Facing Daytime running light failure issues in your Audi Q5 FY or SQ5 can be inconvenient, especially when your car was running fine moments before. This blog will cover the warning error code “Left Side Light Daytime Running Light Defective” in detail, providing professional insights into its causes, symptoms, and solutions. Before we head into troubleshooting the issue, it’s crucial to understand the lighting system of your specific Audi vehicle.
The Audi Q5 and SQ5, both part of the FY generation, are compact SUVs that share the Audi MLB Evo platform but offer distinct characteristics of their own. The Q5 is equipped with different engine variants, while the Audi SQ5 offers a more sporty touch with powerful acceleration that Audi fans adore.
Equally versatile, the two models feature an exceptional lighting system, including, but not limited to, daylight running lights and LED Matrix headlights, that increase road visibility, ensuring safety for both daytime and nighttime driving. Both Audi Q5 and SQ5 owners have experienced the same warning error affecting both DRLs and Matrix headlights, resorting to online forums for solutions.
To fully understand what the error means, it’s crucial to understand the potential affected components, like LED Matrix headlights and daytime running lights.
What are Audi’s LED Matrix Headlights?
A game changer in automotive lighting technology, Audi’s LED Matrix headlights can dynamically adjust specific light patterns while minimizing glare for oncoming vehicles. When faulty, these innovative lighting components can indicate a fault code like “Audi adaptive light: fault. See Owner's Manual,” which stems from a corroded light control module or damaged internal components. The same mechanism applies to daytime running lights.
What Are Daytime Running Lights?
Daylight running lights are low-wattage LED lights, located at the front of your vehicle, that automatically switch on during the day to make your vehicle visible for pedestrians and oncoming drivers. Each DRL has a specific light control module responsible for controlling its activation based on ambient light conditions.
When there’s an issue with the DRLs or the continental control module, the system will illuminate an error on the dashboard. By understanding why the error appeared in the first place, you can make an informed decision and save a fortune in the process.
What Does The “Left Side Light Daytime Running Light Defective” Warning Message Mean?
The error, “Left Side Light Daytime Running Light Defective,” explicitly states an issue revolving around the left DRL. This can cause flickering or the left DRL diode to stop functioning indefinitely until the issue is resolved.
The Most Common Audi Q5 SQ5 FY Warning Messages
- Audi adaptive light: fault. See Owner's Manual
- Front left turn signal defective. See owner's manual
- Front right turn signal defective See owner's manual
- Front left side marker light defective. See Owner's manual
- Front right side marker light defective. See Owner's manual
- Left side light daytime running light defective. See owner's manual
- Right side light/daytime running light defective. See owner's manual
The most common VW Volkswagen Touareg CR7 MK3 warning messages
- Please check left daytime running light parking light
- Please check right daytime running light parking light
- Please check left front turn signal
- Please check right front turn signal
You may observe the above-mentioned error codes, which often result from the same fault and can be resolved in the same manner. Before we head into troubleshooting the issue, it’s essential that you understand the root cause to prevent the error from reappearing.
Causes of Left DRL Failure
Daytime running lights failure can stem from various issues, like brittle wiring, burned-out LED diodes, or faulty relays. If they appear to be in perfect working conditions, the problem lies in the Continental headlamp module. Here’s a closer look at why it could’ve potentially failed:
- Finite Lifespan: The Continental light control unit module can degrade over time, like every other electronic component. This slow degradation can result from various factors, including environmental conditions, usage patterns, or potential manufacturing defects.
- External damage: Significant impact or moisture ingress can lead to premature failure of the light control module. These factors can damage the sensitive internal components of the module, rendering it unusable.
The module is responsible for managing the DRLs, including their activation, brightness, and other automatic features. Its failure can lead to the daytime running lights not functioning at all or working at irregular intervals.
This can significantly compromise overall performance and hinder safety, increasing the risk of potential accidents. The UK government has mandated the proper functioning of DRLs, risking litigation or fees upon non-compliance. Here’s what you can do to determine if the error lies in the continental light module.
Diagnosis & Troubleshooting of the Warning Error
If the DRL LED strips, wiring, and other components appear to be in perfect working condition, the issue lies in the left DRL LED control module. To resolve the problem, you can:
Purchase an authentic DRL LED control module, like the Continental Audi 80A907397D Light Control Module STD, that seamlessly integrates with your Audi Q5 and SQ5. Make sure to check the compatibility codes before making your purchase, or refer to our list, which you can find at the bottom of the page.
After replacement, diagnostic coding is required to remove the error codes. This can help clear the codes from your dashboard, resolving the issue completely. If you encounter issues during installation, contact our car technicians for expert guidance on the same day!
As your trusted car manufacturer, Xenons4U offers genuine OEM parts that are 100% authentic with free shipping. If you require other parts, excluding the Continental Audi 80A907397D Light Control Module STD, we offer reliable service with quick delivery, ensuring a 5-star customer experience.
Part Numbers & Compatibility List
This module fits a range of models, ensuring broad compatibility:
Audi part numbers
- 80A907397D
- 80A 907 397D
Continental part number:
- A2C74781014
- A2C74781009
More compatible part numbers:
- 80A907397A 80A 907 397A A2C75315714 A2C75315716
- 80A907397B 80A 907 397B A2C75315813 A2C75315808
- 80A907397C 80A 907 397C A2C75315908
Compatible Audi Q5 SQ5 FY Pre-Facelift LED Matrix Headlamps
- 80A941783F
- 80A941784F
- 80A.941.036.A
- 80A.941.036.A 80A941036A
- 6002TH0194
- 80A941035 80A.941.035
- 80A941036 80A.941.036
- 80A.941.035.A
- 80A941035A
- F00HTA700902
- LE14C6351
- 80A.941.784.A
- 80A941784A
- LE14A6351
- F00HTA901400
Compatible cars:
- Audi A8 D5 4N 2017 2018 2019 2020
- Audi Q5 SQ5 FY Sportback Pre-Facelift
- 2016 2017 2018 2019 2020
- S-Line Quattro
- VW Volkswagen Touareg CR7 MK3 III
- 2018 2019 2020
- 3.0 TDI diesel
- R-Line
