What is the DRL light on an Acura MDX?

The DRL light on an Acura MDX is an indicator that alerts the driver to the status of the vehicle's daytime running lights (DRLs). DRLs are automatic headlights that turn on when the engine is running, providing increased visibility and safety for other drivers on the road.

What is the DRL Light?

The DRL light is a dashboard indicator light that illuminates when the daytime running lights are activated on an Acura MDX. This light serves as a visual confirmation that the DRLs are functioning properly. The DRL light is typically a green or amber-colored indicator, and it will remain lit as long as the DRLs are turned on.

Why is the DRL Light Important?

The DRL light is an important feature for Acura MDX owners because it helps them ensure that their vehicle's daytime running lights are working correctly. Daytime running lights are designed to improve the visibility of a vehicle, making it easier for other drivers to see and potentially preventing accidents. If the DRL light is not illuminated, it could indicate a problem with the DRL system, which should be addressed by a qualified mechanic.

Troubleshooting the DRL Light

• If the DRL light is not illuminated when the engine is running, check the DRL fuse and replace it if necessary.


• If the DRL light is flashing, it could indicate a problem with the DRL system, such as a faulty bulb or wiring issue. In this case, it's best to have the vehicle inspected by a qualified mechanic.


• If the DRL light is staying on constantly, even when the DRLs are not in use, there may be an issue with the DRL control module or a wiring problem.

Addressing any issues with the DRL light promptly is important to ensure the safety and proper functioning of your Acura MDX.

How to turn off DRL on Acura MDX?

You cannot permanently turn off the daytime running lights (DRLs) on an Acura MDX, as they are required by law and designed to be on automatically. The lights will turn off when the headlights are manually turned on or when the light switch is in the "AUTO" position and it gets dark. However, you can temporarily turn them off by putting the car in Accessory mode (engine off), engaging the parking brake, and turning the light switch to the "OFF" position. 
Temporary solution to turn off DRLs 

• Engage the parking brake. 
• Turn the vehicle off. 
• Turn the light switch to the "OFF" position.
• Start the car in Accessory mode: (press the ENGINE START/STOP button once without your foot on the brake). The DRLs should remain off as long as the parking brake is engaged. 

How DRLs work automatically

• The DRLs operate automatically when the ignition is on. 
• They will turn off once you turn on the headlights manually or when the light switch is in the "AUTO" position and it detects low light conditions. 

Alternative method (not recommended)

• Some owners have found success by temporarily disabling the DRL fuse, but this is not recommended as it can cause a warning light to illuminate on the dashboard and is a permanent modification that may affect other systems. 

What causes the DRL light to come on?

The DRL (daytime running light) light comes on when there's a problem with the system, which is most commonly caused by a burned-out bulb, a blown fuse, or issues with the wiring and electrical connections. Other less common causes include a malfunctioning ambient light sensor or a faulty control module, which the vehicle's computer can detect, triggering the warning light. 
This video explains what the DRL system is and how to fix the warning light: 1mAnother LapYouTube · Feb 20, 2025
Common causes

• Burnt-out bulbs: This is one of the most frequent reasons for the DRL light to come on. The warning light often indicates that a bulb has failed. 
• Blown fuse: A blown fuse can interrupt the power supply to the DRLs, causing the light to illuminate. 
• Wiring and connection problems:
  • Damaged wires: Frayed or damaged wires can disrupt the electrical flow to the DRLs. 
  • Corrosion: Corrosion on the connectors can cause a poor connection and trigger the warning light. 
• Faulty sensors: Some DRL systems are controlled by an ambient light sensor. If this sensor malfunctions or gets dirty, it can incorrectly report a problem, causing the DRL light to turn on, especially during daylight hours. 
• Control module or relay issues: Problems with the DRL control module or a faulty relay can cause the system to malfunction, and the vehicle's computer will often detect this and turn on the warning light. 
• Incorrect LED bulb installation: If you've recently switched to LED bulbs, the system may trigger the warning light because LEDs use less power and the computer interprets this as a bulb failure. 

This video explains how to diagnose DRL problems: 44s1A Auto: Repair Tips & Secrets Only Mechanics KnowYouTube · Jun 9, 2021
What to do

• First, check the bulbs: Inspect all DRL bulbs to see if any are burnt out. Replacing a burnt-out bulb is often the simplest fix. 
• Check for simple issues: Make sure the light sensor isn't blocked or dirty. Also, check the fuses related to the DRL system. 
• Use a scan tool: If the problem isn't obvious, a mechanic can use a diagnostic scan tool to pull up error codes, which can pinpoint the exact issue in the system. 
• Consult a mechanic: If you've checked the basics and the light is still on, it's best to have a professional diagnose and fix the problem to ensure the system is working correctly and safely. 

What is DRL in Acura MDX?

The Acura MDX DRL (Daytime Running Light) system is a lighting system that turns on automatically when the engine is on and the parking brake is released. The system is designed to make the vehicle more visible during the day. When the system has a problem, a "Check DRL System" warning message may appear on the dashboard. The most common cause of this error is a burnt-out bulb. 
Troubleshooting the DRL system

• Check the bulbs: The most frequent cause of a DRL warning is a burned-out bulb. 
• Check the fuse: Locate the DRL fuse and relay in the under-hood fuse box and check for any issues. 
• Inspect wiring: Examine the wiring harnesses for corrosion or damage, particularly near the headlight assembly. 
• Reset the module: Disconnecting the car battery for a few minutes may resolve the issue by resetting the DRL module. 

Replacing the DRL bulb

• Identify the correct bulb: The Acura MDX typically uses a 9005 bulb for its DRLs. 
• Access the bulb: The bulb can be accessed through an access panel below the light or by reaching through the wheel well. 
• Remove the old bulb: Turn the bulb a quarter turn to the left to unlock it, then pull it out. 
• Install the new bulb: Place the new bulb in the socket and turn it a quarter turn to the right to lock it in place. 
• Test the light: Before reassembling, test the new bulb to ensure it is working and the "Check DRL System" message is gone. 
• Reassemble the parts: Reinstall the access panel or other components in the reverse order of removal. 

This video shows how to replace the DRL bulb on an Acura MDX: 59sV.I.P. HoldingsYouTube · Aug 3, 2024
When to seek professional help

• If the DRL warning continues to appear after replacing the bulb, there may be a faulty DRL relay, fuse, or the DRL module itself.
• A mechanic can use a multimeter to verify the voltage at the socket. 

This video demonstrates how to replace the DRL light on an Acura MDX: 1mJust A Dad VideosYouTube · Nov 6, 2020

Should I have DRL on or off?

Yes--turning headlights on during the day is generally recommended in many situations. Daytime running lights (DRLs) or low-beam headlights improve your vehicle's visibility to others and cut crash risk, especially in conditions where contrast or attention is reduced.