how to fix my Toyota Corolla E170 (2013-2019) that won’t unlock with the key fob?

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

583 words

Problem Statement

Learn how to fix a key fob that won't unlock your 2013-2019 Toyota Corolla. Step-by-step guide with diagnostic steps and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on any electrical systems to prevent shock or short circuits.

Symptoms

•Key fob buttons do not respond
•Vehicle does not unlock when the key fob is pressed
•Indicators on the key fob do not light up
•Manual unlock with the key does not work (if applicable)
•Battery warning light on the dashboard (if related to the fob battery)

Diagnostic Steps

1
Check the key fob battery for charge using a multimeter or by replacing it with a new one.
2
Inspect the key fob for visible damage or wear.
3
Verify if the vehicle responds to the key fob when close to the vehicle (within 1-3 feet).
4
Attempt to unlock the vehicle using the spare key fob, if available.
5
Scan the vehicle’s onboard computer for any fault codes related to the keyless entry system using an OBD-II scanner.
6
Check the vehicle's keyless entry receiver for proper function and any loose connections.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Multimeter
•Small screwdriver
•Torx screwdriver
•OBD-II scanner (optional)

Parts Required

•Key fob battery (CR2032)
•Replacement keyless entry receiver (if necessary)

Related Faults

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Diagnostic Steps

1
Check the key fob battery for charge using a multimeter or by replacing it with a new one.
2
Inspect the key fob for visible damage or wear.
3
Verify if the vehicle responds to the key fob when close to the vehicle (within 1-3 feet).
4
Attempt to unlock the vehicle using the spare key fob, if available.
5
Scan the vehicle’s onboard computer for any fault codes related to the keyless entry system using an OBD-II scanner.
6
Check the vehicle's keyless entry receiver for proper function and any loose connections.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked in a safe area with ample space for work.
Disconnect the car battery to avoid any electrical issues during repair.

2. Replace Key Fob Battery

Tools Required: Small screwdriver, replacement battery (CR2032), key fob.
Open the key fob by using the small screwdriver to gently pry apart the two halves.
Remove the old battery and note the orientation (positive/negative).
Insert the new battery in the same orientation.
Snap the key fob back together, ensuring it is securely closed.

3. Reprogram Key Fob (if necessary)

Tools Required: None.
Sit in the vehicle with all doors closed.
Insert the key into the ignition and turn it to the "On" position (do not start the engine).
Turn the key from "On" to "Off" five times in rapid succession, ending in the "On" position. The door locks should cycle to indicate programming mode.
Press any button on the key fob within 30 seconds to program it to the vehicle.
Turn the ignition to "Off" to exit programming mode.

4. Inspect Keyless Entry Receiver

Tools Required: Torx screwdriver, multimeter.
Remove the cover from the keyless entry receiver located under the dashboard or near the driver’s side.
Check all wiring and connectors for damage or corrosion.
Use a multimeter to ensure the receiver is receiving power.
If the receiver is faulty, replace it with a new unit according to the manufacturer's specifications.