2020 Toyota Tacoma Lights Not Working? DIY Fix Guide

How to Fix Lights-Related Issues on Your 2020 Toyota Tacoma

This guide addresses lights-related concerns specific to the 2020 Toyota Tacoma. Issues can range from aftermarket light installations to concerns about visibility and legality. As one 2020 Toyota Tacoma owner shared: "You will actually get pulled over and given a warning in the northeast for this (lights on vehicle)" (source). We'll cover common issues, potential causes, and practical solutions based on the experiences of fellow Tacoma owners.

Symptoms

The symptoms related to lights issues on your 2020 Toyota Tacoma can vary significantly depending on whether the problem stems from factory lighting, aftermarket additions, or wiring malfunctions. Owners report a spectrum of experiences, ranging from aesthetic modifications to functionality concerns and even legal issues. Some owners focus on aesthetics, like adding aftermarket lights for a more aggressive look.

Some owners describe upgrading their existing lights. For example, one owner mentioned: "New Alpharex lights are 🔥 Just installed and it just gives my trd off-road more aggressive look." (source) These upgrades often involve replacing headlights and taillights with LED versions for improved brightness and a modern appearance.

However, installing aftermarket lights is not without its potential issues. Incorrect wiring, improper mounting, or even the selection of overly bright lights can lead to problems. Some owners express concerns about the appearance of aftermarket lights. One owner stated: "Those lights look terrible for my taste. If it was really needed I'd do a super bright light bar in the grill." (source).

Beyond aesthetics, legality is also a factor. As one owner pointed out, modifications can attract unwanted attention from law enforcement: "You will actually get pulled over and given a warning in the northeast for this (lights on vehicle)" (source). This underscores the importance of understanding local regulations before making significant changes to your truck's lighting system.

Most Likely Cause

Based on owner reports and discussions, the primary cause of lights-related issues often stems from the installation and integration of aftermarket lighting, particularly roof rack mounted lights or ditch lights. While factory lighting systems are generally reliable, modifications introduce potential points of failure, including wiring errors, improper mounting, and incompatibility with the vehicle's electrical system. The addition of a roof rack can complicate wiring, as it requires routing wires from the lights down to the vehicle's electrical system.

How to Diagnose

Diagnosing lights-related issues requires a systematic approach. Start by visually inspecting all lights, both factory and aftermarket, to identify any that are not functioning correctly. Check for blown bulbs, damaged lenses, or loose connections. A multimeter is essential for testing voltage and continuity in the wiring.

Here's a step-by-step diagnostic process:

1. Visual Inspection: Check all bulbs, lenses, and wiring for damage.
2. Fuse Check: Inspect the relevant fuses in the fuse box. A blown fuse is a common cause of lighting problems.
3. Wiring Inspection: Look for loose connections, frayed wires, or signs of corrosion, especially around aftermarket light installations.
4. Grounding Check: Ensure that all ground connections are secure and free from corrosion. Poor grounding can cause a variety of electrical issues.
5. Voltage Testing: Use a multimeter to check for voltage at the light socket. If there is no voltage, trace the wiring back to the power source to identify the break.
6. Continuity Testing: Use a multimeter to check for continuity in the wiring. This will help you identify any breaks or shorts in the circuit.
7. Relay Check: If the lights are controlled by a relay, test the relay to ensure that it is functioning correctly.
8. Harness Inspection: Inspect any wiring harnesses, especially those associated with aftermarket lights, for damage or corrosion. One owner highlighted the importance of waiting on a harness to install the headlights: "Picked up TRD Pro LED headlights and taillight housings and some Diode Dynamics SS3 Max in yellow. Just waiting on a harness to install the headlights" (source.

Tools Needed:

• Multimeter
• Wire stripper/crimper
• Electrical tape
• Screwdrivers
• Socket set
• Test light

Step-by-Step Fix

The following steps outline how to address common lights-related issues, focusing on aftermarket installations:

1. Disconnect Power: Before starting any work, disconnect the negative terminal of the battery to prevent electrical shock.

2. Inspect Wiring: Carefully examine the wiring for any signs of damage, such as frayed wires, loose connections, or corrosion. Pay close attention to areas where the wiring may have been pinched or rubbed against sharp edges.

3. Repair Wiring: If you find any damaged wires, repair them using wire strippers, crimpers, and electrical tape. Ensure that all connections are secure and properly insulated.

4. Secure Connections: Double-check all connections to ensure that they are tight and corrosion-free. Use dielectric grease to protect connections from moisture and corrosion.

5. Check Grounding: Verify that all ground connections are secure and properly grounded to the vehicle's chassis. A poor ground connection can cause a variety of electrical problems.

6. Test Fuses: Inspect the fuses related to the lighting system. Replace any blown fuses with the correct amperage rating.

7. Reinstall Bulbs: If you removed any bulbs during the inspection process, reinstall them, making sure that they are properly seated in the sockets.

8. Test Lights: Reconnect the battery and test all of the lights to ensure that they are functioning correctly.

9. Adjust Aim: If necessary, adjust the aim of the headlights to ensure that they are properly aligned and do not blind oncoming traffic.

10. Secure Wiring: Use zip ties or other fasteners to secure the wiring and prevent it from rubbing against sharp edges or interfering with other components.

"It’s Everything I expected," one owner said about the lights they installed (source). Ensure your expectations are aligned with careful installation and adherence to safety guidelines.

Parts and Tools Needed

• Replacement Bulbs: Varies depending on the specific lights. Consult your owner's manual or the bulb itself for the correct part number.
• Wiring Harness: If installing aftermarket lights, a quality wiring harness is essential. Choose a harness that is specifically designed for your vehicle and the type of lights you are installing.
• Fuses: A selection of fuses in various amperage ratings.
• Electrical Tape: For insulating and protecting wire connections.
• Dielectric Grease: For protecting electrical connections from moisture and corrosion.
• Zip Ties: For securing wiring.
• Multimeter: For testing voltage and continuity.
• Wire Stripper/Crimper: For repairing and modifying wiring.
• Screwdrivers: For removing and installing screws.
• Socket Set: For removing and installing bolts.

Real Owner Costs

The cost of addressing lights-related issues can vary widely depending on the nature of the problem. Simple repairs, such as replacing a blown bulb or tightening a loose connection, can be done relatively inexpensively. However, more complex repairs, such as rewiring an aftermarket lighting system or replacing a damaged wiring harness, can be significantly more expensive.

DIY Costs:

• Replacement Bulbs: $5 - $20 per bulb.
• Electrical Tape: $5 - $10.
• Dielectric Grease: $5 - $10.
• Fuses: $5 - $10.
• Wiring Connectors: $10 - $20.

Professional Repair Costs:

• Diagnostic Fee: $75 - $150.
• Wiring Repair: $100 - $300.
• Wiring Harness Replacement: $200 - $500.
• Aftermarket Light Installation: $150 - $400.

One owner touted the quality and brightness of their lights stating: "The quality is top and the brightness is ridiculous." (source. While quality often comes with a higher upfront cost, it can prevent future issues.

Prevention

Preventing lights-related issues involves regular maintenance and careful installation practices, especially when dealing with aftermarket lighting.

• Regular Inspections: Periodically inspect all lights and wiring for damage or corrosion.
• Proper Installation: When installing aftermarket lights, follow the manufacturer's instructions carefully and use high-quality wiring harnesses and connectors.
• Secure Wiring: Ensure that all wiring is properly secured and protected from rubbing against sharp edges.
• Use Dielectric Grease: Apply dielectric grease to all electrical connections to prevent moisture and corrosion.
• Avoid Overloading Circuits: Do not overload the vehicle's electrical circuits by adding too many aftermarket lights.
• Professional Installation: If you are not comfortable working with electrical systems, have aftermarket lights installed by a qualified professional.

What Owners Say

Real experiences from TOYOTA owners:

Owner Experiences

"Mines the one on the right, but had to get a pic of those sweet prerunner build. The wide body and the KC lights with the front bumper just looks so cool." — thePunisher1220 (source)

"Meh I had ditch lights on my last truck and realized they were kind of pointless. Haven’t put them on my new truck and don’t plan on it" — Possible-Material693 (source)

"New Alpharex lights are 🔥 Just installed and it just gives my trd off-road more aggressive look." — FitSwing2423 (source)

Lessons Learned

⚠️ "You will actually get pulled over and given a warning in the northeast for this (lights on vehicle)" — HardyPancreas (source)

FAQ

Q: How long does it take to fix a lights issue?

A: The time required to fix a lights issue can vary depending on the complexity of the problem. Simple repairs, such as replacing a bulb, can be done in a few minutes. More complex repairs, such as rewiring an aftermarket lighting system, can take several hours.

Q: Can I drive with a lights issue?

A: Driving with a lights issue can be dangerous and is often illegal. If your headlights or taillights are not functioning properly, you should not drive the vehicle until the problem has been resolved. Some states have specific laws regarding auxiliary lighting, so ensure that all aftermarket lights are properly installed and compliant with local regulations.

Q: Is this a common issue on the 2020 Toyota Tacoma?

A: Lights-related issues are not uncommon on the 2020 Toyota Tacoma, especially when aftermarket lights have been installed. Many owners choose to upgrade their truck's lighting system for aesthetic or functional reasons, but improper installation can lead to problems.

Q: DIY vs mechanic - what's recommended?

A: Whether to DIY or hire a mechanic depends on your comfort level and experience with electrical systems. If you are comfortable working with wiring and have a good understanding of electrical circuits, you may be able to handle simple repairs yourself. However, if you are not comfortable working with electrical systems or if the problem is complex, it is best to hire a qualified mechanic. Incorrect wiring can lead to further damage and potential safety hazards.