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Lexus Dead Car Battery Replacement DIY

This guide provides step-by-step instructions on how to replace a Lexus car battery.

Lexus Dead Car Battery Replacement DIY
DIY COST $110-$230


What you will need


  1. Pull the hood release under the hood. 2015-Lexus-NX-200T release lever
  2. Slide your hand under the hood and depress the safety lever under the hood to open the hood.1991-Lexus-LS400 opening hood
    • 1991-Lexus-LS400 opening hood 2016-Lexus-GX-460
    • 2016-Lexus-GX-460 opening hood2007-Lexus-IS-250 opening hood
    • 2007-Lexus-IS-250 opening hood
  3. Gently remove the battery terminal covers (Be careful to avoid bridging the battery with tools)2004-Lexus-ES-330 removing battery covers
    • Removing battery covers on 2004-Lexus-ES-330 removing battery covers on 2010-Lexus-ES-350
    • 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
    • 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
    • 2010-Lexus-ES-350 battery positive terminal
  7. Use a 10 mm wrench to remove the bracket on top of the battery. lexus battery bracket
  8. Remove the old battery.
  9. Clean the battery bay and the connectors to remove the corrosion which 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. 2016-Lexus-GX-460 battery bracket
  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 to receive 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. start lexus after chaning battery


  18. Synchronize windows and set radio stations. 

Changing the car battery on a Lexus is an easy job that you can perform at home. Do not short the battery terminals, or you risk causing electrical problems or blowing a fuse, which will prevent you from starting your Lexus. 

We do not recommend using a backup battery to keep the vehicle powered on when changing the battery. 


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Safety Tips

Auto Repair Safety Notes


Torque specifications

  • + / - Battery Terminal 10mm nuts: 10Nm ( 7.4 lb-ft)
  • Battery Mounting Bracket: 15 Nm (10 lb-ft)

*These are typical values and may be slightly different than what the manufacturer recommends. 

Tips & Warnings

  • Make sure the battery terminals are on tight. If the battery terminals are loose the battery may not charge properly. The engine may not start. 
  • If the battery light stays on even with a new battery installed, there is a high chance the alternator is defective. 
  • If the engine doesn't start, the battery may be discharged and may need a recharge. 
  • ABS and traction control may be on when the engine is restarting. These lights will reset automatically after a few minutes of driving. 
  • Charge the battery fully then test it with a battery tester. For more help follow this guide. Check the battery date sticker on the top or side of battery. Most car batteries last between three to five years.
  • During charging and jump-starting, explosive gases can escape from the battery. There is a risk of an explosion. Particularly avoid fire, open flames, creating sparks, and smoking. Ensure there is sufficient ventilation while charging and jump-starting. Do not lean over a battery.
  • Make sure that the positive terminal of a connected battery does not come into contact with vehicle parts. Never place metal objects or tools on a battery. It is important that you observe the described order of the battery terminals when connecting and disconnecting a battery. 
  • When jump-starting, make sure that the battery poles with identical polarity are connected. It is particularly important to observe the described order when connecting and disconnecting the jumper cables. Never connect or disconnect the battery terminals while the engine is running
  • Make sure the jumper cables are not damaged or wires are exposed. 
  • The jumper cables should not contact the parts that can move when the engine is running, such as the V-belt pulley or the fan.

Frequently Asked Questions

How to get into the trunk, if you have a dead battery

  • Use the emergency key blade found inside your key fob to manually unlock the trunk. 

How to charge a dead battery

  • By trickle charging a dead battery, you have a better chance of bringing the battery back to life. Otherwise, your battery may no longer hold a proper charge. 
  • Use the OEM 12 Volt Battery Charger or even the cheaper Black+Decker BBM3B 12V Battery Charger Maintainer, which works just as well.
  • It will take at least 24 hours to bring a completely dead battery back to life. You are only providing 2 Amperes to the battery, which is a slow charge but ensures no damage is caused to the battery cells. 

My car battery keeps dying

  • If your battery keeps on dying or is not holding a proper charge, it could be due to any of the following:  
    • Battery age / old battery
    • Corroded or loose battery connections
    • Parasitic current drains in the electrical system.