Two common places: the engine compartment fuse/relay box or the interior under-dash fuse/relay box on the passenger side. Check the lid diagram on each box for EFI MAIN RELAY or ECM POWER to confirm which relay controls the ECM for your exact vehicle.
Common locations for the ECM/EFI main relay
In most 2007 CR-V models, the ECM/EFI main relay is tucked into one of Honda's standard fuse/relay boxes. The exact box and the label can vary by VIN, so consult the diagram inside the lid or the official service manual for your car.
Engine compartment fuse/relay box
In the engine bay, look for a relay labeled EFI MAIN, EFI, or ECM POWER. This box is typically near the battery or on the inner fender, and the lid diagram should confirm the EFI relay location.
- Open the fuse/relay box cover and locate the relay with the EFI/ECM labeling.
- Check the relay’s position against the diagram to verify it’s the EFI main relay.
- If replacing, use the exact relay type and reconnect all terminals firmly; avoid forcing connections.
If the EFI/ECM relay isn’t present in the engine compartment box for your car, the relay may be in the interior fuse box instead.
Interior fuse/relay box (under-dash, passenger side)
On some 2007 CR-Vs, the EFI main relay sits in the under-dash fuse/relay box on the passenger side. The lid diagram will usually show EFI MAIN RELAY or ECM POWER.
- Access by removing the lower dash panel or kick panel to reach the fuse box; consult the diagram inside the cover.
- Identify the relay labeled EFI MAIN RELAY or EFI; confirm with the diagram before removing.
- For testing, you can swap with an identical spare or use a multimeter to verify the coil and switch sides per service manual guidance; never bypass safety circuits.
If you still can’t locate the relay after checking both boxes, consult the VIN-specific Honda service information or a dealer for the exact layout.
What to do if you can't find it (in brief)
Regional variations can place the ECM relay in different spots. Use the vehicle’s manual, a service manual, or Honda’s parts diagrams for your exact VIN to confirm the ECM relay’s location.
Summary
For a 2007 Honda CR-V, the ECM/EFI main relay is usually found in either the engine compartment fuse/relay box or the interior under-dash fuse/relay box on the passenger side. Verify the exact location using the lid diagrams on the fuse boxes or your vehicle’s service manual, then proceed with testing or replacement as needed.