BMW/MINI 63117311243 CONTROL UNIT HEADLIGHT
Product Specifications
Product quality
OEM Equivalent Grade
On request
bolt MOQ (Minimal order)
1 pcs
local_shipping Production time
20-60 days
package_2 Shipping Weight:
—
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Application (cross references) 2
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| BMW/MINI | 63117311243 |
| BMW/MINI | 63117398766 |
Overview & Operating Principle
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The CONTROL UNIT HEADLIGHT is the high-intensity discharge (HID) xenon headlamp ballast and igniter control unit that generates the electrical conditions necessary to initiate and sustain the arc discharge in a xenon burner — the light source in HID headlamp systems. The ballast performs three sequential functions during every lamp start cycle: the igniter stage generates a high-voltage pulse of 20,000–30,000 volts across the burner electrodes to ionise the xenon gas fill and initiate the arc discharge; the warm-up stage supplies a controlled high-wattage power — typically 35–70W — to rapidly bring the arc plasma to its operating temperature and luminous output within 3–4 seconds; and the steady-state regulation stage precisely maintains 35W input power to the established arc regardless of vehicle supply voltage fluctuation, ensuring constant luminous output and colour temperature throughout operation. The ballast converts the vehicle's 12V DC supply into the high-frequency AC output — typically 400–500 Hz — required by the xenon burner, using a DC-to-DC converter followed by a full-bridge inverter; an internal microcontroller continuously monitors burner voltage and current, detecting arc extinguishment and automatically re-igniting, and shutting down the output if a fault condition — open circuit, short circuit, or sustained overvoltage — is detected to protect both the ballast and the optical components.
This unit — BMW/MINI 63117311243 — is manufactured to OEM-equivalent specifications: rated output power and frequency, ignition pulse voltage and duration, warm-up power profile, steady-state regulation accuracy, input voltage range, connector pinout for both the vehicle supply connector and the burner high-voltage connector, and housing dimensions and mounting bracket geometry for the specific headlamp application are matched to the original part. Supplied as a direct replacement for standard fitment. Available wholesale from 0.18 USD, MOQ 1 pcs, production lead time 20-60 days.
HID ballasts fail through MOSFET and capacitor failure in the inverter stage from voltage spikes caused by poor vehicle electrical system health — weak batteries, corroded supply connectors, and undersized ground paths subject the ballast's input stage to damaging transients on every start cycle; through igniter circuit failure from the cumulative stress of repeated re-ignition attempts on a degraded burner; and through moisture ingress into the ballast housing through a cracked or unsealed mounting gasket. Before replacing the ballast, always verify the xenon burner is serviceable — a burner that has reached end of life forces repeated re-ignition attempts that destroy the ballast's igniter circuit even after a new ballast is fitted.
Symptoms & Diagnostics
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One headlamp does not illuminate at all — no flash, no flicker, complete dark — the ballast has failed open-circuit or the internal microcontroller has detected a sustained fault and latched the output off; swap the ballast from the working side to the non-working side to confirm — if the lamp lights with the known-good ballast, the original ballast has failed; if the lamp remains dark with the known-good ballast, the burner has failed.
Headlamp that flickers or extinguishes and relights during operation — particularly after the lamp has been on for 5–10 minutes — thermal shutdown of the ballast from inadequate cooling caused by a partially blocked mounting position, or intermittent output from a failing capacitor in the inverter stage; a lamp that flickers only when warm but is stable when cold is the characteristic presentation of capacitor ESR degradation.
Headlamp that takes longer than 3–4 seconds to reach full brightness on each cold start — the ballast's warm-up power stage output has reduced from component ageing; the arc ignites correctly but the warm-up power is insufficient to bring the burner plasma to operating temperature within the designed time; the lamp eventually reaches full output but the delayed warm-up is noticeable as a safety deficiency in darkness.
Headlamp warning light on the instrument cluster or BCM fault code indicating xenon lamp circuit fault — the BCM monitors the headlamp circuit current and detects abnormal current patterns from a failed ballast or burner; confirm which side has the fault from the fault code description before swapping components; both sides showing fault codes simultaneously suggests a supply voltage or ground fault common to both ballasts rather than individual ballast failure.
Headlamp that produces a pink, green, or blue-shifted colour temperature rather than the characteristic 4,200–6,000K white-blue output — the burner has reached end of life and its xenon fill has degraded; a new burner fitted with an aged ballast may restore correct colour temperature initially but the ballast's weakened igniter circuit will cause early failure of the new burner; always replace both ballast and burner simultaneously when colour shift is confirmed.
Burned smell from the headlamp area or visible scorch marks on the ballast housing — an internal component failure has caused localised overheating within the ballast; a ballast with physical heat damage must be replaced as the internal circuit damage is beyond repair and the risk of further failure including fire is elevated.
Logistics & Customs
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International HS Code
8537.10
EAEU Customs Code (TN VED)
8537 10 910 0
Typical Net Weight
Country of Manufacture
China
Standard MOQ
1 pcs
Production Lead Time
20-60 days
Always verify the exact 8-digit or 10-digit subheading with your customs broker for the destination country, as tariff schedules and duty rates vary by jurisdiction.
Installation Tips
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- Disconnect the negative battery terminal and wait a minimum of 3 minutes before handling any HID ballast or high-voltage connector — the ballast's internal capacitors retain a lethal charge of up to 30,000 volts for several minutes after the ignition is switched off; the high-voltage connector to the burner carries this residual charge; never touch the high-voltage lead terminals or the burner electrodes without confirming the ballast has fully discharged; always treat the HV circuit as live until confirmed discharged.
- Isolate the high-voltage burner connector before removing the ballast from its mounting — disconnect the HV connector from the burner end first by pressing the locking collar and pulling straight back; then disconnect the low-voltage supply connector from the ballast body; this sequence ensures the HV circuit is open at the burner before any other manipulation of the ballast or harness.
- Inspect the vehicle supply voltage and the ballast ground circuit quality before fitting the new ballast — measure battery voltage under load (engine cranking) and confirm it is above 11.5V; measure voltage drop between the ballast ground pin and the battery negative terminal with the ballast operating — more than 0.2V drop indicates a high-resistance ground path that will cause repeated transient damage to the new ballast's input stage; clean and tighten ground connections before installation.
- Verify the xenon burner condition before fitting the new ballast — install the new ballast with the existing burner and observe the lamp start sequence; if the lamp ignites correctly and reaches full brightness within 4 seconds with stable colour temperature, the burner is serviceable; if the lamp flickers, takes more than 8 seconds to light, or produces abnormal colour, the burner has degraded and must be replaced simultaneously to prevent the new ballast's igniter circuit from being destroyed by repeated re-ignition attempts on the failing burner.
- Ensure the ballast mounting position provides adequate airflow for cooling — HID ballasts are rated for a specific maximum ambient temperature and must be mounted in a position where convection cooling can maintain the housing temperature below the rated limit; a ballast mounted against a hot surface or in a stagnant air pocket will overheat under sustained operation, causing the thermal shutdown protection to cycle the lamp and shortening the ballast's service life through repeated thermal stress.
- Install the new CONTROL UNIT HEADLIGHT (BMW/MINI 63117311243), reconnect both the low-voltage supply and the high-voltage burner connectors, reconnect the battery, switch on the headlamps, and observe both the start sequence — clean single ignition within 1 second, full brightness within 4 seconds — and the sustained output colour temperature; clear any BCM fault codes and confirm both headlamps produce matched output before returning the vehicle to service.
Tools: insulated gloves for HV connector handling, multimeter for supply voltage and ground resistance verification, OBD-II scanner with BCM lighting diagnostic access, minimum 3-minute discharge wait timer after battery disconnection.
Frequently Asked Questions
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Should the xenon burner always be replaced simultaneously with the ballast?
Replacing both ballast and burner simultaneously is strongly recommended when the failed side shows any sign of burner degradation — extended start time, colour shift, flickering, or a burner that has accumulated more than 1,000 operating hours. A degraded burner requires repeated re-ignition attempts that impose high-voltage stress on the new ballast's igniter transformer and capacitors, shortening the new ballast's service life to a fraction of its rating. When replacing only the ballast after a confirmed electrical fault on a burner of less than 500 hours, the burner may be retained, but plan to replace it at the next service. ok.parts supplies HID ballasts and xenon burners individually and as matched pairs at wholesale MOQ from 0.18 USD per unit.
Can an aftermarket HID ballast of higher wattage — 55W or 70W — be substituted for the OEM 35W ballast for increased output?
Fitting a higher-wattage ballast than the OEM specification is not recommended and causes multiple problems. The headlamp lens and reflector are designed for 35W operation — a 55W ballast subjects the lens and reflector coating to higher operating temperatures that accelerate UV degradation and reflector hazing, reducing output below the 35W design level within a short period despite the higher input power. The higher wattage also increases the beam's raw intensity beyond the ECE approval parameters of the headlamp assembly, dazzling oncoming traffic and potentially constituting a roadworthiness violation. The headlamp's automatic levelling system is calibrated for the 35W photometric output — a higher-wattage lamp may produce glare even at the mechanically correct beam aim. Always replace with the OEM-specified wattage.
How does the OEM-equivalent aftermarket unit compare to the genuine OEM part?
OEM-equivalent units in this catalogue replicate the current OEM design geometry and material specification. Quality is verified against OEM cross-reference data. When ordering in bulk, confirm with our team that the specification matches the latest OEM revision for your application.
Is white-label or custom packaging available for wholesale orders?
Yes. ok.parts works directly with the manufacturing facility and can accommodate neutral white-label packaging or fully branded packaging with your company logo, part numbers, and barcode. Minimum order quantities and lead times for custom packaging may differ from standard stock. Contact the team via the inquiry form to discuss your specific requirements.
Frequently Replaced Together
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| Part | Reason for Combined Replacement |
|---|---|
| Xenon HID Burner D1S, D2S, D3S, D4S — application-specific | The xenon burner and ballast form a matched operating pair — a burner approaching end of life demands repeated re-ignition attempts that destroy the ballast's igniter transformer, and a ballast with a weakened igniter circuit cannot reliably start a serviceable burner within the designed 1-second window. Replacing both simultaneously ensures the complete HID system is renewed with matched new components and maximises the service life of both units. Always confirm the correct D-type designation before ordering — D1S, D2S, D3S, and D4S burners use different mercury contents and voltage requirements and are not interchangeable. |
| High-Voltage Connector and Harness Application-specific HV lead | The high-voltage cable between the ballast output and the burner carries 20,000–30,000V during each ignition pulse. The cable insulation degrades from repeated high-voltage stress and from underbonnet heat and UV exposure — a hairline crack in the insulation causes arc-over to the headlamp housing metalwork, producing a fault that presents identically to ballast failure. Inspect the HV lead insulation carefully when replacing the ballast and replace the lead if any surface cracking, stiffness, or discolouration is found. |
| Headlamp Levelling Motor OEM ref. varies by headlamp assembly | HID headlamp systems require mandatory automatic beam levelling under ECE R48 regulations — the levelling motor is integral to the headlamp assembly and must be functional for the system to comply with type approval. If the headlamp assembly is being accessed to replace the ballast, inspect the levelling motor for noise and confirm it responds to the scan tool levelling command; a levelling motor that has failed simultaneously with the ballast from a shared moisture ingress event should be replaced at the same time to restore full regulatory compliance. |