my Toyota Camry Eighth Generation (2018-present) battery dies when car is off what's wrong

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, ammeter, basic hand tools (socket set, screwdrivers).
• Ensure the vehicle is parked in a safe and well-ventilated area.
• Disconnect the negative battery terminal.

2. Perform Parasitic Draw Test

• Connect the ammeter in series with the negative battery terminal to measure current draw.
• Wait for the vehicle to enter sleep mode (typically 30 minutes after shutdown).
• Record the current draw. It should be less than 50 mA. If it exceeds this:
  • Sub-step: Remove fuses one at a time to identify the circuit causing the excessive draw.
  • Sub-step: Once identified, inspect the components on that circuit for faults.

3. Repair Faulty Component

• If a faulty component is found:
  • Sub-step: Remove the faulty electrical component (e.g., module or accessory).
  • Sub-step: Replace with a new or functioning component, ensuring correct installation.
  • Sub-step: Reconnect all wiring and secure all connections as per manufacturer specifications.

4. Test Battery and Charging System

• Sub-step: Reconnect the battery terminal.
• Sub-step: Start the vehicle and test the alternator output using a multimeter (should read around 13.8-14.5 volts while running).
• Sub-step: If the alternator is faulty, replace it according to factory specifications.

5. Final Assembly and Cleanup

• Ensure all tools are removed from the engine bay.
• Reinstall any panels or covers removed during the process.
• Dispose of any old parts or batteries in accordance with local regulations.