If your vehicle uses 9004 HB1 headlight bulbs, you're working with a dual-function design—one bulb that handles both low and high beams. Upgrading your vehicle's headlights from 9004 HB1 halogen bulbs to LED bulbs is an excellent way to improve visibility, energy efficiency, and overall aesthetics.

The process of switching from halogen 9004 bulbs to LED is relatively straightforward. Below is the step-by-step guide that you can refer to.

Also read: 9004 Headlight Bulb Guide: Know Basics & Best 9004 LED Choices

Tools and Materials Required

Before starting, gather the necessary tools and materials for the installation process:

A pair of new 9004 HB1 LED headlight bulbs

Protective gloves (to prevent oils from contaminating the bulbs)

Flathead screwdriver (optional)

Safety glasses (optional for additional protection)

Flashlight (optional for better visibility)

Zip ties (optional for securing wires)

Important Pre-Installation Tips:

Turn Off the Vehicle: Ensure the vehicle is completely turned off, with the keys removed from the ignition.

Cool Down the Lights: Allow the headlights to cool down completely to avoid burns.

Handle With Care: Always wear gloves and avoid touching the bulb directly, as oils from your skin can reduce its lifespan.

Consult Your Manual: Refer to your vehicle's manual for specific instructions or compatibility notes.

Step-by-Step Installation Guide for 9004 HB1 LED Headlight Bulbs

Step 1: Locate and Access the Headlight Assembly

Open the hood of your vehicle to locate the back of the headlight assembly. Depending on your vehicle model, you may need to remove a protective cover or panel to access the bulb.

Step 2: Disconnect the Plug and Remove the Retainer

Locate the plug connected to the back of the halogen bulb. Pull the plug gently to disconnect it. Then, rotate the holder or retainer counterclockwise to release it. Keep the holder nearby for reinstallation later.

Step 3: Remove the Halogen Bulb

Carefully rotate the halogen bulb counterclockwise and gently pull it out of the headlight housing.

Step 4: Prepare the New LED Bulb

The 9004 LED bulb typically comes with a retainer or locking ring. Remove this locking ring from the new LED bulb to prepare it for installation. This step ensures a proper fit into the headlight housing.

Step 5: Install the Locking Ring of the 9004 LED Bulb

Insert the locking ring into the headlight assembly, ensuring it aligns with the slots in the housing. This step may vary slightly depending on the design of the LED bulb.

Step 6: Reattach the Holder

Reinstall the holder or retainer that you removed earlier. Rotate it clockwise to secure it firmly.

Step 7: Insert the New LED Bulb

Place the 9004 HB1 LED bulb into the headlight housing, aligning it with the slots. Gently press down and rotate it clockwise to secure it. Ensure the bulb sits tightly in place.

Step 8: Properly Position the LED Bulb

Ideally, the LED chips should face directly outward—toward the 3 o’clock and 9 o’clock positions—so the light beam spreads evenly and accurately on the road.

However, on certain vehicle models, it may not be possible to rotate or adjust the bulbs to that precise angle due to headlight housing design.

Step 9: Reconnect the Plug

Reconnect the electrical plug to the back of the new LED bulb. Make sure the connection is secure to avoid flickering or power issues.

Step 10: Test the Headlights

Turn on your vehicle and test the headlights to ensure they are functioning correctly. Check both the low and high beam settings for proper operation.

Step 11: Secure Any Excess Wiring

If your LED bulbs come with additional wiring, use zip ties to neatly secure the wires. Ensure no cables interfere with other components in the engine bay.

Related product in this guide:

-15%

Sealight^®

S1 9004/HB1 60W 6000K White IP67 LED Headlight Bulbs 2Pcs

4.6 star rating

(132)

Final Thoughts

Upgrading to 9004 HB1 LED headlight bulbs offers numerous benefits, including brighter light output, energy efficiency, and improved longevity compared to traditional halogen bulbs. By following this step-by-step guide, you can safely and efficiently perform the installation while ensuring optimal performance.

For the best results, consider purchasing high-quality LED bulbs from a trusted brand. A reputable option like SEALIGHT offers a range of 9004 LED headlight bulbs tailored to meet various needs, ensuring durability and compatibility with your vehicle.