Toyota 4-Pin Hazard & Turn Signal Flasher Connector – Male & Female OEM
This 4-pin connector serves Toyota hazard warning flasher and turn signal relay harnesses. The 4-pin configuration integrates the flasher relay power supply, ground, turn signal output, and hazard switch input circuits — a single relay unit controlling both functions simultaneously. Available in Male, Female, bare, 15cm pre-wired, and 20cm Male+Female pair variants.
| Pin | Label | Function | Failure Symptom if Corroded |
|---|---|---|---|
| 1 | B+ | Battery positive — permanent 12V supply | All indicators dead (no power to relay) |
| 2 | E | Ground / chassis earth | All indicators dead (no ground return) |
| 3 | L | Turn signal output — feeds left and right indicator circuits | Hyper-flash or intermittent indicators |
| 4 | HZ | Hazard switch input — activates all four indicators | Hazard works but turn signals don’t (or vice versa) |
| Attribute | Detail |
|---|---|
| Pin Count | 4-Pin |
| Gender Options | Male / Female / Male+Female pair |
| Housing Material | Nylon (PA66) |
| Wire Option | Bare / 15cm pre-wired / 20cm Male+Female pair |
| Application | Hazard warning flasher relay, turn signal relay harness |
| Compatible Brands | Toyota, Lexus |
| Model | Relay Location |
|---|---|
| Camry XV50/XV70 | Behind instrument cluster, left of steering column |
| Corolla E170/E210 | Fuse box under dashboard, driver’s side |
| RAV4 XA40/XA50 | Junction block under dashboard |
| Hilux AN10/AN20/AN120 | Relay block in engine bay, driver’s side |
| Land Cruiser 200 | Relay block under dashboard, driver’s side |
When upgrading from incandescent to LED turn signal bulbs, the flasher relay detects the lower current draw of LEDs as a “bulb out” condition and increases flash rate (hyper-flash). The correct fix is to replace the flasher relay with an LED-compatible electronic flasher — not to add load resistors, which waste power and generate heat. This connector is required when replacing the flasher relay as part of an LED upgrade. The 4-pin OEM connector ensures the new LED-compatible relay integrates correctly with Toyota’s combined turn signal and hazard circuit.
Older Toyota models (pre-2000) use a 2-pin flasher relay carrying only power and output — no dedicated hazard input. The 4-pin version integrates the hazard switch circuit, allowing a single relay to control both turn signals and hazard lights. Most Toyota models from 2000 onward use the 4-pin configuration. If your vehicle has a combined turn signal and hazard relay (one unit for both functions), you need the 4-pin connector.
Q: My Toyota turn signals flash fast on one side only — is it the connector?
A: Fast flashing on one side indicates a bulb failure or high-resistance connection on that circuit. Check the bulbs first, then inspect the flasher connector for corrosion on Pin 3 (L output). A corroded Pin 3 increases circuit resistance, mimicking a bulb-out condition on one side.
Q: Hazard lights work but turn signals don’t — what’s wrong?
A: This is the classic symptom of Pin 4 (HZ) corrosion. The hazard switch input circuit is open, so the relay cannot receive the turn signal command. Replace the connector and clear any stored fault codes.
Q: Does this fit Lexus vehicles?
A: Yes. Lexus IS, ES, RX, and GX models share Toyota’s electrical architecture and use the same 4-pin flasher relay connector as their Toyota platform equivalents.
Q: What is the 20cm Male+Female pair used for?
A: The 20cm pair provides both connector sides with pre-wired leads for harness extension when relocating the flasher relay or repairing a damaged section of harness between the relay and fuse box.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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