2025 4Runner (6th Gen) Battery Jump Start & Replacement

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What to Do When Your Battery Dies and How to Replace It Safely

(Reference: 2025 Owner’s Manual, pg. 608–612)
Link to Owners Manual: https://trail4runner.com/wp-content/uploads/2025/03/2025-4runner-owners-manual.pdf

If your 4Runner won’t start due to a dead battery, you can use jumper cables and a second vehicle to get back on the road. The Owner’s Manual provides clear steps for both jump-starting and battery replacement, including important safety precautions.

Jump-Starting the Battery​

1. Confirm that you have the smart key inside the vehicle
2. Open the hood (pg. 528)
3. Connect the jumper cables in this order:
   
   • Positive (+) clamp to your 4Runner
   • Positive (+) clamp to second vehicle
   • Negative (–) clamp to second vehicle
   • Final Negative (–) clamp to metallic grounding point on your 4Runner
4. Start the engine of the second vehicle and maintain a slight throttle for ~5 minutes
5. Open and close a door on the 4Runner with the engine switch OFF
6. Attempt to start your 4Runner
7. Once the engine is running, remove the jumper cables in reverse order

Important: The engine cannot be started via push-starting. If jump-starting fails, have the battery inspected or replaced.

Battery Replacement Guidelines​

• Battery location: driver side under the hood
• Use only the same size and rating battery:
  
  • Type C (LN4): 75Ah (20HR) or greater, 776 CCA or greater
  • Stop & Start Models require Toyota-approved batteries
• Remove the negative terminal first
• After reinstallation, the smart key, engine switch mode, and multimedia system may require re-initialization

Safety Warnings​

• Never allow clamps to touch each other or other metal surfaces
• Wear gloves and eye protection when working near the battery
• Do not smoke or allow open flames nearby
• Electrolyte can cause severe burns—flush with water and seek medical attention if exposed

2025 4Runner Battery Jump Start & Replacement Diagram​

Refer to pages 608–612 in the Owner’s Manual for illustrations of jumper cable connections and battery layout.