How I update my old 9004 HB1 halogen bulbs to the 9004 HB1 LED bulbs

9004 HB1 LED bulbs, installation Guide

Installing 9004 LED bulb in your vehicle can improve your lighting output and visibility on the road. Here’s a step-by-step guide to help you through the installation process:

Tools and Preparation

Tools Needed:

  • Screwdriver (flat or Phillips, depending on your vehicle)
  • Gloves to protect your hands and prevent oils from getting on the bulbs
  • (Optional) Socket wrench set


  • Ensure your vehicle is parked on a flat surface and turned off.
  • Open the hood and disconnect the battery to prevent any electrical issues during installation.

Step-by-Step Installation Guide

Step 1: Access the Headlight Assembly

  1. Locate the Headlight Assembly:Refer to your vehicle's owner manual to find the exact location of the headlight assembly. Typically, this is at the front of the vehicle, behind the headlight lens.
  2. Remove Protective Covers:Some vehicles have protective covers or dust caps behind the headlight assembly. Remove these covers by twisting or unclipping them to access the bulbs.

Step 2: Remove the Old Bulb

  1. Disconnect the Power Connector:Locate the power connector attached to the old bulb. Gently press the release tab and pull the connector away from the bulb.
  2. Remove the Bulb:For 9004 HB1 bulbs, you may need to rotate the bulb slightly and then pull it straight out of the socket. Be careful not to force it as it may have a secure fit.

Step 3: Install the New LED Bulb

  1. Insert the New LED Bulb:Align the LED bulb's tabs with the notches in the headlight housing. Insert the bulb and make sure it fits snugly into place.
  2. Secure the Bulb:Once inserted, rotate the bulb clockwise to lock it into position. Ensure it is securely seated to prevent any movement.
  3. Reconnect the Power Connector:Attach the power connector to the new LED bulb. Make sure it clicks into place securely.

Step 4: Test the Bulb

  1. Reconnect the Battery:Reconnect the vehicle's battery if it was disconnected during the preparation step.
  2. Test the Bulb:Turn on your vehicle’s headlights to test the new LED bulbs. Check both low and high beams to ensure they are functioning correctly and the bulbs are properly seated.

Step 5: Reassemble and Finalize

  1. Replace Protective Covers:Reattach any protective covers or dust caps you removed earlier.
  2. Close the Hood:Close the vehicle’s hood and perform a final check to ensure everything is secure and properly installed.

Additional Tips

  1. Adjust the Headlight Beam: After installing new bulbs, you may need to adjust the headlight beam alignment to ensure proper illumination and avoid blinding other drivers. Refer to your vehicle’s manual for instructions on how to adjust the headlight aim.
  2. Check for CANbus Compatibility: Some vehicles may require CANbus decoders to prevent flickering or dashboard error messages. If your new LED bulbs are flickering or causing errors, you may need to install a CANbus decoder.
  3. Handle with Care: Avoid touching the LED chips or the glass part of the bulbs with your bare hands. Oils from your skin can damage the bulbs. Use gloves or a clean cloth when handling the bulbs.
  4. Consult Your Vehicle Manual: Always refer to your vehicle’s manual for specific instructions and precautions related to your make and model.


Installing 9004 HB1 LED bulb is a relatively straightforward process that can significantly improve your vehicle’s lighting. By following this guide and taking necessary precautions, you can ensure a successful installation and enjoy the benefits of brighter, more efficient LED headlights. If you encounter any difficulties, consult your vehicle’s manual or seek assistance from a professional.

If You Need Video Guide:

Watch the Novsight Headlight bulb install guide Video on the YouTube

If you are not sure if your model is suitable for 9004/HB1 bulbs, you can click LED Bulbs By Vehicle to select your model, or check with Novsight vehicle bulb finder on the top bar.

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Installation guides: click and check the PDF installation manual.


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How do I install the 9004 HB1 LED bulbs?