# Car Key Fob Not Locking or Unlocking 2019 Toyota 86

> ClearTheCode — Is your Car Key Fob Not Locking or Unlocking your 2019 Toyota 86? Discover common causes and practical troubleshooting steps to restore full remote functionality quickly.

Source: https://clearthecode.com/articles/car-key-fob-not-locking-unlocking-toyota-86-2019
Author: ClearTheCode

# Car Key Fob Not Locking or Unlocking 2019 Toyota 86

Experiencing a non-responsive key fob for your 2019 Toyota 86 can be frustrating, especially when you rely on it for quick and convenient access to your vehicle. Whether it's failing to lock, unlock, or even trigger the panic alarm, a malfunctioning key fob can disrupt your daily routine. This guide addresses the common reasons why your Toyota 86's key fob might stop working and provides practical steps to diagnose and fix the issue, helping you regain full control over your vehicle's remote functions.

## What drivers notice on this 2019 Toyota 86

Drivers typically notice an immediate lack of response when pressing any button on their 2019 Toyota 86 key fob. The most common observation is that the doors simply do not lock or unlock, despite repeated presses. There's no audible click from the door actuators, no flash of the turn signals, and the vehicle remains in its current locked or unlocked state. This can range from intermittent failures to a complete inability to communicate with the car, often leaving owners to use the physical key to enter the vehicle.

## At a glance: difficulty, repair cost, and diagnostic workflow

- **Difficulty Rating:** 6/10 — Moderate
- **Common Symptoms:** Complete unresponsiveness: Pressing any button (lock, unlock, trunk, panic) yields no reaction from the vehicle.; Intermittent functionality: The fob works sometimes, but not always, or only after multiple presses.; Reduced operating range: You need to be much closer to the vehicle than usual for the fob to work.; No LED indicator light: If your fob has an LED, it might not illuminate when buttons are pressed, indicating a power iss
- **Estimated Repair Cost:** $100–$900 (parts + typical shop labor)
- **OEM Tooling Required:** Standard OBD-II scanner and hand tools

**Diagnostic workflow:**
1. Confirm the symptom on your vehicle.
2. Scan for stored or pending codes with an OBD-II tool.
3. Inspect the most common causes in this guide (visual checks first).
4. Run verification tests before replacing parts.
5. Repair, clear codes, and verify on a test drive.

## Symptoms and warning signs

When your 2019 Toyota 86 key fob begins to fail, you might observe several distinct symptoms:

-   **Complete unresponsiveness:** Pressing any button (lock, unlock, trunk, panic) yields no reaction from the vehicle.
-   **Intermittent functionality:** The fob works sometimes, but not always, or only after multiple presses.
-   **Reduced operating range:** You need to be much closer to the vehicle than usual for the fob to work.
-   **No LED indicator light:** If your fob has an LED, it might not illuminate when buttons are pressed, indicating a power issue.
-   **Delayed response:** There's a noticeable lag between pressing a button and the vehicle reacting.
-   **Difficulty starting (for push-button start models):** While the fob primarily controls locking/unlocking, a weak fob battery can also affect the car's ability to detect the key for starting, sometimes requiring the fob to be held directly against the start button.

## How to verify and confirm the issue

Verifying the problem with your 2019 Toyota 86 key fob involves a series of simple checks to narrow down the potential cause:

-   **Try the spare key fob:** If you have a second fob, test it. If the spare works perfectly, the issue is almost certainly with the primary fob. If both fobs fail, the problem might lie with the vehicle's receiver or main battery.
-   **Replace the fob battery:** This is the most common fix. Open your key fob (typically a small flathead screwdriver or pry tool is needed) and replace the CR2032 (or similar) battery. Test the fob immediately after replacement.
-   **Manual lock/unlock:** Use the physical key blade hidden within your fob to manually lock and unlock the driver's door. This confirms the door lock mechanism itself is functional and isolates the problem to the remote system.
-   **Check vehicle's 12V battery:** A weak or dying car battery can sometimes affect the remote keyless entry receiver's performance. Ensure your vehicle's main battery is charged and in good health.
-   **Observe the fob's LED:** If your 2019 Toyota 86 fob has an LED, check if it lights up brightly and consistently when a button is pressed. A dim or absent light strongly suggests a dead or weak battery.
-   **Test in different locations:** Move your vehicle to a different area, away from potential sources of radio frequency interference like cell towers, radio stations, or even strong electrical lines, and retest the fob.

## Common causes (most likely first)

Understanding the most frequent culprits behind a non-functioning key fob can help you troubleshoot effectively:

-   **Dead or weak key fob battery:** By far the most common reason. Fob batteries typically last 2-3 years, but heavy use or extreme temperatures can shorten their lifespan.
-   **Key fob out of synchronization or programming lost:** Sometimes, the fob can lose its programming with the vehicle, especially after a battery change or if the vehicle's battery was disconnected.
-   **Damaged key fob:** Physical damage from drops, water exposure, or internal component failure can prevent the fob from transmitting a signal.
-   **Vehicle's keyless entry receiver fault:** The receiver unit within your 2019 Toyota 86, which listens for the fob's signal, can malfunction. This is less common but can happen due to electrical issues or damage.
-   **Low or dead vehicle 12V battery:** While the fob has its own battery, the car's main battery powers the receiver. A severely depleted car battery can prevent the system from operating correctly.
-   **Radio frequency interference (RFI):** Strong electromagnetic fields from nearby transmitters, power lines, or even other electronic devices can temporarily block the fob's signal.
-   **Blown fuse:** A dedicated fuse for the keyless entry system or Body Control Module (BCM) could be blown, though this is less common for isolated fob issues.

### Related guides on this vehicle

- [Key Fob Battery Replacement 2019 Toyota Corolla](/articles/key-fob-battery-replacement-3898-toyota-corolla-2019)
- [Gas Smell Inside Car Cabin While Driving 2019 Toyota Corolla](/articles/evap-system-gas-smell-cabin-toyota-corolla-2019)
- [1997 Toyota Avalon Won't Start After Sitting for Days](/articles/car-wont-start-after-sitting-3900-toyota-avalon-1997)

## Step-by-step diagnosis and fixes

Here’s a systematic approach to diagnosing and fixing your 2019 Toyota 86 key fob issue:

1.  **Replace the fob battery:** This should always be your first step. Refer to your Toyota 86 owner's manual for specific instructions on how to open the fob and the correct battery type (usually a CR2032 coin cell).
2.  **Inspect the key fob for damage:** Look for cracks, water intrusion, or corrosion on the battery terminals or circuit board. If damage is visible, the fob may need professional repair or replacement.
3.  **Attempt to reprogram the key fob:** Many Toyota vehicles have a manual programming sequence that can be performed by the owner. While specific steps vary, they often involve a series of door openings, key insertions, and button presses. Consult your owner's manual or an online resource for the 2019 Toyota 86's specific procedure. If this doesn't work, a dealership or locksmith with specialized tools can reprogram it.
4.  **Check your vehicle's 12V battery:** Ensure the car's main battery is fully charged and its terminals are clean and secure. A multimeter can be used to check its voltage (should be around 12.6V when off).
5.  **Check relevant fuses:** Locate your Toyota 86's fuse boxes (usually under the hood and/or inside the cabin). Consult your owner's manual to identify fuses related to the keyless entry system, door locks, or the Body Control Module (BCM). Visually inspect them for breaks in the filament and replace any blown fuses.
6.  **Consider environmental interference:** If the fob only fails in specific locations, interference is a strong possibility. Try moving your vehicle and testing again.
7.  **Scan for Diagnostic Trouble Codes (DTCs):** Although no specific OBD code is provided for this issue, a professional scan tool can sometimes reveal codes related to the Body Control Module (BCM) or keyless entry system, which could indicate a deeper electrical problem. For more general troubleshooting, explore All repair guides.

## Repair options and cost factors

Repairing a non-functioning key fob for your 2019 Toyota 86 can range from a simple DIY fix to a more involved professional service:

-   **DIY battery replacement:** This is the least expensive option, typically costing a few dollars for a new coin cell battery. It's often all that's needed.
-   **Fob reprogramming:** If the fob has lost its sync, a locksmith or Toyota dealership can reprogram it. This service generally costs between $50 and $150, depending on labor rates and complexity.
-   **New key fob purchase and programming:** If your existing fob is physically damaged or internally faulty, you'll need a new one. A new OEM Toyota 86 key fob can range from $150 to $300 or more, plus the cost of programming, bringing the total to $200-$450. Aftermarket fobs are cheaper but may not always work perfectly or be programmable.
-   **Keyless entry receiver module replacement:** If the issue is with the vehicle's receiver, this is a more complex and costly repair. The part itself can be several hundred dollars, plus significant labor costs for diagnosis and installation, potentially reaching $500-$1000+.

## When to see a professional

While many key fob issues can be resolved with basic troubleshooting, there are times when professional assistance is necessary:

-   **After trying all basic fixes:** If you've replaced the battery, checked for damage, and attempted reprogramming without success, it's time for a professional diagnosis.
-   **Both key fobs fail:** If both your primary and spare fobs stop working, it strongly suggests a problem with the vehicle's receiver, wiring, or BCM, which requires specialized tools and expertise to diagnose.
-   **Suspected vehicle-side issue:** If you suspect a problem with the car's keyless entry receiver, wiring, or a blown fuse you can't locate, a technician can perform a thorough diagnostic.
-   **Need new fob programming:** If you've purchased a new fob or your existing one needs advanced reprogramming, a Toyota dealership or a qualified automotive locksmith has the necessary equipment.

## Frequently asked questions

### Can a dead car battery affect my 2019 Toyota 86 key fob's function?
Yes, a severely discharged or dead 12V car battery can impact the key fob's functionality. The vehicle's keyless entry receiver relies on the car's main power supply to operate, so if the battery is too low, the receiver may not function correctly or at all, preventing it from responding to your fob's signal.

### How do I reprogram my 2019 Toyota 86 key fob?
Reprogramming a 2019 Toyota 86 key fob often involves a specific sequence of actions, such as opening and closing the driver's door, inserting and removing the key from the ignition, and pressing buttons on the fob. The exact steps can vary, so it's best to consult your owner's manual or a reliable Toyota-specific repair guide. If manual reprogramming fails, a professional with a diagnostic scan tool can perform the procedure.

### What type of battery does a 2019 Toyota 86 key fob use?
Most 2019 Toyota 86 key fobs use a CR2032 lithium coin cell battery. This is a common battery type, readily available at most electronics stores, supermarkets, and online retailers. Always double-check your owner's manual or open your specific fob to confirm the exact battery model before purchasing a replacement.

## Sources and further reading

For more detailed repair guides and troubleshooting tips for your Toyota 86 and other vehicles, please visit our All repair guides section. You can also [Browse vehicles](/vehicles) to find specific information tailored to your make and model. For additional Toyota-specific information, consider consulting your vehicle's owner's manual or official Toyota service bulletins found in [our comprehensive article library](/articles).

This information is for general guidance and is not a substitute for OEM service procedures; always use a qualified technician for safety-critical work.

## Explore related guides on ClearTheCode

- [Browse OBD-II codes](/codes)
- All repair guides