What is the low beam headlight bulb size for a 1999 Acura SLX?

The 1999 Acura SLX uses a 9004 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 1999 Acura SLX?

The high beam bulb size for the 1999 Acura SLX is 9004 LED.

Why are my 1999 Acura SLX headlights dim?

Dim headlights on a 1999 Acura SLX can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a 9004 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 1999 Acura SLX fog light?

The 1999 Acura SLX uses a H3 LED bulb for the fog light position.

Is the 1999 Acura SLX single or dual beam?

The 1999 Acura SLX uses a single bulb (dual filament) headlight system. This means one bulb controls both high and low beams.

Can I install LED bulbs on my 1999 Acura SLX?

Yes, the 1999 Acura SLX comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a 9004 LED LED conversion kit for the low beams.

Does the 1999 Acura SLX have fog lights?

Yes, the 1999 Acura SLX takes a H3 LED bulb for the fog light position.

Did the 1999 Acura SLX change headlight bulb sizes from the previous year?

No — the 1999 Acura SLX uses the same bulb sizes as the 1998 model. This configuration has been consistent across the 1996–1999 generation.

Is the 1999 Acura SLX the first or last year to use 9004 LED bulbs?

The 1999 Acura SLX is the last year in the 1996–1999 generation to use the 9004 LED bulb for the low beam headlight.

How do I change the headlight on a 1999 Acura SLX?

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 9004 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 1999 Acura SLX?

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 9004 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 1999 Acura SLX headlights?

A pair of halogen 9004 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 1999 Acura SLX?

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 9004 LED position are available as direct plug-and-play replacements.

The 1999 Acura SLX is the last model year to use this bulb configuration (1996–1999).

Fitment Guaranteed for 1999 Acura SLX

What Size Bulbs Does a 1999 Acura SLX 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 1999 Acura SLX Have?

When it comes to nighttime visibility, the 1999 Acura SLX relies on an arrangement of 14 specialized bulbs. It features an extensive lighting system powered by a halogen-based setup where a single 9004 LED dual-filament bulb handles both low and high beam duties within the same reflector. This model belongs to the late years of the SLX's 1996-1999 production span.

Can You Put LED Bulbs in a 1999 Acura SLX?

Upgrading to LED is one of the most effective ways to modernize your Acura's appearance and safety profile. Since your SLX uses a single 9004 LED bulb for both high and low beams, ensure your chosen LED kit is "dual-beam" compatible. This allows the LED circuitry to mimic the two-filament design of the original halogen bulb. Don't forget the H3 LED fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

1999 Acura SLX Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	9004 LED	Buy 9004 LED →
High Beam	9004 LED	Buy 9004 LED →
Fog Light	H3 LED	Buy H3 LED →
Brake Light	1157 LED	Buy 1157 LED →
Dome Light	DE3175	Buy DE3175 →
Side Marker	1157	Buy 1157 →
Turn Signal Front	1157	Buy 1157 →
License Plate	168	Buy 168 →
Map Light	DE3022	Buy DE3022 →
Parking Light	1157	Buy 1157 →
Turn Signal Rear	1156	Buy 1156 →
Reverse Light	1156	Buy 1156 →
Trunk Light	DE3175	Buy DE3175 →
Tail Light	1157	Buy 1157 →

How do the 1999 Acura SLX's bulbs compare to other years?

The 1999 Acura SLX uses the same bulbs as the 1998 model.

This bulb configuration covers the 1996–1999 model years. ← 1998

Finding the best installation guide...

Other SLX Years

1998 1997 1996

Other Vehicles That Use 9004 LED Bulbs

2005 Chevrolet Venture 2003 Isuzu Rodeo Sport 2002 Dodge Ram 2500 2002 Dodge Ram 3500 2002 Isuzu Trooper 2001 Nissan Xterra