How to Install CSL Yellow DRL Modules on Your G80 M3 & G82 M4

One of the most dramatic cosmetic modifications you can make to your G80 M3 or G82 M4 is upgrading the daytime running lights (DRLs) to the iconic CSL-style yellow. This single change gives your car the aggressive, motorsport-inspired look of BMW's most exclusive models.

While the concept is plug-and-play, the installation process requires some patience. This comprehensive guide will walk you through the most common DIY method, ensuring you have the confidence to transform your car's road presence.

Table of Contents

  • Is This Mod Right for You? (Skill, Time, Access)

  • Tools & Parts Needed

  • Step-by-Step Installation Guide

  • The Final Result

  • Frequently Asked Questions (FAQ)

Is This Mod Right for You?

  • Skill Level: Intermediate. You should be comfortable with lifting your car and removing wheels and trim panels.

  • Time Estimate: 2-3 hours.

  • Important Note on Access: Unlike older BMWs, accessing the DRL modules on the G8X platform is involved. This guide follows the most common method, which requires removing the front wheels and fender liners. While it takes time, it avoids removing the entire front bumper.

Tools & Parts Needed

Required Tools:

  • Floor Jack & Jack Stands

  • Wheel Chocks

  • Breaker Bar & 17mm Socket (for wheel lugs)

  • Wheel Lock Key (if applicable)

  • Ratchet with 8mm & 10mm Sockets

  • Torx Bit Set (T20 is essential)

  • Plastic Trim Removal Tool Kit

  • Torque Wrench

Required Parts:

Step-by-Step Installation Guide

We'll start with the passenger side, as it's slightly easier.

  1. Lift & Secure the Vehicle: Park on a level surface. Loosen the front lug bolts, then lift the front of the car and secure it safely on jack stands. Chock the rear wheels.

  2. Remove the Wheel & Fender Liner: Remove the front wheel. Now, use your 8mm and 10mm sockets and trim removal tools to remove all the bolts and plastic clips holding the fender liner in place. Carefully pull the liner out to expose the back of the headlight assembly.

  3. Locate the DRL Module: Look at the bottom of the headlight housing. You will see a small, silver metal heatsink with fins held in by two Torx screws. This is the OEM DRL module you need to replace. [Image showing the fender liner removed, with an arrow pointing to the DRL module on the bottom of the headlight]

  4. Remove the OEM Module: Using a T20 Torx screwdriver, carefully remove the two screws holding the module in place. Once the screws are out, the module can be unplugged and removed. It may be a tight fit, so be patient.

  5. Install the BayOptiks CSL Module: Before installing, apply the included thermal paste to the back of the new BayOptiks CSL Yellow DRL module. This is critical for proper heat dissipation. Carefully slide the new module into place, plug in the connector, and secure it with the two T20 Torx screws.

  6. Test Before Reassembly! At this point, lower the car just enough to reconnect the battery (if you disconnected it) and turn on the car's daytime running lights. Confirm that the new DRL is illuminating yellow.

  7. Reassemble: Reinstall the fender liner and the wheel. Lower the car fully, and use your torque wrench to tighten the lug bolts to the factory spec (140 Nm / 103 ft-lbs).

  8. Repeat for the Driver's Side: The process is identical for the driver's side.

The Final Result

The aggressive, CSL-inspired look is unmistakable and gives your M3 or M4 a commanding road presence, day or night.

[Stunning before-and-after slider image showing the white DRLs vs. the new yellow DRLs]

Ready to Unlock the CSL Look?

This plug-and-play module kit is the easiest and most effective way to get the iconic yellow DRLs for your G8X.

Frequently Asked Questions (FAQ)

  • Will this upgrade void my car's warranty? As a plug-and-play cosmetic part, it generally does not void your vehicle's warranty. However, warranty coverage on the headlight assembly itself could be affected. We always recommend checking with your specific dealership.

  • Are yellow DRLs legal? Regulations for daytime running light colors vary by state and country. These modules are typically sold for off-road or show use. Please check your local vehicle laws.

  • Do I need to do any coding? No. These modules are 100% plug-and-play and require no vehicle coding. They will not throw any error codes.

 

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