Where is the circuit opening relay on a 2007 Toyota Camry?

On a 2007 Camry, the circuit opening relay (COR) is typically located in the engine compartment’s main fuse/relay box, usually labeled COR or MAIN. If you don’t see it there, check the interior fuse box behind the driver’s knee panel, as some trims place the COR there. This relay is the main power relay that supplies the ECU and related circuits during starting.

Understanding exactly where to look helps you diagnose no-start or stalling issues more quickly. The location can vary by engine, trim level, and manufacturing date, so it’s helpful to verify with the vehicle’s fuse/relay diagram on the lid or in the owner's manual. The following guide outlines common locations and how to identify the COR on a 2007 Camry.

Engine-compartment location

The most common spot for the COR on a 2007 Camry is inside the engine bay fuse/relay box. Here’s how to proceed:

• Open the hood and locate the engine compartment fuse/relay box. It’s typically on the driver's side near the battery or along the shock tower/fender area.


• Remove the lid and inspect the diagram printed on the underside for a relay labeled “COR,” “Main,” or “ECU.”


• Physically locate the relay that matches the diagram and label. It is usually a single, medium-sized relay among other relays.


• If unsure, compare the relay’s position to the diagram on the box cover and note the adjacent relays that are nearby.

Note: In some Camry models, the label may read “Main Relay” instead of “COR.” The COR’s job is to provide power to the ECU and fuel/injection circuits when the ignition is turned on.

Interior (dashboard/knee) fuse box location

On certain trims or production runs, the COR may be located in the interior fuse box behind the driver's knee panel rather than the engine bay. Here’s how to check:

• Slide out the underside cover from the driver's side dash/knee area to access the interior fuse box.


• Look for a relay labeled “COR,” “Main Relay,” or similar in the interior box. The diagram on the inside of the fuse box cover will help you identify it.


• If you find a relay that matches the label, that’s your COR for that specific model/trim.

If you’re unsure which relay is the COR, refer to the owner’s manual or a factory service manual for your exact VIN and engine code, since labelings can vary by market and production date.

Testing and cautions

Before removing or swapping the COR, disconnect the battery to avoid short circuits. If you’re diagnosing a no-start condition:

• Ensure the ignition switch, battery, and ground connections are clean and secure.


• Use a multimeter to verify the COR has proper continuity when the ignition is on (refer to the service manual’s spec for resistance/voltage).


• If the COR is suspected faulty, replace it with an OEM or approved equivalent and re-test the systems it powers (ECU, fuel pump, etc.).

Some Camry models may use a different main relay configuration or may have multiple relays that supply power to the ECU in stages. Always confirm with the vehicle’s diagram for your exact year, engine, and trim.

What if you still can’t locate it?

If you’re having trouble pinpointing the COR, consult these resources and steps:

• Check the vehicle’s owner’s manual for the fuse/relay diagram and exact labeling for your trim and engine code.


• Look inside the fuse boxes (engine bay and interior) for a diagram that lists COR or MAIN RELAY and cross-check with the relays present.


• Refer to the Toyota Workshop Manual for your VIN to confirm the COR’s exact location and testing procedure.

In all cases, ensure you follow safety precautions when working with the electrical system, including disconnecting the battery and using proper insulated tools.

Summary

The circuit opening relay on a 2007 Toyota Camry is most commonly found in the engine compartment’s main fuse/relay box, labeled COR or MAIN. If not there, check the interior fuse box behind the driver’s knee panel, as some trims place the COR there. Always verify with the diagram on the fuse box cover or the owner’s/service manual for your exact vehicle configuration, and proceed with care when testing or replacing the relay.

Brief takeaway: locate the COR by consulting the fuse/relay diagrams in the engine bay box first, then check the interior box if needed, and replace only with an equivalent relay following proper safety procedures.

What is a C-OPN relay on a Toyota?

The current flows to the C/OPN (Circuit Opening) relay by turning the Tr1 ON. Then, the fuel pump operates. While the NE signal is input into the ECM, when the engine is running, the ECM turns the Tr1 on continuously. Fuel Pump Control Circuit.

Why is my Camry 2007 not starting?

A 2007 Toyota Camry won't start due to common issues like a dead or corroded battery, a faulty starter relay or starter motor, and ignition switch problems. Other potential causes include a failing fuel pump, a bad ignition switch, or an immobilizer system fault, especially with the smart key system. 
Initial checks

• Check the battery: A weak or dead battery is a very common cause. Check if the headlights dim or if the dashboard lights flicker when you try to start the car. 
• Inspect battery terminals: Look for corrosion or looseness at the battery terminals. Clean them with a wire brush and make sure they are tight. 
• Try a jump-start: If the battery is the issue, a jump-start can get the car running. 
• Check fuel level: Ensure you have enough gas in the tank. 
• Listen for the fuel pump: Turn the key to the "on" position (not "start") and listen for a low hum from the rear of the car, which indicates the fuel pump is running. 

Troubleshooting specific components

• Starter relay: A common culprit is the starter relay, which is often in the engine compartment fuse box. 
  • Look for a diagram on the fuse box lid to find the "ST" or "Start" relay. 
  • If you hear a clicking sound, it could be the starter relay or a poor electrical connection. 
  • You can test it by swapping it with another similar relay in the fuse box or by testing it with a multimeter. 
• Starter motor: If the relay is good, the starter motor itself may be failing. 
• Ignition switch: A faulty ignition switch can cause a no-start condition. 
• Smart key system: If your 2007 Camry has a smart key, a dead battery in the key fob can prevent it from starting. The car's immobilizer system may also be causing a fault. 
• Fuel pump: If you don't hear the fuel pump when the key is turned on, it could be faulty. 
• Alternator: An alternator problem might be preceded by dimming lights or a battery warning light before the car fails to start. 

When to seek professional help

• If you have checked the basics and the car still won't start, or if you are unsure about testing electrical components, it's best to have a professional diagnose the issue. 
• A mechanic can use a diagnostic scanner to check for error codes from the engine control unit (ECU) or immobilizer system. 

2:072007 Toyota Camry wont start or go into neutral : r/MechanicAdviceRedditUnknown_Errorx · 3mo 0:272007 Camry will not start : r/AskMechanicsRedditsfly143 · 1y 0:2307 camry won't start. Starter or battery? : r/MechanicAdviceRedditOwn_Combination_9492 · 2y 0:08Toyota Camry won't start. Help!! : r/MechanicAdviceRedditThroatForward613 · 3mo 0:122007 Toyota Camry won't start : r/AskMechanicsRedditKaranpal13 · 5mo (function(){
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Where is the starter relay located on a 2007 Toyota Camry?

There's a cover here which we remove by lifting up on this tab right there. And you push in on this piece right here and lift upwards. The starter relay is this relay right here.

Where is the EFI relay on a 2007 Toyota Camry?

Find the 2007 Toyota Camry fuel pump relay inside the main under-hood fuse box near the battery. It's labeled "EFI," "FUEL PUMP," or similar in the box lid diagram. A second identical relay nearby is for the engine computer; check both if troubleshooting fuel delivery issues.