The Alfa Romeo Giulietta 940 is an exceptional hatchback model, offering a practical combination of comfort, sportiness, and affordability. The model features an all-new platform striking a unique balance between efficiency and power, making it suitable for both daily city commutes and rigorous road handling. Over the years, the model has undergone various facelifts, featuring turbo-four, petrol, and diesel engines with ample horsepower. 

While renowned for its notable sporty exterior and high performance, the car might experience some issues. Many Alfa Romeo Giulietta 940 owners have reported technical issues, with a majority of these problems centred around daytime running light (DRL) failure. If you have “Check Daytime Running Lights” illuminating on your dashboard, this blog provides an in-depth explanation of DRL failure and how to resolve the issue.

Before we head to solutions, let’s start by understanding what daytime running lights are. 

What are Daytime Running Lights? 

Daytime running lights are low-wattage lights controlled by a dedicated DRL module. You’ll find these lights positioned near or below the headlamps, depending on the model. Unlike Xenon headlamps, DRLs do not illuminate the road; rather, they help make your vehicle visible to oncoming traffic or pedestrians. 

A study revealed a substantial decrease in accidents due to the effectiveness of daytime running lights. In recognition of their safety benefits, the UK government mandated daytime running lights as an essential component for all vehicles developed after 2011. DRLs are typically automated; however, you can manually enable and disable them on the Alfa-Romeo Giulietta 940. 

What Does “Check Daylight Running Lights” Warning Message Mean?

The error “Check Daylight Running Light” typically indicates that there’s an issue with DRLs or the overall DRL lighting system. For any of the issues, you’ll come across the warning error flashing on your dashboard: 

Check Daytime Running Lights
Check Daytime Running Lights Warning Message

The most common Alfa Romeo Giulietta 940 warning messages:

  • Check Daytime Running lights.

Before we rectify the problem at hand, let’s examine the causes of DRL failure to prevent the issue from recurring. 

Causes of Daytime Running Light Failure Warning Message

The main culprit behind daytime running light failure is often the headlight control module, which is responsible for controlling the bulbs, including their activation and brightness. If it’s faulty, the bulb will not ignite, resulting in the warning error. Head-on collisions or minor impacts can damage the internal components, resulting in malfunction or wiring issues. 

Other potential causes of the DRL warning message can include LED DRL diode failure, moisture intrusion, or a case of a bad fuse or faulty wiring. If you are unable to find the cause, it’s best to take your vehicle to a qualified mechanic or use an OBD2 scanner to diagnose the issue. 

Diagnosing & Troubleshooting DRL Failure on Alfa Romeo Giulietta 940 

There are two ways to diagnose the DRL warning error:

  • First, remove the bulb from the socket and inspect it closely for any visible signs of damage, such as a burnt-out filament or a darkened bulb. If your bulbs appear fine, there might be an issue with the DRL module. 
  • To verify whether the problem lies in the DRL module, swap the left and right modules. If the error shifts, the issue lies within the DRL module and can be resolved with a new component. 

Another method to diagnose the problem is by using a scanner that can pull out codes, pinpointing the exact problem. You’ll see any one of the following diagnostic codes:

The most common diagnostic trouble fault codes

  • B100A96 Front right parking light feedback Component internal failure
  • B100B96 Day Running Light Feedback Component Internal Failure
  • B109029 Front Light Unit (FLU) Feedback Signal Signal invalid

If you have successfully diagnosed that the problem lies within the DRL module, a replacement can resolve the error. Our 130732928400 10EEG090142 77367886 LED Module is compatible with various models, including the Alfa-Romeo Giulietta 940. 

Before purchasing a new module, ensure that the part numbers of both the faulty module and the new DRL headlight module are aligned. Minimal diagnostic coding is required to erase the warning message from your dashboard. Without it, the warning message will continue to appear, although the error has been resolved. 

If you encounter any difficulties or require further assistance to complete your installation, please contact our specialists for a same-day response. If you’re looking for something else, Xenons4U is a trusted car manufacturer, offering prompt and efficient service to drivers and car enthusiasts in the UK and beyond. 

Part Numbers & Compatibility List

This module fits a range of models, ensuring broad compatibility: 

AL part numbers

  • 130732928400
  • 10EEG090142

Alfa-Romeo part number

  • 0077365494-001
  • 77367886
  • 0077367886
  • 0077367886-01
  • 68336041AA-001
  • 0077367886-001

Compatible Alfa-Romeo Giulietta 940 Xenon headlamps

  • 00505202300
  • 50520230
  • 00505387730
  • 505387730
  • 00505387740
  • 505387740
  • 0050538773
  • 50538773

Compatible cars

  • Alfa Romeo Giulietta 940
  • 2010 2011 2012 2013 2014 2015 2016
  • 1.6 2.0 JTDM
  • Speciale Veloce
  • Alfa Romeo Mito
  • Maserati Granturismo S 2014 2015