GM 12-Pin Headlight Wire Harness Connector – OEM 15326915 / 15326910 Direct Fit
Direct OEM-specification replacement for the GM 12-pin headlight wire harness connector. Cross-references General Motors part numbers 15326915 and 15326910. Used in headlight assemblies across Chevrolet, GMC, Buick, and Cadillac platforms where multiple lighting circuits — low beam, high beam, DRL, turn signal, position light, and AFS — are consolidated into a single 12-pin connector.
GM 12-pin headlight connectors are a known failure point on high-mileage vehicles. The large pin count means multiple circuits share one housing, and a single corroded or damaged pin can cause an isolated lighting fault that is difficult to diagnose without knowing the pin layout. Common failure modes include: locking tab fracture from repeated bulb replacement access, terminal corrosion from moisture ingress through the headlight housing seal, and wire chafing at the connector strain relief. Replacing the connector assembly is the correct repair before condemning the headlight module or ballast.
| OEM Number | Application |
|---|---|
| 15326915 | Primary 12-pin headlight harness connector |
| 15326910 | Alternate / superseded part number |
| Pin Group | Typical Function | Failure Symptom if Open/Corroded |
|---|---|---|
| Pins 1–2 | Low beam power and ground | Low beam not illuminating |
| Pins 3–4 | High beam power and ground | High beam not illuminating |
| Pins 5–6 | DRL power and ground | DRL fault, B2590 or B2591 DTC |
| Pins 7–8 | Turn signal power and ground | Turn signal not flashing, hyper-flash |
| Pins 9–10 | Position / parking light | Position light out |
| Pins 11–12 | AFS motor control or ambient light sensor | AFS fault, headlight not levelling |
| Attribute | Detail |
|---|---|
| Pin Count | 12-Pin |
| OEM Part Numbers | 15326915 / 15326910 |
| Housing Material | Nylon PA66 |
| Application | Headlight assembly harness, multi-circuit lighting connector |
| Compatible Brands | Chevrolet, GMC, Buick, Cadillac (GM platform) |
| Terminal Included | Yes |
Q: My Chevrolet DRL warning light is on but the headlights work — is it the connector?
A: Yes. A DRL fault with functioning low/high beams is a classic symptom of corrosion on the DRL circuit pins (5–6) in the 12-pin headlight connector. GM BCM logs this as B2590 (DRL relay circuit open) or B2591 (DRL relay circuit short). Inspect and clean the connector before replacing the DRL relay or BCM.
Q: What GM fault codes does a failed headlight connector cause?
A: Common DTCs include B0080 (headlamp circuit fault), B2590/B2591 (DRL circuit), B1325 (turn signal circuit), and B2477 (module configuration failure). The specific code depends on which pin circuit has failed.
Q: Can I replace just the connector without replacing the entire headlight harness?
A: Yes. This connector is designed for splice-in repair. Cut the damaged connector from the existing harness, strip the wires, and crimp or solder the new connector terminals onto the existing wires. No harness replacement required.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
Q: Is this connector compatible with HID / xenon headlight assemblies?
A: The 12-pin connector housing is compatible with both halogen and HID headlight assemblies that use the GM 15326915 / 15326910 connector. The HID ballast connector is a separate component — verify your headlight assembly type before ordering.
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12 Pin Connectors
