how do i reset my lexus after replacing the battery

How to Reset Your Lexus After Replacing the Battery?

When replacing the battery in your Lexus, it’s essential to follow the correct procedure to ensure that the car’s systems function smoothly. The battery replacement process may cause certain systems, such as the electronic control unit (ECU), to reset. In this article, we will guide you through the steps to reset your Lexus after replacing the battery, allowing you to avoid any potential issues and ensure optimal performance.

Run the Car for 20 to 30 Minutes

Before attempting any reset procedures, start by running your Lexus for about 20 to 30 minutes. This step is crucial as it allows the car’s alternator to charge the new battery fully. The alternator generates electricity while the car is running, and this charging process ensures that the battery is ready to power the vehicle’s systems effectively.

Resetting the Vehicle’s Computer (ECU)

The replacement of the battery may cause the ECU, which is responsible for reading data from various vehicle sensors and controlling engine performance, to reset. To reset the ECU, you have a few options:

Automatic Reset

In many cases, the ECU will reset itself as you drive the car after reconnecting the new battery. The system will gradually adapt to the new settings and parameters.

Manual Reset

If the ECU doesn’t reset automatically, you can perform a manual reset using one of the following methods:

Disconnect Battery Terminal

Use a small wrench to detach the positive battery terminal (red) for about five to fifteen minutes. Then, reattach the terminal securely. This procedure helps discharge any remaining electrical energy in the system, effectively resetting the ECU.

OBD-II Scanner

If you have access to an OBD-II scanner, you can use it to clear any error codes and reset the ECU. Simply follow the scanner’s instructions to perform the reset.

Reprogram Radio Presets and Anti-Theft System

After replacing the battery, you might find that your radio presets and anti-theft system have been reset. To reprogram the radio presets, follow these steps:

Reprogram Radio Presets

Tune in to your desired radio station, and then press and hold the preset button associated with the station until the screen displays the chosen number. Repeat this process for each of your preferred stations.

Reset the Anti-Theft System

Consult your Lexus owner’s manual for instructions on resetting the anti-theft system. The process may vary depending on the model and year of your vehicle.

Cleaning Battery Terminals

To ensure the longevity of your new battery, regular maintenance is essential. One crucial maintenance task is cleaning the battery terminals. Corrosion on the terminals can hinder the battery’s performance. Here’s how to clean them:

Turn off the Car and Disconnect Battery

Before cleaning the terminals, turn off your car and disconnect the battery by removing the negative terminal (black) first and then the positive terminal (red).

Scrub Away Corrosion

Using an old toothbrush and a baking soda solution, gently scrub away any corrosion or debris from the battery terminals and cable connectors.

Wipe and Apply Petroleum Jelly

After cleaning, wipe the terminals and connectors dry. Then, apply a small amount of petroleum jelly to the terminals to lubricate and protect them from future corrosion.


Resetting your Lexus after replacing the battery is a simple yet crucial process to ensure that all systems work harmoniously. By following these steps, you can avoid potential issues and maintain optimal performance. Properly resetting the ECU, reprogramming radio presets, and cleaning battery terminals are all essential tasks to keep your Lexus running smoothly.


The lifespan of a car battery varies depending on factors such as usage and climate. Generally, a car battery needs replacement every three to five years.

In some cases, you can reset the ECU without disconnecting the battery by using an OBD-II scanner to clear error codes.

Resetting the ECU may not directly improve fuel efficiency. However, it allows the system to recalibrate and optimize engine performance, potentially leading to better fuel economy over time.

Signs of a failing battery include slow cranking, dimming lights, and difficulty starting the car. If you notice any of these symptoms, it may be time to replace your battery.

While jump-starting your car can provide a temporary power source, it won’t reset the ECU. For a proper ECU reset, follow the recommended procedures mentioned in this article.

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