my Toyota Corolla E210 (2019-2024) battery dies after a few days, what to check?

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, wrench set, ammeter.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the negative battery terminal to ensure safety.

2. Battery Replacement

1. Remove Old Battery:
   • Use a socket wrench to remove the negative and positive terminals from the battery.
   • Unbolt the battery clamp holding the battery in place and carefully lift out the old battery.
2. Install New Battery:
   • Place the new battery in the tray and secure it with the battery clamp.
   • Connect the positive terminal first, followed by the negative terminal.

3. Address Parasitic Draw

1. Identify the Cause:
   • If excessive draw was found, systematically remove fuses one at a time while monitoring the ammeter until the draw drops to acceptable levels.
   • Identify the circuit responsible for the drain and repair or replace the faulty component.

4. Verify Charging System

1. Test Alternator:
   • After replacing the battery, start the engine and measure voltage at the battery terminals again to ensure charging voltage is within the acceptable range.