Introduction
This guide will teach you how to replace the 12V battery in a 2nd-generation Prius. The 12V battery is an essential component of the hybrid car that allows the accessory mode and the hybrid battery system to start up. The 12V battery can be depleted over time or be drained accidentally, making it necessary to replace the battery earlier than expected. When the battery stops working, accessory features such as radio, headlights, and dashboard lights will not start up. Because of the hybrid features of the car, if the 12V battery loses power, the hybrid control system will also stop working, causing error messages and severe safety issues such as braking problems and a switch to gasoline-only driving, which is not intended for this vehicle and will affect driving.
It is a good idea to replace the battery before it is completely drained, with the car often showing early signs such as dimming headlights, flickering car lights, or startup failures.
Before you begin this repair, turn off your car, put it in park with the emergency brake, and make sure that the car has cooled off if it has been driven recently. In addition, this is a large battery so be very careful disconnecting the battery terminal.
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Disconnect the three connectors from the boxes.
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Firmly squeeze the connectors' tabs and pull away from the connection box.
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Remove the connector in the same manner, or proceed to the next step and disconnect it from the unbolted control box for easier access.
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Use a socket wrench to remove the two 10 mm bolts holding the battery exhaust pipe.
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Pull out the exhaust pipe and the battery vent.
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Disconnect the terminal connectors from the battery using a socket wrench.
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Remove the negative connection held by a 10 mm bolt.
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Loosen the 10 mm bolt so that the positive terminal brackets open up.
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To reassemble your device, follow these instructions in reverse order.
3 comments
アメリカで2009年プリウスの12vバッテリーを1週間ほど前に交換しました。突然セキュリティのベルというかビービービーと鳴り出して困っています。ホーンのヒューズを外しましたがそれでも鳴り出して困っています。どうしたら止められますか？
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If honking is occurring it is likely the replacement battery is discharged. Since driving it can help charge the battery, you can try recharging it with driving but it usually would take a longer drive and might not be the best option if your dashboard is having issues. I would start by turning the car on and off in 10 second intervals and see what the dashboard is looking like and if it goes away after around 3 restarts. Depending on where you have the battery right now, do the above and see if you see errors/use a code reader if available. Check codes or errors and then remove the battery and check the voltage of the battery with a voltage tester or have it tested somewhere/ recharged. You might have to recharge the battery yourself if you are sure you want to continue using the battery replacement purchased. It is highly recommended that you DO NOT reverse polarities, this can cause expensive damage.
How do you reset the system if the battery was completely discharged? I replaced the battery but have system issues. Dashboard lights dont light up and some other issues.