In most Honda Odyssey models, the A/C compressor clutch relay sits in the engine bay fuse/relay box, labeled "A/C" or "AC CLUTCH" on the box lid. This is the common and easiest place to start when troubleshooting or replacing the relay.
The Odyssey has evolved through multiple generations, and while the engine bay fuse/relay box is the standard home for the A/C relay, some model years may use additional relays or fuse spots in other boxes. Always check the diagram on the fuse box cover for the exact labeling and location for your year and trim.
Common locations for the A/C relay
To help you pinpoint the relay, here are the typical spots used across many Odyssey generations. Refer to the diagram on the fuse box cover for the precise labeling on your vehicle.
- Engine bay fuse/relay box (under-hood). This is the primary location on most Odysseys. Look for a 4-pin or 5-pin relay labeled “A/C,” “AC,” or “AC CLUTCH” on the lid diagram or the relay itself.
- Interior fuse box (less common, but possible on some trims). If you don’t find an A/C relay in the engine bay box, check the under-dash interior fuse box and inspect the diagram for an A/C relay or a relay labeled related to the climate control system.
In practice, the engine bay fuse/relay box is the fastest place to start, and it remains the most common location across current and recent model years. If you’re unsure after inspecting both boxes, consult the owner’s manual or a wiring diagram for your exact year.
How to identify the exact relay on your Odyssey
Once you locate the fuse/relay box, use these steps to confirm you’ve found the A/C relay and not a different component.
- Open the hood and locate the engine bay fuse/relay box. It’s usually near the battery or along the edge of the engine bay.
- Remove the lid and read the diagram on the inside of the cover. Look for labels such as “A/C,” “AC CLUTCH,” or a symbol representing the compressor clutch.
- Inspect the relay: A/C relays are typically small blocks with 4 or 5 pins. If you’re replacing, ensure you’re pulling the correct one and not a nearby relay with a different function.
- With the ignition off, carefully reseat the relay or swap it with a known-good relay of the same type to test if the A/C engages or not (only if you’re comfortable doing so and you’ve disconnected power first).
- If the relay is not labeled or you’re unable to locate it, consult the service manual or contact a qualified technician for model-year-specific guidance.
Following these steps helps verify the A/C relay location and confirms whether the relay or the compressor circuit might be at fault.
Summary
The most reliable starting point for locating the A/C relay on a Honda Odyssey is the engine bay fuse/relay box, where it is typically labeled “A/C” or “AC CLUTCH.” If it’s not there, check the interior fuse box using its diagram. Always refer to your specific model-year fuse box diagram, as labeling and exact placement can vary. If you’re unsure or the issue persists, seek professional assistance to avoid damage to the electrical system.