Toyota 4-Pin Brake Relay Wire Harness Connector – OEM 90980-10940 | Male & Female

The OEM 90980-10940 is a 4-pin connector used in Toyota brake relay and brake system harnesses. This connector serves the brake light relay, brake booster solenoid, or brake-related control module circuits. Available in Male and Female variants, bare or with 15cm pre-wired leads.

Key Specifications

Why Brake Relay Connectors Fail

Brake relay connectors on Toyota vehicles are exposed to heat from the relay, vibration, and moisture in the engine bay or brake booster area. Terminal corrosion or housing damage causes brake light relay failures, brake booster solenoid faults, or brake system warning lights. Symptoms include brake warning light, ABS activation issues, or brake booster vacuum faults. Replacing the connector restores clean brake circuit continuity.

Variant Guide

• Male / Male 15CM – Plug-side connector for relay or module side
• Female / Female 15CM – Socket-side connector for harness side

Installation Steps

1. Disconnect the vehicle battery
2. Locate the 4-pin brake relay connector in the engine bay or brake booster harness
3. Release the locking tab and unplug the original connector
4. Transfer terminals to the new housing or splice in the pre-wired variant
5. Reconnect and verify brake light and brake booster function
6. Clear fault codes with Toyota Techstream if required

Frequently Asked Questions

Q: What Toyota models use OEM 90980-10940?
A: This connector is used on Toyota Camry, Corolla, RAV4, Hilux, and Land Cruiser brake relay and brake system harnesses. Cross-reference your vehicle’s wiring diagram to confirm fitment.

Q: What fault codes indicate a failed brake relay connector?
A: Common symptoms include brake warning light, ABS fault codes (C-codes), brake booster vacuum sensor faults, and brake light circuit errors on Toyota Techstream.

Q: Are terminals included?
A: Yes, terminals are included with all variants.

Compatible Applications

• Toyota Camry / Corolla – Brake relay harness
• Toyota RAV4 / Hilux – Brake booster solenoid connector
• Toyota Land Cruiser – Brake system harness
• Toyota 90980-10940 brake circuit applications