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GL301-14021 / GL291-14021 Automotive 14-Pin Waterproof Headlight Connector — Hyundai / KIA LED Lamp Wiring Socket
GL301-14021 / GL291-14021 Automotive 14-Pin Waterproof Headlight Connector Hyundai / KIA LED Lamp Wiring Socket
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GL301-14021 / GL291-14021 Automotive 14-Pin Waterproof Headlight Connector — Hyundai / KIA
The GL301-14021 (female socket) and GL291-14021 (male plug) are 14-pin waterproof automotive headlight connectors for Hyundai and KIA LED headlamp assembly wiring harnesses. These KET (Korea Electric Terminal) series connectors are the standard sealed interface between the vehicle wiring harness and the headlamp assembly’s integrated LED drivers, adaptive leveling motors, and sensor circuits on modern Hyundai/KIA platforms. The 14-pin configuration accommodates the full circuit complement of a modern multi-function LED headlamp: low beam, high beam, DRL, turn signal, position light, leveling motor, LIN bus communication, and temperature monitoring.
Headlamp connector failure on Hyundai/KIA vehicles is a well-documented issue — moisture ingress through degraded wire seals causes terminal corrosion that triggers headlamp warning lights, partial headlamp failure, and B-code body control DTCs. Replacing the connector is the correct first repair step before condemning the headlamp assembly or LED driver module.
Key Specifications
| Parameter | Value |
|---|---|
| OEM Part Numbers | GL301-14021 (female) / GL291-14021 (male) |
| Series | KET (Korea Electric Terminal) |
| Pin Count | 14-pin |
| Sealing | Waterproof (sealed housing + wire seals) |
| Housing Material | PA66 glass-filled nylon |
| Terminal Material | Tin-plated copper alloy |
| Operating Temperature | -40°C to +125°C |
| Compatible Platforms | Hyundai, KIA (KET harness) |
| Compliance | RoHS |
Compatible Vehicles
| Brand | Model | Notes |
|---|---|---|
| Hyundai | Sonata (LF/DN8), Tucson (TL/NX4), Santa Fe (TM), Elantra (CN7) | LED headlamp variants |
| KIA | Sportage (QL/NQ5), Sorento (UM/MQ4), K5 (DL3), Stinger (CK) | LED headlamp variants |
| Genesis | G70, G80, GV80 | LED/adaptive headlamp |
Why Headlamp Connectors Fail on Hyundai / KIA
- Wire seal degradation — the rubber wire seals in the GL301/GL291 connector harden and crack after 5–8 years of thermal cycling; moisture then wicks along the wire into the connector and corrodes the terminals
- LED driver heat cycling — LED headlamp drivers generate significant heat; the connector sits adjacent to the driver module and experiences repeated thermal expansion/contraction that fatigues the terminal contact springs
- Road spray and car wash exposure — the front headlamp location is directly exposed to road spray, pressure washing, and rain; even a small seal failure allows water ingress
- Corrosion causes LED driver faults — a corroded terminal increases resistance in the LED driver power or communication circuit, causing the driver to fault and shut down — often misdiagnosed as a failed LED driver module
Fault Codes Associated with This Connector
| DTC | Description | Likely Cause |
|---|---|---|
| B1600–B1699 | Headlamp control module circuit faults | Power/ground terminal corrosion |
| B2200–B2299 | Exterior lighting circuit faults | LED driver signal circuit fault |
| U0100–U0199 | Lost communication with headlamp module | LIN bus terminal corrosion |
Frequently Asked Questions
Q: How do I confirm the connector is the fault before replacing the headlamp assembly?
Disconnect the GL301-14021 connector and inspect all 14 terminals for green or white corrosion. Use a multimeter to check for battery voltage at the power supply terminals (with ignition on) and continuity on the ground terminals. If voltage and ground are present but the headlamp still faults, use a scan tool to check for LIN bus communication errors — a corroded LIN bus terminal (typically 1–2 pins) will cause the headlamp module to drop off the bus and trigger U-code DTCs. Cleaning or replacing the connector resolves the fault in the majority of cases without replacing the headlamp assembly.
Q: Can I replace just the female connector (GL301-14021) without replacing the male side?
Yes — in most cases, the corrosion occurs on the harness-side (female) connector because moisture wicks along the wires from outside. The headlamp-side (male) connector is protected inside the headlamp housing and is less frequently damaged. Inspect both sides before ordering — if only the female side is corroded, replacing GL301-14021 alone is sufficient.
Q: Do I need to recalibrate the adaptive headlamps after replacing the connector?
If the headlamp leveling motor circuit was interrupted by the connector fault, the leveling motor may have lost its reference position. After replacing the connector and clearing DTCs, perform a headlamp leveling calibration using a Hyundai/KIA-compatible scan tool (GDS Mobile, KDS, or equivalent). This resets the leveling motor to its reference position and ensures correct headlamp beam alignment. Failure to calibrate may result in headlamp beam misalignment and a recurring leveling fault code.
