Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit Opening Relay (4Runner)
Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied through IGN fuse to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION . Circuit opening relay may also be identified by appropriate illustration in appropriate SYSTEM & COMPONENT TESTING article.
| Application | Location | ||
|---|---|---|---|
| Avalon | Top Corner Of Relay Box Behind Driver's Side Kick Panel | ||
| Camry & Camry Solara | In Fuse/Relay Box At Driver's Side Front Corner Of Engine Compartment | ||
| Celica | In Fuse/Relay Box At Driver's Side Front Corner Of Engine Compartment, Just In Front Of Strut Tower | ||
| Corolla & Matrix | Center Relay In Relay Box Behind Driver's Side lower instrument Panel | ||
| ECHO | In Fuse/Relay Box Behind Driver's Side Of Instrument Panel | ||
| Highlander | In Relay Box Just Above Driver's Side Kick Panel | ||
| MR2 | In Relay Box On Firewall At Driver's Side Front Corner Of Engine Compartment | ||
| Prius & RAV4 | In Fuse/Relay Box At Driver's Side Front Corner Of Engine Compartment | ||
| Land Cruiser, Sequoia, Sienna, Tundra, & 4Runner | In Fuse/Relay Box At Driver's Side Front Corner Of Engine Compartment | ||
| Tacoma | Behind Lower Instrument Panel Cover, Next To Left Side Of Steering Column | ||
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NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.