Maintenance and care -> Battery for Your Toyota 4 Runner SUV Fifth Generation (2010-2024)

422  
6-3. Do-it-yourself maintenance  
WARNING  
When checking the reservoir  
Take care as the reservoir may be hot.  
NOTICE  
When adding fluid  
Avoid overfilling, or the power steering may be damaged.  
After replacing the reservoir cap  
Check the steering box case, vane pump and hose connections for leaks or  
damage.  
Battery  
Check the battery as follows.  
Battery exterior  
Make sure that the battery terminals are not corroded and that  
there are no loose connections, cracks, or loose clamps.  
Terminals  
1
Hold-down clamp  
2
Before recharging  
When recharging, the battery produces hydrogen gas which is flammable and  
explosive. Therefore, observe the following before recharging:  
If recharging with the battery installed on the vehicle, be sure to disconnect  
the ground cable.  
Make sure the power switch on the charger is off when connecting and dis-  
connecting the charger cables to the battery.  
4RUNNER (U)  
423  
6-3. Do-it-yourself maintenance  
After recharging/reconnecting the battery  
The engine may not start. Follow the procedure below to initialize the system.  
1
Shift the shift lever to P.  
Open and close any of the doors.  
Restart the engine.  
2
3
Unlocking the doors using the smart key system may not be possible imme-  
diately after reconnecting the battery. If this happens, use the wireless  
remote control or the mechanical key to lock/unlock the doors.  
Start the engine with the engine switch in ACCESSORY mode. The engine  
may not start when the engine switch turned from off. However, the engine  
will operate normally from the second attempt.  
The engine switch mode is recorded by the vehicle. If the battery is recon-  
nected, the vehicle will return the engine switch mode to the status it was in  
before the battery was disconnected. Make sure to turn off the engine  
before disconnect the battery. Take extra care when connecting the battery  
if the engine switch mode prior to discharge is unknown.  
If the system will not start even after multiple attempts, contact your Toyota  
dealer.  
WARNING  
Chemicals in the battery  
Batteries contain poisonous and corrosive sulfuric acid and may produce  
hydrogen gas which is flammable and explosive. To reduce the risk of death  
or serious injury, take the following precautions while working on or near the  
battery:  
6
Do not cause sparks by touching the battery terminals with tools.  
Do not smoke or light a match near the battery.  
Avoid contact with eyes, skin and clothes.  
Never inhale or swallow electrolyte.  
Wear protective safety glasses when working near the battery.  
Keep children away from the battery.  
4RUNNER (U)  
424  
6-3. Do-it-yourself maintenance  
WARNING  
Where to safely charge the battery  
Always charge the battery in an open area. Do not charge the battery in a  
garage or closed room where there is insufficient ventilation.  
How to recharge the battery  
Only perform a slow charge (5 A or less). The battery may explode if  
charged at a quicker rate.  
Emergency measures regarding electrolyte  
If electrolyte gets in your eyes  
Flush your eyes with clean water for at least 15 minutes and get immedi-  
ate medical attention. If possible, continue to apply water with a sponge or  
cloth while traveling to the nearest medical facility.  
If electrolyte gets on your skin  
Wash the affected area thoroughly. If you feel pain or burning, get medical  
attention immediately.  
If electrolyte gets on your clothes  
It can soak through clothing on to your skin. Immediately take off the cloth-  
ing and follow the procedure above if necessary.  
If you accidentally swallow electrolyte  
Drink a large quantity of water or milk. Get emergency medical attention  
immediately.  
NOTICE  
When recharging the battery  
Never recharge the battery while the engine is running. Also, be sure all  
accessories are turned off.  
4RUNNER (U)