How to Fix Failing DRLs on Your 2013-2018 Audi Q5: Replace the Light Guide & LED Board

TL;DR

If your 2013-2018 Audi Q5 has a dim or completely dead daytime running light (DRL), the most common culprit is the internal LED board or the light guide strip that distributes the light. You don't need to replace the entire headlight assembly; installing a new [Audi Q5 DRL Light Guide Strip & LED Board (2013-2018)] can restore that distinctive LED signature at a fraction of the cost. Expect the replacement to take around 2-3 hours if you're handy with tools.

What Goes Wrong With the DRL on the Audi Q5

The Audi Q5's DRL is a light guide strip paired with an LED board, a system where LEDs shine into a clear acrylic guide that distributes light evenly. Over time, the LEDs can fail (often one or two at a time), or the light guide can become discolored or cracked due to heat and UV exposure. In many cases, the LED board itself degrades, leading to a dim, flickering, or completely dark DRL. This is a known issue on the 2013-2018 Q5, with some owners reporting failures as early as 40,000 miles.

Diagnose: Is It the LED Board or the Light Guide?

Before ordering parts, confirm the issue. Remove the headlight assembly (you'll need to access the back cover) and inspect the DRL module. If the LED board is visibly burnt or has cold solder joints, that's your problem. If the board looks fine but the light output is uneven or faint, the light guide may be the issue. A simple test: swap the headlight with the other side to see if the problem follows—if it does, it's the board; if not, it's the guide. On this vehicle, the board and guide are designed to work as a unit, so replacing both together is recommended for a consistent result.

Step-by-Step Replacement Guide

1. Disconnect the battery and remove the headlight assembly from the vehicle (refer to your owner's manual or online guides for specific bolt locations). 2. Remove the headlight's back cover and any connectors to access the DRL module. 3. Take out the old light guide and LED board—they are typically clipped or screwed into a housing. Carefully note how they sit. 4. Install the new [Audi Q5 DRL Light Guide Strip & LED Board (2013-2018)], ensuring the guide seats firmly and the board connectors align. 5. Reassemble the headlight, reconnect the battery, and test the DRLs before reinstalling the headlight into the car. 6. Adjust the headlight alignment if needed after installation.

Fix vs Replace

When DRLs fail on the Q5, some dealerships recommend replacing the entire headlight assembly, which can cost $1,200–$2,500 per side. In contrast, replacing just the light guide and LED board is a fraction of that cost—typically $100–$200 for the parts. Install time is roughly 2-3 hours versus 1-2 hours for a full assembly swap, but you get to keep your original housing and lens, which is better for resale value and avoids the risk of aftermarket alignment issues.

Why This Part Restores Your Q5's Look

The new light guide and LED board are designed to match the original brightness and color temperature, so your Audi looks factory-fresh. Replacing just the guide and board keeps the original headlight housing, its seal and its factory fit — the cost-effective fix on a Q5.

FAQ Q: Both Q5 DRLs went dark at the same time - do I need two boards? A: Boards rarely fail simultaneously, so when both sides die together the fault is usually upstream: the DRL fuse, the control module, or the wiring between them. Check the fuse first (the owner's manual lists the slot), then the module. Only replace the boards once the shared parts test fine. Q: There is moisture inside my Q5 headlight - will a new board survive it? A: Not unless you deal with the moisture first. Water ingress is what usually kills the board, so dry the housing completely, replace the butyl seal and check the vent caps, then fit the new board. A cracked lens means the assembly itself is due.

Standards reference: for the Audi Q5, the daytime running lamp is governed by UN ECE Regulation 148 (which superseded R87) in most markets and by FMVSS 108 in the United States - these define when the lamp runs and at what output. Fitting the new board or guide brings the lamp back to its regulated function.

Q: Can I replace just the LED board without the light guide?\nA: Yes, but if the guide is discolored or scratched, the light output will still look uneven. It's best to replace both together for a uniform beam.

Q: How long does the replacement last?\nA: The LED board is rated for up to 50,000 hours, which is roughly 10 years of normal driving.

Q: Is this a DIY job for a beginner?\nA: It requires moderate mechanical skill because you need to remove the headlight assembly. If you're not comfortable, a shop can do it in about 2 hours.

Q: Will this fix the 'LED DRL malfunction' warning on my dashboard?\nA: Yes, if the warning is due to a failed LED board, replacing it will clear the error.

Standards & further reading

Reference material for the standards and technology that govern vehicle lighting equipment:

• FMVSS No. 108 - Lamps, reflective devices, and associated equipment - the US federal standard governing vehicle lighting equipment - ams OSRAM - automotive lighting - light-source and LED technology reference - HELLA - automotive lighting and electronics - vehicle lighting systems reference