my Toyota RAV4 XA50 (2019-2024) has a parasitic battery drain issue, how to diagnose?

Solution

1. Preparation

• Tools Required: Multimeter, ammeter, socket set, fuse puller, wiring diagram.
• Safety Warnings: Disconnect the negative battery terminal before working on electrical systems.

2. Battery Replacement (if necessary)

• Sub-steps:
  1. Disconnect the negative terminal first, followed by the positive terminal.
  2. Remove the battery hold-down bracket using a socket set.
  3. Carefully lift the battery out of the tray.
  4. Install the new battery, ensuring the positive terminal is connected first, then the negative terminal.
  5. Recheck battery voltage to ensure it reads approximately 12.6 volts.

3. Repair Faulty Circuit

• Sub-steps:
  1. Identify the component causing the drain based on the fuse pull test.
  2. If a relay is stuck, replace it with a new one.
  3. If a module is faulty (e.g., a door module), replace the module as per manufacturer's specifications.
  4. Ensure all connections are tight and free of corrosion.
  5. Reinstall the fuses and reconnect the battery.

4. Final Checks

• Sub-steps:
  1. Recheck current draw with the ammeter after repairs to ensure it is within acceptable limits.
  2. Test all affected electrical components for proper operation.
  3. Monitor the vehicle over several days to confirm the issue is resolved.