BMW/MINI 63117271901 LED WITH HEAT SINK
Product Specifications
| BMW/MINI | 63117271901 |
| BMW/MINI | 63117271902 |
The LED WITH HEAT SINK is a headlamp LED light source module — an integrated assembly combining one or more high-power LED emitter chips mounted on a metal-core printed circuit board (MCPCB), bonded to an aluminium die-cast heat sink that dissipates the thermal energy generated by the LED junction during operation, forming the complete replaceable light source unit for a projector or reflector-type LED headlamp. Unlike conventional halogen or HID headlamps where the bulb is a discrete standardised component, LED headlamp light source modules are lamp-specific assemblies whose LED chip arrangement, heat sink geometry, and electrical connector pinout are unique to the headlamp design — the module's LED chip positions relative to the projector lens focal point determine the headlamp's beam pattern, cut-off line geometry, and centre-beam intensity, making dimensional and optical precision as important as electrical specification. The LED chips are driven by a constant-current LED driver module — either integrated into the headlamp housing or mounted remotely — at typically 350–1,500 mA depending on the emitter design; the driver regulates this current precisely regardless of supply voltage variation to maintain constant luminous flux and prevent LED overdriving that would cause premature junction degradation. The heat sink's thermal resistance — expressed in °C/W — determines the LED junction temperature during operation; the junction temperature is the primary determinant of LED service life and light output stability, and must be kept below the manufacturer's maximum rating — typically 125–150°C — by the heat sink's combination of conduction, natural convection from its fin array, and forced convection from the headlamp housing's internal fan or ventilation passages.
This unit — BMW/MINI 63117271901 — is manufactured to OEM-equivalent specifications: LED chip type, forward voltage and forward current specification, colour temperature (typically 5,500–6,500 K), luminous flux output, MCPCB layout and chip positioning relative to the mounting datum, heat sink outer dimensions and fin geometry, electrical connector type and pinout, and mounting hole pattern for the headlamp housing bracket are matched to the original part. Supplied as a complete LED module assembly with heat sink, ready for installation. Available wholesale from 12.04 USD, MOQ 1 pcs, production lead time 20-40 days.
LED headlamp modules fail through LED junction lumen depreciation — the gradual reduction in light output as the LED phosphor degrades from sustained operation at elevated junction temperature, visible as a noticeably dimmer beam compared to the opposite headlamp before total failure; through thermal interface degradation between the MCPCB and the heat sink from vibration-induced fretting that increases thermal resistance and accelerates junction temperature rise; and through LED driver circuit failure — either in the remote driver module or in driver components integrated on the MCPCB — that causes flickering, partial illumination, or complete loss of the affected function. On modern multi-function LED headlamps separate LED modules serve the low beam, high beam, daytime running light, and turn signal functions, and each module can fail independently.
- Read all headlamp and body control module fault codes before disassembling the headlamp — LED headlamp fault codes distinguish between LED open circuit (module failure), LED driver fault (driver circuit failure), temperature sensor fault, and communication fault; replacing the LED module when the actual fault is in the remote driver module or the communication wiring wastes the module cost and requires a second disassembly; confirm the fault code specifically identifies the LED module before proceeding to disassembly.
- Handle the new LED module only by the heat sink body — never touch the LED chip surface or the MCPCB soldering areas — skin oils from fingerprints on the LED chip surface absorb the LED's emitted light at the chip interface and create a localised hot spot that accelerates lumen depreciation at the contaminated zone; fingerprints on solder joints introduce corrosive salts that initiate joint degradation; wear clean nitrile gloves throughout the module handling and installation procedure.
- Apply fresh thermal interface material between the new module's heat sink and the headlamp housing heat sink contact surface if the original thermal pad has been disturbed — the thermal interface material fills the microscopic air gaps between the module's heat sink base and the headlamp housing's heat spreader, reducing the contact thermal resistance; a dry metal-to-metal contact without thermal interface material increases the module's thermal resistance and elevates the junction temperature above the designed operating point; use a 1mm-thick graphite or silicone thermal pad of the correct dimensions, or thermal paste of the OEM-specified type — never substitute with general-purpose silicone grease.
- Confirm the module is correctly indexed to the housing's locating features before tightening any fasteners — LED modules for projector headlamps have precision locating pins, slots, or tab features that position the LED chip array at the exact designed distance and angle from the projector lens focal point; a module installed with the locating features partially engaged will produce an incorrect beam cut-off line and centre beam position even though the module illuminates correctly; confirm all locating features are fully engaged before applying any tightening force.
- Inspect and clear the headlamp housing vent passages and drainage ports after module replacement — a module that failed from overtemperature may have failed because the housing's ventilation was blocked; clear all vent passages with dry compressed air and confirm the drainage port is open before refitting the rear cover; if the headlamp has a cooling fan, test fan operation by activating the headlamp and listening for fan rotation — a failed fan requires replacement to prevent immediate re-failure of the new module.
- Install the new LED WITH HEAT SINK (BMW/MINI 63117271901), refit the headlamp rear cover with a new seal where disturbed, reconnect the electrical connector, activate all headlamp functions and confirm correct illumination of all modules including DRL, low beam, high beam, and turn signal, verify headlamp beam aim on a calibrated screen and adjust if necessary, clear all headlamp fault codes, and confirm no fault codes return after a 10-minute drive cycle before returning the vehicle to service.
| Part | Reason for Combined Replacement |
|---|---|
| LED Driver Module Ballast / control unit — OEM ref. varies by headlamp | The LED driver module regulates the constant current delivered to the LED chips and is the component most frequently responsible for flickering, intermittent operation, and fault codes that appear to indicate LED module failure. A driver module that has been operating with a failing LED — whose increasing forward voltage from junction degradation causes the driver to operate continuously at or beyond its output compliance limit — accumulates thermal stress that accelerates its own capacitor and MOSFET degradation. If the LED module failed from electrical overdriving rather than thermal stress, inspect the driver's output current with a clamp meter before fitting the new module — a driver delivering above the rated LED current requires replacement simultaneously with the module. |
| Headlamp Assembly Complete unit — where module access is impractical | On headlamp designs where the LED module is bonded or thermally pasted to the housing heat spreader without a serviceable access point, or where the module-to-housing interface requires specialist factory tooling to separate without damaging the housing, replacement of the complete headlamp assembly is more practical and cost-effective than module-only replacement. Confirm module replaceability from the OEM service documentation before ordering a module — some headlamp designs are explicitly designated as non-serviceable assemblies where the complete headlamp is the correct replacement unit. |
| Headlamp Rear Cover Seal Rubber gasket — application-specific | The headlamp rear cover is removed to access the LED module and its rubber seal is disturbed during removal; a seal that has been compressed at operating temperature for the headlamp's service life takes a permanent compression set and may not reseal reliably when the cover is refitted. A failed rear cover seal allows moisture to enter the headlamp housing, depositing condensation on the lens interior and on the new LED module's MCPCB — reproducing the condensation damage that may have caused the original module failure. Always replace the rear cover seal simultaneously with the LED module. |