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Home/Cars/Toyota/Corolla/E210 (2019-2024)/why does my Toyota Corolla E210 (2019-2024) display a B2799 code?

why does my Toyota Corolla E210 (2019-2024) display a B2799 code?

Toyota Corolla E210 (2019-2024)

Error Codes
Severity: highDifficulty: mediumError Code: B27991-2 hours
3 min read
461 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix B2799 Smart Key issues in Toyota Corolla E210. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
B2799
Component
Electrical
Repair Time
1-2 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems to avoid shocks or shorts.

Symptoms

  • •Check engine light illuminated
  • •Failure to start the engine
  • •Key fob not detected
  • •Dashboard warning lights related to the immobilizer
  • •Intermittent issues with keyless entry

Diagnostic Steps

  1. 1Scan the vehicle’s onboard diagnostics using an OBD-II scanner to confirm the B2799 code and check for any additional codes.
  2. 2Inspect the key fob battery to ensure it is functioning properly and replace it if necessary.
  3. 3Verify the key fob's signal by using a key fob tester or checking the response when pressing the buttons.
  4. 4Check the Smart Key antenna for proper connection and function.
  5. 5Inspect wiring and connections between the Smart Key system components for damage or corrosion.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Ensure the vehicle is in a secure location.
  • Disconnect the battery to prevent any electrical shorts during repair.

2. Inspect Key Fob and Battery

  • Sub-steps:
    • Remove the key fob cover using a small flat-head screwdriver.
    • Replace the battery with a new CR2032 battery, ensuring correct orientation.
    • Reassemble the key fob and test the functions.

3. Check Smart Key Antenna

  • Sub-steps:
    • Locate the Smart Key antenna, typically located near the ignition switch.
    • Disconnect the antenna connector carefully.
    • Inspect the antenna for any visible damage.
    • Clean the connector pins and reconnect the antenna.

4. Repair Wiring and Connections

  • Sub-steps:
    • Visually inspect the wiring harness related to the Smart Key system.
    • Repair any frayed or damaged wires with heat shrink tubing.
    • Ensure all connections are tight and free from corrosion.

5. Reconnect Battery and Test

  • Sub-steps:
    • Reconnect the battery terminals.
    • Start the vehicle to check if the B2799 code persists.
    • Ensure that the key fob functions correctly and the vehicle starts.

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

  • OBD-II scanner
  • Small flat-head screwdriver
  • Multimeter

Parts Required

  • CR2032 key fob battery
  • Smart Key antenna (if damaged)

Additional Information

Error CodeB2799
Component

Electrical

Repair Time

1-2 hours

Difficulty

medium

Severity

high

Tools

3 items

Parts

2 items

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