why does my Toyota Camry Eighth Generation (2018-present) battery die when parked overnight

Solution

1. Preparation

• Tools Required: Multimeter, ammeter, socket set, wire brush, battery terminal cleaner
• Ensure the vehicle is parked on a level surface and the engine is off before beginning work.

2. Inspect and Clean Battery Connections

• Use a wire brush to clean any corrosion from the battery terminals and cable connectors.
• Ensure that both the positive and negative cables are securely connected to the battery posts.

3. Test and Replace the Battery (if necessary)

• If the battery voltage is below 12.4 volts or the capacity test fails, replace the battery.
• Sub-steps:
  1. Disconnect the negative cable first, followed by the positive cable.
  2. Remove the battery hold-down bracket using a socket set.
  3. Carefully lift the battery out of the tray and place the new battery in.
  4. Reconnect the positive cable first, then the negative cable.
  5. Tighten all connections securely.

4. Address Parasitic Drain

• If parasitic draw is measured above 50mA, identify the circuit causing the drain.
• Sub-steps:
  1. With the ammeter still connected, pull fuses one by one until the current draw drops significantly.
  2. Identify which component is associated with the fuse that caused the draw.
  3. Repair or replace any faulty components, wiring, or modules that may be causing the drain.