here with the bulb already installed in your vehicle, especially if your Escalade has a different trim, optional lighting package, or a previous aftermarket repair. Some positions use halogen bulbs, while others may be part of an HID or LED setup, so do not assume every lamp can be swapped with a direct LED replacement without checking compatibility, beam pattern, and warning-canceling needs. If your truck has been modified with aftermarket conversions, the original bulb size may no longer match the current hardware, so a quick visual inspection before purchase can save time and avoid returns.
The listed low beam headlight bulb for the 2003 Cadillac Escalade is D1R. This is important to verify before ordering, since low beam fitment can differ from the high beam bulb and from aftermarket conversion kits.
The high beam headlight bulb is 9005. If one side is out, it is a good idea to replace bulbs in pairs so the light output stays even.
The front turn signal bulb is 3157A. The same bulb size is also listed for the front parking light position on this page.
The rear turn signal bulb is 3157. Always confirm the socket and lens arrangement on your specific vehicle, since rear lighting can vary with market or body style.
The brake light bulb is 3157R. If the tail light and brake light share the same bulb in your Escalade, make sure you are replacing the correct function and not just the lens location.
The tail light bulb is 3157R. This is the bulb size shown for the rear tail lamp function on the 2003 Cadillac Escalade page.
The front fog light bulb is 880. If you are upgrading to LED, check for proper fitment, heat management, and whether the new bulb pattern works well in the factory fog lamp housing.
The daytime running light bulb is 4114. Because daytime running light setups can differ by trim or market, it is smart to confirm the installed bulb before buying.
The center high mount stop light uses an LED bulb setup on this page. If the third brake light is not working, inspect the assembly and connector as well as the bulb source.
The dome light bulb is 211-2, and the map light bulb is 578. The trunk or cargo area light also uses 578, so it is worth checking each interior position separately.
The license plate light bulb is listed as 194 or 7441. Either of those sizes may appear depending on the exact lamp design and market variation.
Some positions can be converted to LED, but not every socket or housing will work the same way. Check for fitment, polarity, heat, and possible bulb-out warnings before changing from halogen to LED.
Trim level, lighting package, and prior repairs can change what is actually in the vehicle. Checking the installed bulb helps confirm the exact match and avoids ordering the wrong part for your 2003 Cadillac Escalade.