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If the immobilizer isn't functioning in your 2005 Toyota Corolla, the initial step is to attempt a reset. This process is straightforward and can be completed in just a few minutes. Start by unlocking the vehicle and entering it. Next, insert the key into the ignition cylinder. Turn the key from the off to on position three times without starting the car. Observe the immobilizer light on the dashboard - once it turns off, you can then start the vehicle, indicating that the immobilizer has been successfully reset, allowing you to drive as usual.
To reprogram the immobilizer for a 2005 Toyota Corolla, you have to use the original key and turn it in the ignition three times to sync the key with the car again.