how to troubleshoot my Toyota RAV4 Fifth Generation (2019-present) electrical issues

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Battery Inspection

• Tools Required: Multimeter
• Check battery voltage:
  • Use the multimeter to measure the battery voltage.
  • If the voltage is below 12.4 volts, replace the battery if it is old or defective.
• Clean battery terminals if corrosion is found:
  • Use a wire brush to clean terminals and apply a terminal protector spray.

3. Fuse and Relay Check

• Tools Required: Fuse puller or pliers
• Locate the fuse box:
  • Access the owner’s manual for the fuse box location and layout.
• Inspect each fuse:
  • Remove fuses one by one and check for continuity.
  • Replace any blown fuses with the same amperage rating.
• Test relays:
  • Swap suspected faulty relays with known good ones to check functionality.

4. Wiring Inspection

• Tools Required: Visual inspection tools, multimeter
• Check wiring harnesses:
  • Inspect for visible damage or disconnections.
  • Repair any damaged wires or replace the harness section if necessary.
• Verify ground connections:
  • Ensure all ground wires are securely fastened to the chassis.
  • Clean any corroded ground connections.

5. System Testing

• Reconnect the battery:
  • Attach the negative battery terminal securely.
• Test all electrical components:
  • Verify the functionality of windows, locks, lights, and infotainment systems.