What is the low beam headlight bulb size for a 2003 Cadillac Seville?

The 2003 Cadillac Seville uses a 9006 LED bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2003 Cadillac Seville?

The high beam bulb size for the 2003 Cadillac Seville is 9005 LED.

Why are my 2003 Cadillac Seville headlights dim?

Dim headlights on a 2003 Cadillac Seville can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a 9006 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2003 Cadillac Seville fog light?

The 2003 Cadillac Seville uses a 880 LED bulb for the fog light position.

Is the 2003 Cadillac Seville single or dual beam?

The 2003 Cadillac Seville uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2003 Cadillac Seville?

Yes, the 2003 Cadillac Seville comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a 9006 LED LED conversion kit for the low beams.

Does the 2003 Cadillac Seville have fog lights?

Yes, the 2003 Cadillac Seville takes a 880 LED bulb for the fog light position.

How do I change the headlight on a 2003 Cadillac Seville?

Turn off the vehicle and open the hood. Locate the headlight assembly from behind, remove the dust cover or retaining clip, disconnect the wiring harness, twist the old 9006 LED bulb counter-clockwise to remove it, then insert the new bulb and reassemble. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

Are LED headlights legal for a 2003 Cadillac Seville?

LED bulbs used off-road or in auxiliary lights are legal everywhere. For on-road headlight use, legality varies by state. Many states allow LED retrofits as long as the beam pattern meets DOT standards. For the best legal compliance, choose a DOT-approved 9006 LED LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 2003 Cadillac Seville headlights?

A pair of halogen 9006 LED bulbs costs $15 to $40, while LED conversion kits run $25 to $60 per pair. If you have a shop do the work, expect an additional $20 to $50 in labor per bulb. Replacing them yourself at home saves the labor cost and usually takes under 30 minutes.

What is the difference between halogen and LED for a 2003 Cadillac Seville?

Halogen bulbs produce a warm yellow light (around 3200K), last 500 to 1000 hours, and draw more power. LED bulbs emit a brighter white light (5000-6000K), last 25,000+ hours, and use less energy. LED upgrades for the 9006 LED position are available as direct plug-and-play replacements.

This vehicle is part of the 2001–2004 Cadillac Seville generation. All models in this range share identical light bulb sizes.

Fitment Guaranteed for 2003 Cadillac Seville

What Size Bulbs Does a 2003 Cadillac Seville Use?

Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.

Installation Difficulty

Easy (Plug and Play)

Est. Replacement Cost

$15 - $40 (Halogen) / $30+ (LED)

What Lighting System Does the 2003 Cadillac Seville Have?

The 2003 Cadillac Seville utilizes a refined lighting configuration featuring 12 distinct bulb positions. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate 9006 LED low beam and 9005 LED high beam bulbs for precise light distribution. This model belongs to the late years of the Seville's 1998-2004 production span.

Can You Put LED Bulbs in a 2003 Cadillac Seville?

Upgrading to LED is one of the most effective ways to modernize your Cadillac's appearance and safety profile. We recommend starting your upgrade with the 9006 LED low beams, as they see the most use. Adding a matching 9005 LED LED kit later will complete the look and ensure consistent lighting performance. Don't forget the 880 LED fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2003 Cadillac Seville Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	9006 LED	Buy 9006 LED →
High Beam	9005 LED	Buy 9005 LED →
Fog Light	880 LED	Buy 880 LED →
Brake Light	LED Bulb	Buy LED Bulb →
Side Marker	194 LED	Buy 194 LED →
Turn Signal Front	4157NA LED	Buy 4157NA LED →
Turn Signal Rear	3057K LED	Buy 3057K LED →
License Plate	194	Buy 194 →
Map Light	168	Buy 168 →
Parking Light	4157NA	Buy 4157NA →
Reverse Light	3157K	Buy 3157K →
Trunk Light	211-2	Buy 211-2 →

Installation Guide

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Other Seville Years

2004 2002 2001 2000 1999 1998

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