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The automotive lighting system is mainly composed of four major parts: external lighting lamps, internal lighting lamps, external signal lamps and internal signal lamps. External lighting lamps include headlights, fog lamps, etc., which are primarily used for nighttime road illumination and visibility enhancement in adverse weather conditions. Headlights typically employ LED or halogen light sources with brightness exceeding 1000 lumens. Internal lighting lamps encompass dome lights, instrument panel lights, step lights, etc., with power ratings ranging from 2 to 20 watts, utilizing white light to provide uniform cabin illumination. Among these, dome lights are predominantly installed at the roof center, while instrument panel lights are integrated within the dashboard to ensure clear readability of driving information. Signal lamps are categorized into external and internal types. External signal lamps such as turn indicators and brake lights utilize high-intensity red or amber LEDs, with luminous intensity conforming to UNECE regulatory standards. Internal signal lamps include warning functions like seat belt reminder lights. Modern lighting systems commonly incorporate intelligent control technologies, such as automatic headlights activated via photosensors, while some premium models feature Adaptive Driving Beam (ADB) systems capable of dynamically adjusting illumination ranges to prevent glare. The lighting system's wiring harness typically employs heat-resistant materials, with fuse ratings designed according to lamp power consumption, commonly ranging from 5A to 15A. Routine maintenance should focus on inspecting bulb contact oxidation and lens light transmittance. During replacement, particular attention must be paid to the lamp's IP protection rating, especially for fog lamps which require a minimum waterproof rating of IP6K7.

The repairability of LED car lights depends on the specific type of fault and the extent of damage. Common issues such as damaged LED chips, faulty power adapters, or poor circuit connections can be diagnosed and repaired using professional tools. For repairs, tools like a Phillips screwdriver, multimeter, and soldering iron are required. Priority should be given to checking the stability of power connections and verifying the driver's output voltage (replace with an identical model if abnormal). If LED chips show signs of burnout or discoloration, they must be replaced with matching specifications (ensuring consistency in package dimensions and voltage ratings). For highly integrated light modules or damaged PCBs, professional technicians should be engaged to maintain safety and waterproof integrity. Notably, inadequate heat dissipation in LED car lights may accelerate lumen depreciation, and regular dust removal from fixtures can prolong service life. Persistent issues like flickering or uneven illumination after DIY repairs may indicate driver circuit instability, warranting further diagnostics. While repair costs are typically lower than complete assembly replacement, labor and component expenses should be evaluated (e.g., individual LED chips cost RM5-15, while drivers range RM30-80).

The maintenance of a car's lighting system should cover multiple aspects such as cleaning, inspection, adjustment, and moisture protection to ensure its normal operation and extend its service life. Daily maintenance involves regularly cleaning the surface of the lamp housing with a soft cloth, avoiding corrosive cleaners. Stubborn stains can be treated with a special cleaner. At the same time, ensure the bulb has cooled before operation and avoid direct hand contact. When inspecting bulbs, monitor brightness changes. Halogen bulbs typically last 500-1000 hours, LED bulbs 20,000-50,000 hours, and xenon bulbs 2,500-3,000 hours. Replace with identical specifications when brightness diminishes. For beam angle adjustment, observe the light pattern projected on a wall 5 meters away on level ground, then correct deviations using adjustment screws. For electrical components, check fuse integrity and wire condition while ensuring proper housing seals. If condensation forms inside, activate the lights to evaporate moisture; severe cases may require disassembly for drying. Additionally, minimize frequent light switching (particularly halogen and xenon bulbs) and deactivate lights before engine shutdown to reduce electrical surges. Recommended maintenance intervals: monthly housing cleaning, quarterly bulb inspections, semi-annual beam adjustments, and prompt replacement of defective components as needed. Bulb characteristics vary: halogen offers low cost but high energy use; xenon delivers high brightness requiring ballasts; LEDs provide energy efficiency and longevity with higher initial investment. Systematic maintenance ensures nighttime driving safety and optimal illumination performance.

The inspection of a vehicle's external lighting system should cover three aspects: appearance, function, and circuitry. First, all lamp covers must be checked for integrity, ensuring no cracks, stains, or yellowing due to oxidation, to maintain good light transmittance. Functional testing should be conducted in low-light conditions: low-beam headlights should illuminate a distance of 10 meters with a horizontal cut-off line, and their height should be adjusted to 0.6–0.8 times the headlight height to avoid glare; high-beam headlights must be verified for illumination range and brightness; turn signals should flash consistently at 60–120 times per minute; brake lights must activate within 0.2 seconds of pedal depression and be at least 5 times brighter than tail lights. For automatic lighting systems, test whether the photosensor switches modes based on ambient light levels. Circuit checks should include verifying fuse integrity and inspecting plugs for oxidation or looseness; for LED lamps, ensure the flicker rate remains below 300Hz. Particular attention should be paid to side marker visibility, which must be clearly discernible from 30 meters, and fog lights must emit amber or yellow light capable of penetrating rain and fog. Regular professional photometric testing (≥40 cd daytime, ≥80 cd nighttime) ensures compliance with JPJ safety standards. Additionally, clean lamp interiors every 6 months to prevent condensation from impairing optical performance.

The four core components of an automobile lighting system include external lighting fixtures, internal lighting fixtures, external signal lamps, and internal signal lamps. External lighting fixtures cover headlights, fog lights, etc., which are mainly used for road lighting at night. Among them, headlights need to uniformly illuminate the road surface for more than 100 meters and avoid glare, with a power usually ranging from 25 to 60W. Internal lighting fixtures such as dome lights and instrument lights provide cabin lighting, with a power mostly between 2 and 20W and white light color. Signal lamps are divided into external and internal categories. External ones like turn signals and brake lights are used for vehicle status warning, while internal ones such as instrument indicator lights display the status of vehicle systems. Modern lighting systems generally adopt LED technology to improve energy efficiency and service life. These components work together to ensure driving safety and operational convenience. When purchasing, attention should be paid to the compliance and adaptability of the lamps.