Switchable White / Yellow DRL Modules — BMW 1 Series F20/F21 LCI
The CSL Yellow Signature on Your Factory LED Headlights — Bolt-In Module Set — No Coding, Fully Reversible — 2015–2019
BMW 1 Series • F20 5-Door • F21 3-Door • LCI (2015–2019) • Adaptive LED (552) • LED Headlights (5A2) • OEM Ref 63117428425
The yellow DRL is the fastest way to make a BMW look like it means something — the CSL-style signature people expect on an M car with a motorsport badge. This set puts it on the headlights your F20 already has. No new headlights, no coding, no cut wires: the ELERON modules bolt onto the factory mounting points inside your LED headlights, and an inline control box lets you switch between clean white and CSL yellow from the driver's seat — or set Auto mode once and let the DRL follow your low beams, yellow by day, white when the beams come on.
One set covers both headlights, and it fits every full-LED 1 Series facelift: F20 five-door and F21 three-door, built 2015–2019, with Adaptive LED (option 552) or LED headlights (option 5A2) — the same coverage as BMW's own module set, OEM reference 63117428425. And because the ELERON modules replace the factory ones outright, they're also the fix if one of your original DRL modules has already failed.
Quick Facts
| Fits | BMW 1 Series F20 (5-door) & F21 (3-door) LCI, 2015–2019, with factory LED headlights — Adaptive LED (552) or LED (5A2) |
|---|---|
| Does not fit | Halogen headlights · pre-LCI (2011–2015) cars |
| OEM reference | 63117428425 (Set, LED modules) |
| In the box | DRL modules for both headlights · inline control box · mounting tape |
| DRL colors | White (~6,000K) / Yellow (~3,000K) — 3× stalk toggle, plus Auto, Strobe & Breathing modes |
| Coding | None. No dashboard errors, welcome light preserved |
| Install | Bolt-in on factory mounting points, ~1.5–2 hours, basic hand tools |
| Reversible | Fully — factory modules come out intact, harness never cut |
| Warranty | 2 years |
Is This Your Headlight?
One set fits both factory LED headlight options on the F20/F21 LCI — Adaptive LED (552) and LED (5A2). The two look identical from the outside; the only difference is behavior, not appearance — adaptive beams swivel with steering. Same DRL module either way, nothing to select.
F20/F21 LCI "Icon" LED Headlight
Adaptive LED (552) & LED (5A2) — 2015–2019. Both use this module.
Not compatible: halogen headlights, and pre-LCI (2011–2015) cars — those use a different light setup entirely.
Not sure which headlights your car has?
Send us your VIN and we'll confirm in minutes. Contact us here →
How It Works
Your factory DRL is driven by small LED modules bolted inside each headlight. This set replaces those modules with ELERON dual-color units — finished assemblies, LED board bonded to its own aluminum heatsink — on the exact same mounting points, using the original screws. A compact control box then sits inline in the headlight harness — the car-side connector plugs into the box, the box plugs into the headlight, factory male/female connectors on both ends. Nothing is cut, nothing is spliced.
The modules draw the same current and speak the same signals as the factory DRL, so the car sees nothing unusual: no dashboard warnings, no flicker, and the welcome-light sequence plays exactly as before.
Why the inline box existsThe stalk-switching logic has to live somewhere, and putting it inside the headlight would mean baking the housing open. The inline box is what keeps this a bolt-and-plug install — it's the part that reads your high-beam stalk and tells the modules which color to run. Stick it anywhere convenient in the engine bay with the supplied tape, away from direct exhaust-manifold heat. (Our complete headlight units carry this logic built in — no box needed there.)
Five modes · One stalk · No app
DRL Control
Every mode switches from your factory high-beam stalk with low beams off. Your selection persists through ignition cycles.
-
3×Manual Toggle
Switches between solid White and solid Yellow. Stays set until you change it — through ignition cycles too.
White ~6,000K⇄Yellow ~3,000K CSL -
5×Auto Mode Eleron Exclusive
The DRL follows your low beams — set it once and never touch the toggle again. The same day/night behavior logic as the OEM CSL cars.
Beams off → YellowBeams on → White -
7×Strobe
A left-right progressive strobe in your current color; flash 7× again to strobe the other color. Strictly for a parked car on private ground — flashing forward lights are illegal on public roads in most countries.
Show mode · private ground only -
11×Ambient Breathing
A slow, subtle pulse — the DRL dims in and out. Best at idle or parked at a meet.
dim … bright … dim -
9×Reset
Returns the module to factory White and clears all mode settings — your undo button.
↺ back to factory White
Engineered to Stay on the Car
Zero Coding, Zero Errors
The modules draw the same current and speak the same signals as the factory DRL, so the car's diagnostics stay clean — no coding, no dashboard warnings, no flicker. The welcome-light sequence is preserved. Plug in, bolt down, done.
Fully Reversible — OEM Stays OEM
Your factory modules come out intact, and the harness is never cut or spliced — the inline box uses factory connectors on both sides. Bolt the originals back in for a lease return, a sale, or a dealer visit: same screws, no residue, no trace.
The CSL Yellow — On Factory Headlights
The switchable yellow DRL signature usually means buying complete aftermarket headlights. This set delivers it inside the LED headlights your car came with — run the clean factory white day to day, flick to yellow when the occasion suits.
Bolt-In on Factory Mounting Points
The ELERON modules mount exactly where the originals sit, secured with the original screws. No adapters, no drilling, no glue — a like-for-like mechanical fit, matching OEM set 63117428425.
Matched Pairs — Binned Together
Left and right modules are color-matched at QC before they ship, so your DRLs read identical side-to-side. Cheap imports often mix LED bins — one headlight slightly warmer than the other — and once you've noticed the difference, you can't un-notice it.
Factory Functions Untouched
The DRL is its own circuit. Adaptive swiveling on 552 cars, high-beam assistant, and the welcome-light sequences all keep working exactly as BMW designed — the modules and box never touch those systems.
2-Year Warranty
Two years of coverage from delivery date.
Installation
A bolt-and-plug job with basic hand tools (T20/T25 Torx, 8/10 mm sockets, trim tool). Typical time: 1.5–2 hours for both sides. A shop will quote 1–2 hours of labor.
- Gain access to the back of each headlight. On the F20/F21, the cleanest route is removing the front wheel and wheel-arch liner on each side; taking the front bumper off gives the most working room.
- Disconnect the factory DRL connector and unbolt the OEM module.
- Bolt the ELERON module in its place using the original screws — same mounting points.
- Seat the control box inline in the headlight harness: the car-side connector plugs into the box, and the box plugs into the headlight. Factory connectors on both sides — nothing is cut or spliced.
- Mount the box anywhere convenient in the engine bay with the supplied double-sided tape, away from direct exhaust-manifold heat.
- Test before closing up — verify the 3× White/Yellow toggle and the 5× Auto mode, plus the welcome light.
- Refit the liner (or bumper) and wheel.
Frequently Asked Questions
Yes — that's exactly what this set is. The ELERON modules replace the factory DRL modules inside your existing LED headlights, giving you a switchable White/Yellow signature with no headlight swap, no coding, and no cut wiring.
BMW 1 Series F20 (5-door) and F21 (3-door) facelift (LCI), built 2015–2019, with factory full-LED headlights — either Adaptive LED (option 552) or LED headlights (option 5A2). One set covers both headlights. It does not fit halogen headlights or pre-LCI (2011–2015) cars.
You can't from the outside — the two headlights look identical. The difference is behavior: adaptive beams swivel with the steering at night, non-adaptive beams stay fixed. For this product it doesn't matter — the same module set fits both. If you're curious which your car has, send us your VIN.
If the fault is a failed DRL module — the usual cause when a ring goes dark and the dash shows a daytime-running-light warning — then yes. These replace the factory modules outright, so a dead OEM module leaves the car with the fault gone and the White/Yellow switching gained. If you suspect wiring damage rather than the module, send us your VIN and symptoms first.
No. The modules draw the same current and speak the same signals as the factory DRL, so there are no dashboard warnings and nothing to code. The welcome light works as before.
Yes. The DRL is a separate circuit — adaptive swiveling, high-beam assistant, and the welcome-light sequences all continue working exactly as BMW designed.
Fully reversible. Your factory modules come out intact and the harness is never cut — the inline box uses factory connectors on both sides. Bolt the OEM modules back in with the same screws and the car is exactly as it left the factory.
It's the small unit that reads your high-beam stalk flashes and tells the modules which color to run. The logic has to live somewhere, and building it into the headlight would mean opening the housing — the inline box is what keeps this a bolt-and-plug install. It sits in the harness on factory connectors and mounts in the engine bay with the supplied tape.
From the driver's seat, with low beams off: flash the high beams 3 times to toggle between White and Yellow. Five modes total — 5× activates Auto, 7× Strobe, 11× Ambient Breathing, and 9× resets to factory White. Your selection is remembered through ignition cycles.
An ELERON exclusive: flash 5× and the DRL follows your low beams from then on — Yellow when the beams are off, White when they come on. It's the same day/night behavior logic as the OEM CSL cars, and it means you never touch the toggle again.
Yes, if you're comfortable removing a wheel and wheel-arch liner. Basic hand tools, 1.5–2 hours for both sides, no lift required. A shop will quote 1–2 hours of labor.
It replaces it. 63117428425 is BMW's own module set for these headlights — a fixed white unit. The ELERON set mounts on the same points with the same screws and adds the switchable White/Yellow function the OEM part doesn't have.
Technical Specifications
| Product | Switchable White/Yellow DRL module set (both headlights) |
|---|---|
| DRL Colors | White (~6,000K) · Yellow (~3,000K) — switchable |
| Modes | Static White · Static Yellow · Auto (follows low beams) · Strobe · Ambient Breathing · Reset |
| Switching | High-beam stalk, low beams off — 3× toggle · 5× Auto · 7× Strobe · 11× Breathing · 9× Reset · selection remembered |
| In the Box | DRL modules for left & right headlight · inline control box · double-sided mounting tape |
| Mounting | Factory mounting points, original screws — direct replacement for OEM set 63117428425 |
| Wiring | Inline box on factory connectors — no cutting, no splicing |
| Coding | None · no dashboard errors · welcome light preserved |
| Factory Functions | Adaptive swiveling (552), high-beam assistant, welcome light — all untouched |
| Compatibility | BMW 1 Series F20 & F21 LCI · 2015–2019 · Adaptive LED (552) & LED (5A2) headlights |
| Not Compatible | Halogen headlights · pre-LCI (2011–2015) |
| Install Time | ~1.5–2 hours, basic hand tools (T20/T25 Torx, 8/10 mm, trim tool) |
| Operating Voltage | 12V DC |
| Warranty | 2 Years |
OEM Cross-Reference Numbers
| F20 / F21 LCI Set, LED modules · 552 & 5A2 headlights · 2015–2019 |
63117428425 (63 11 7 428 425) |
|---|
BMW lists one module set covering both the Adaptive LED (552) and LED (5A2) headlights on the F20/F21 LCI. If you're unsure what your car has, send us your VIN and we'll confirm.