Lexus Dead Car Battery Replacement DIY

Is your Lexus not starting due to a dead battery? Learn how to fix the problem by replacing the battery of your Lexus.

What you will need

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• Car Battery – Group size should be printed on the old battery housing.
• 10mm Open End Wrench
• Battery Terminal Brush
• Battery Protector
• Electrical Tape
• Gloves
• Safety Glasses

Procedure

1. Pull the hood release under the hood. 
2. Slide your hand under the hood and depress the safety lever under the hood to open the hood.
   • 1991-Lexus-LS400 opening hood
   • 2016-Lexus-GX-460 opening hood
   • 2007-Lexus-IS-250 opening hood
3. Gently remove the battery terminal covers (Be careful to avoid bridging the battery with tools)
   • Removing battery covers on 2004-Lexus-ES-330
   • Removing battery covers on 2010-Lexus-ES-350
4. Use the 10 mm open-end wrench to loosen (not remove) the nut on the negative battery terminal. The negative terminal is designated with a negative sign ( – )
   • Lexus ES350 2010 battery negative terminal
5. Disconnect the negative terminal from the battery post.
6. Remove the positive (red cable) from the battery positive (+) post. Isolate both ends of the connectors to avoid shorts. 
   • 2010-Lexus-ES-350 battery positive terminal
7. Use a 10 mm wrench to remove the bracket on top of the battery. 
8. Remove the old battery.
9. Clean the battery bay and the connectors to remove the corrosion that builds up over time.
10. Fit in your new battery carefully on the battery tray.
11. Reinstall the bracket. Do not over-tighten the bracket, or you risk cracking the battery case. 
12. Use a wire brush to clean the battery terminals.
13. Connect the positive terminal first and make sure it is tight and secure.
14. Connect the negative terminal last.
15. Reinstall the battery terminal covers.
16. Dispose of your old battery properly. If you were charged a core fee when the new battery was purchased, return it to the store for a core refund.
17. Press unlock on your keyfob. Enter the vehicle and start the engine. If your car has a keyless start, start the engine by pressing the Start/Stop button. 
18. Synchronize windows and set radio stations.

Changing the car battery on a Lexus is an easy job you can perform at home. Do not short the battery terminals, or you risk causing electrical problems or blowing a fuse, preventing you from starting your Lexus. We do not recommend using a backup battery to keep the vehicle powered when changing the battery.

Ways to Take Care of Your Car’s Battery

• Perform regular maintenance on your car’s electrical system, like cleaning the terminals from corrosion.
• Avoid short trips as much as possible to allow the battery to charge through your car’s charging system.
• Limit parasitic drain by having your electrical accessories disconnected when storing the vehicle.
• Limit extreme temperature exposure to reduce the strain on the batteries.
• You can install a battery disconnect switch when storing the vehicle to avoid draining the battery.

We hope you find the Lexus Dead Car Battery Replacement DIY guide helpful. Check these troubleshooting and repair guides for more help on your Lexus.