what does it mean when my Toyota Camry Eighth Generation (2018-present) shows a B2799 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked and turned off.
• Disconnect the negative battery terminal for safety.

2. Replace Key Fob Battery

• Tools Required: Small screwdriver, replacement battery (CR2032).
• Open the key fob by removing the screws or using a small flat tool to pry it open.
• Take out the old battery and replace it with the new one, ensuring the polarity is correct.
• Reassemble the key fob and test the function.

3. Check Smart Key ECU

• Tools Required: OBD-II scanner, multimeter.
• Locate the Smart Key ECU (usually under the dashboard near the steering column).
• Inspect the ECU for any physical damage or signs of wear.
• Use a multimeter to check the voltage supply to the ECU to ensure it is receiving power.

4. Reprogram Key Fob

• Tools Required: OBD-II scanner with programming capabilities.
• Follow the programming procedure outlined in the vehicle's service manual:
  • Insert the key into the ignition and turn it to the "ON" position without starting the engine.
  • Use the OBD-II scanner to enter the programming mode and follow the prompts to program the key fob.
• Confirm that the key fob is now recognized and functioning properly.

5. Reset ECU

• Tools Required: OBD-II scanner.
• Reconnect the negative battery terminal.
• Use the OBD-II scanner to reset the ECU and clear any stored codes.
• Drive the vehicle for a short period to ensure the system operates correctly after the reset.