The turn signal relay on a Honda Accord is usually inside a fuse/relay box — most often under the driver’s side dash or in the engine bay. In newer Accords, the flasher function may be handled by the body-control module, so there isn’t a separate relay to replace.
Understanding where to look starts with recognizing that Honda has shifted turn-signal control in some generations. If your Accord is older, you’ll likely find a dedicated flasher relay in a fuse/relay box. If it’s a newer model, inspect how the lighting system is wired and be prepared for BCM-managed signaling rather than a standalone relay. This guide lays out common locations and steps to access them safely, plus what to check if signals aren’t working.
Where the relay is found, by generation
Use the following guidance to narrow down the most likely location for your model year. Each Accord can differ, so always check the fuse box diagram in the owner’s manual or on the cover of the box itself.
- Older Accords (roughly late 1990s to early 2010s): a dedicated turn-signal (flasher) relay is usually located in the interior fuse/relay box under the driver’s side dash or knee bolster.
- Mid-2010s to present (tenth generation and up, around 2018+): the turn-signal function is often integrated with the Body Control Module (BCM), which means there may be no separate flasher relay to replace.
- Engine-bay options: some models or markets place an exterior/green-labeled relay in the engine compartment fuse/relay box, sometimes labeled “Exterior Lighting,” “Turn Signal,” or “Flasher.”
If you cannot locate a clearly labeled flasher relay, consult the owner’s manual or the fuse box diagram printed on the inside of the relay box cover. If your signals aren’t working and you can’t find a distinct relay, the issue may involve the BCM or a blown fuse rather than a replaceable relay.
Safe steps to access the relay box
Before you begin, ensure you follow basic safety practices to avoid shorts or airbag-related issues. If you’re unsure, stop and consult a professional.
- Park the car in a safe, level spot, turn off the ignition, and set the parking brake. Remove the key to prevent any electrical activation while you work.
- Locate the fuse/relay boxes: interior box under the driver's side dash (often in the knee area) and the engine bay box near the firewall or near the strut tower. Check the diagram on the underside of the box cover to identify the flasher or exterior-light relays.
- Disconnect the negative battery terminal if you’ll be handling the relays directly or if you’re working near airbag circuits. This reduces the risk of accidental shorts while you remove or reseat components.
- Carefully remove the relay box cover and, using the diagram, locate the relay labeled “Turn Signal,” “Flasher,” or “Exterior Lighting.”
- Gently pull the relay straight out with a relay puller or pliers with insulated handles. Inspect the relay for signs of burn marks or a melted plastic housing. If it’s damaged, replace it with the exact same type and ratings.
- If no separate relay is found or if the label points to BCM control, do not replace a non-existent relay. Instead, test related fuses and seek professional diagnosis for BCM-related issues.
After performing these steps, re-seat the cover, reconnect the battery if you disconnected it, and test the turn signals to see if the issue is resolved.
Diagnostic steps if the turn signals still don’t work
When signals fail, it helps to follow a structured diagnostic checklist. The exact steps may vary based on whether your model uses a separate relay or BCM control.
- Check the fuse(s) labeled for Turn Signals, Exterior Lighting, or Lighting in both the interior and engine-bay fuse boxes. Replace any blown fuses with the same amperage.
- Inspect the bulbs for the left and right signals. Burned-out bulbs will prevent signals from functioning even if the relay is fine.
- Test the hazard lights. If hazards work but individual turn signals don’t, the problem is likely in the turn-signal circuit rather than the BCM.
- If a separate flasher relay is present and accessible, swap in a known-good relay of the same type to rule out a defective unit.
- For newer Accords where the BCM controls signaling, look for related BCM fuses and consult service data if you suspect a BCM fault. A professional diagnostic tool may be required to read fault codes.
- If you’re unable to locate a replaceable relay or the problem persists after replacing fuses or bulbs, contact a Honda technician for a precise diagnosis.
These diagnostics can help differentiate between simple component failures (bulbs, fuses) and more complex electrical or BCM issues.
Summary
In short, Access to the turn signal relay on a Honda Accord depends on the model year. Many older Accords use a dedicated flasher relay in the interior fuse/relay box, typically under the driver’s dash. Newer models increasingly integrate signaling control in the BCM, which means there may be no standalone relay to replace. Always verify with the owner’s manual fuse box diagram, and approach any work near the BCM with care or seek professional help. Regular checks of fuses and bulbs are a good starting point for turning signal problems, and a systematic diagnostic approach will save time and avoid unnecessary parts replacements.