How to replace the rear turn signal light bulb?

Yes. Replacing the rear turn signal bulb is a routine maintenance task that most drivers can perform with basic tools. This guide explains how to identify the bulb type, gather supplies, access the housing, and install a replacement, with notes for common variations and LED/sealed assemblies.

Understanding your vehicle’s rear signal setup

Rear turn signals may be housed in a single taillight unit or in a separate bulb socket. Some cars use traditional replaceable bulbs behind a removable lens; others use LED modules or sealed assemblies where individual bulbs cannot be swapped. Start by checking your owner’s manual or inspecting the lens to determine whether you can replace a bulb or if the entire assembly must be serviced.

Common configurations you'll encounter

Knowing the two main layouts helps you prepare and avoid unnecessary disassembly. This section outlines what you’re likely to find.

• Removable lens with a traditional replaceable bulb (bulb swaps). This is the easiest setup—often secured with screws or clips.


• Integrated LED or sealed unit where the bulb cannot be replaced separately. In this case, you may need to replace the entire taillight assembly or LED module, which is typically done by a technician or at a dealership.

Understanding the setup saves time and reduces the risk of damage to the lens or wiring. If you’re unsure, consult the owner’s manual or contact a dealer for guidance.

Tools and bulbs you’ll need

Before you begin, gather the right tools and the correct bulb type to ensure a smooth, safe replacement.

• Replacement bulb that matches your vehicle’s bulb type (common variants include 1156, 1157, 7440, 7443, or PY21W; some regions use other designations). Check the existing bulb or the owner’s manual to confirm exact specification.


• Clean gloves or a lint-free cloth to handle the bulb ( oils from bare skin can shorten bulb life).


• Screwdriver set or socket wrench for removing screws holding the taillight housing, if needed.


• Trim removal tool or a plastic pry tool to avoid damaging clips or lenses.


• Dielectric grease or bulb grease (optional) to improve electrical contact and reduce corrosion.

Having the right parts and tools at hand speeds up the repair and minimizes the risk of damage.

Steps to replace the bulb

These steps cover the most common non-LED, replaceable-bulb configurations. If your car uses an LED or sealed unit, skip to the related guidance at the end.

• Safety first: turn off the ignition, remove the key, and apply the parking brake. If you’ve recently used the hazards, switch them off before handling the light.


• Access the rear signal by opening the trunk or tailgate. Some models require removing an access panel or loosening the lining to reach the taillight housing.


• Remove the lens or housing cover by unfastening screws or clips. Support the lens as you remove it to prevent it from falling.


• Locate the bulb socket. Twist the socket counterclockwise to release it, then pull the old bulb straight out.


• Insert the new bulb, ensuring it seats firmly in the socket. Reattach the socket to the housing by turning clockwise until secure.


• Reinstall the lens/housing cover and any screws or clips. Reconnect any wiring harnesses that were disconnected.


• Test the turn signal by turning on the vehicle and activating the turn signal to confirm proper operation. If it does not light, recheck bulb seating and wiring; a blown fuse or faulty socket could also be to blame.

When finished, ensure the lens is properly sealed to prevent moisture ingress and verify function with a quick road test.

What to do if your car uses an LED or sealed unit

Many newer vehicles use LED rear signals or sealed taillight modules. In these cases, individual bulb replacement is often not possible. Replacement typically requires swapping the entire taillight assembly or LED module, which is usually handled by a dealership or an experienced technician. Always verify with the owner’s manual or a parts professional before attempting a replacement.

Safety and disposal considerations

Handle bulbs carefully and dispose of old bulbs according to local regulations. Avoid touching the glass with bare hands, since oils can shorten bulb life or cause hot spots. Use gloves or a clean cloth, and ensure the vehicle is cool before starting any work.

Summary

Replacing a rear turn signal bulb is a common, doable maintenance task. Start by identifying whether your vehicle uses a traditional replaceable bulb behind a removable lens or a non-replaceable LED/sealed unit. Gather the correct bulb, tools, and protective gear, access the housing, replace the bulb, and test the signal. For LED/sealed units, professional replacement may be necessary. With careful steps, you’ll keep your vehicle compliant and safe on the road.

Bottom line: with the right bulb and a few basic tools, most drivers can complete a rear turn signal bulb replacement quickly and reliably.

How to change a back blinker bulb?

To change a rear blinker bulb, first open the trunk or tailgate, locate the tail light assembly, and access the bulb socket by removing screws or clips or by reaching behind the panel. Next, twist the socket counter-clockwise to remove it, pull the old bulb straight out, insert the new bulb, and reassemble the tail light by twisting the socket back in and securing any fasteners. Finally, test the new bulb to ensure it is working correctly. 
This video demonstrates the entire process of replacing a rear turn signal bulb: 1mNashwauk SteveYouTube · Mar 12, 2023
Step 1: Prepare to access the bulb 

• Open the trunk or tailgate to access the back of the tail light assembly. 
• Remove any access panels or carpeted liners to get a clear view of the bulb sockets behind the tail light assembly. 

This video shows how to access the bulb socket behind the tail light assembly: 57sTinker ForwardYouTube · Jul 18, 2020
Step 2: Remove the tail light assembly (if necessary) 

• If the bulb socket is not accessible from inside the trunk, you may need to remove the entire tail light assembly. 
• Locate and remove any screws or clips holding the assembly in place, often using a flathead screwdriver or a socket wrench. 
• Gently pull the assembly straight toward the rear of the vehicle to dislodge it from its mounting points. 

This video demonstrates how to remove the tail light assembly: 1mSMGYouTube · Jan 11, 2025
Step 3: Remove the old bulb 

• Once you have access to the socket, twist it counter-clockwise about a quarter turn to unlock it from the tail light housing. 
• Pull the socket straight out of the assembly. 
• Carefully pull the old bulb straight out of the socket itself. 

Step 4: Insert the new bulb and reassemble 

• Take the new bulb to a parts store to ensure it is the correct type for your vehicle. 
• Insert the new bulb straight into the socket. 
• Guide the socket back into the tail light housing, making sure the tabs are aligned with the slots. 
• Twist the socket clockwise to lock it into place. 
• Reinstall the tail light assembly, if removed, by reversing the removal steps. 
• Secure all screws or clips, but wait to tighten them fully until you have tested the new bulb. 

This video demonstrates how to insert the new bulb and reassemble the tail light assembly: 48sO'Reilly Auto PartsYouTube · Jan 31, 2018
Step 5: Test the new bulb

• Turn on your vehicle's ignition and activate the turn signal to confirm the new bulb is working correctly. 
• If the bulb still does not work, there may be a wiring issue, or a more serious problem with the vehicle's electrical system. 
• Once the bulb is confirmed to be working, tighten any fasteners you may have left loose. 

How to fix a blinker that is blinking really fast?

To fix a fast-blinking turn signal, you most likely need to replace the burnt-out bulb on the side that is flashing quickly. If that doesn't work, inspect the socket for corrosion, clean it if necessary, or replace the turn signal flasher relay. For modern cars or if you installed LED bulbs, the issue might be caused by the low power draw of LEDs, requiring a replacement with an LED-compatible relay or the installation of inline resistors. 
1. Replace the bulb 

• Why: A burnt-out bulb is the most common cause of fast blinking because it changes the resistance in the circuit. 
• How:
  • Activate the turn signal to identify which side is flashing fast. 
  • Find the bulb by locating the turn signal assembly, usually near the headlight. 
  • Remove the assembly by opening the hood or trunk and removing any fasteners. 
  • Remove the old bulb by twisting it counterclockwise and insert the new one. 
  • Important: Avoid touching the glass of the new bulb with your bare hands, as oils and salt can cause it to burn out prematurely. 

This video demonstrates how to replace a burnt-out turn signal bulb: 59sThomas of All TradesYouTube · Sep 28, 2023
2. Inspect and clean the socket 

• Why: Corrosion or carbon buildup on the bulb or inside the socket can cause a poor connection.
• How:
  • Carefully remove the bulb and examine both the bulb's prongs and the inside of the socket for any signs of corrosion (green or blue residue) or damage.
  • If you find issues, clean the socket using a contact cleaner and a small, soft-bristled brush.
  • Install a new bulb and see if the flashing speed returns to normal. 

3. Replace the flasher relay 

• Why: On older cars, the flasher relay is a separate component. On newer cars, it's often integrated into the fuse block. If the relay is faulty, it can cause the fast blinking.
• How:
  • Locate the relay (check your vehicle's manual if unsure).
  • Purchase a compatible replacement relay.
  • Swap the old relay with the new one and check if the blinking speed has normalized. 

4. Address LED hyperflashing 

• Why: LED bulbs use much less power than standard bulbs, and the car's original relay may not be designed for this lower load, interpreting it as a burnt-out bulb. 
• How:
  • Replace the existing flasher relay with an LED-compatible one. 
  • Alternatively, you can use an inline load resistor kit, though this requires more complex wiring and can potentially damage the vehicle's wiring if done incorrectly. 

5. Check wiring and other issues 

• Why: Although less common, a fast-blinking turn signal could indicate a more complex wiring problem or a faulty ground connection. 
• How:
  • If the above steps don't work, have a mechanic inspect the wiring and connectors for any damage or loose connections. 

You can watch this video to learn how to diagnose other potential issues like faulty wiring: 46s1A Auto: Repair Tips & Secrets Only Mechanics KnowYouTube · May 18, 2020

Will AutoZone change a tail light bulb?

AutoZone staff may help with simple tail light bulb replacements if you purchase the bulb there, but this is not guaranteed and varies by location. For complex installations that require removing interior panels or significant disassembly, AutoZone does not provide the service and you may need to consult a mechanic. 
What AutoZone will do

• Sell you the correct bulb: Staff can help you find the right bulb for your vehicle. 
• Offer advice: They can provide step-by-step instructions or refer you to resources, such as AutoZone's DIY lighting guides. 
• Assist with easy replacements: If the bulb is easily accessible, an associate might be willing to install it for you. 

What AutoZone will not do

• Perform complex installations: They will not replace a bulb if it requires significant disassembly, such as removing interior trim or the entire tail light assembly.
• Offer full-service repair: AutoZone is a parts retailer, not a full-service repair shop, so they cannot handle complex repairs. 

Before you go

• Call ahead: It's best to call your local AutoZone to confirm if they offer assistance with simple bulb replacements and to ask about any restrictions.
• Check your owner's manual: This will give you specific instructions for your vehicle and tell you if the job is simple or requires special tools. 

Can you replace a turn signal bulb by yourself?

Yes, you can replace a turn signal bulb yourself, as it is a relatively simple task for many vehicles. However, the difficulty varies depending on the car model, with some being very accessible through the trunk or engine bay, while others may require removing more components. 
This video shows a basic turn signal bulb replacement on a Chrysler Town and Country minivan: 57sKYK CreationsYouTube · Nov 11, 2024
Steps to replace a turn signal bulb

1. Safety first: Park on a flat surface, turn the engine off, engage the parking brake, and wear safety glasses. It's also a good idea to disconnect the battery to avoid electrical shock and allow the bulb to cool down if it was recently used. 
2. Locate the bulb: Open the hood or trunk to access the back of the light assembly. The socket is usually located in the front corner of the headlight housing for the front turn signals, or in the trunk for the rear ones. 
3. Remove the old bulb: You may need to remove some interior trim or other components to get clear access. Once you can reach the socket, disconnect the wiring harness by pressing a clip and pulling it off. Then, twist the socket counter-clockwise to release it, and pull out the old bulb. 
4. Install the new bulb: Insert the new bulb into the socket, and then re-insert the socket into the housing. Turn it clockwise to lock it into place. 
5. Test and reassemble: Reconnect the wiring harness and test the new bulb to make sure it works correctly before reassembling any trim pieces you removed. 

This video shows how to replace a rear turn signal bulb: 57sTinker ForwardYouTube · Jul 18, 2020
Tips for a smooth replacement

• Refer to your manual: A vehicle-specific repair manual can help identify components and guide you through any unique procedures for your car. 
• Be careful with clips: Some trim or light housings are held by plastic clips that can easily break. Apply steady, gentle pressure and consider buying replacement fasteners beforehand. 
• Check for clearance: On some vehicles, the driver's side can be harder to access due to engine components like the battery or hoses. You may need to remove the battery or other parts to get enough room.