how to diagnose electrical issues in my BMW 5 Series G30/G31 (2017-2024)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety during electrical work.
• Tools required: OBD-II scanner, multimeter, socket set, wire brush (for cleaning terminals).

2. Battery Maintenance

• Check Voltage:
  • Measure battery voltage with the multimeter. If below 12.4 volts, recharge or replace the battery.
• Clean Connections:
  • Remove terminals and clean with a wire brush. Reconnect securely.

3. Fuse Inspection and Replacement

• Locate Fuse Box:
  • Refer to the owner's manual for the fuse box location.
• Inspect and Replace:
  • Check each fuse with a visual inspection or a multimeter. Replace any blown fuses with the same amperage rating.

4. Ground Connection Inspection

• Locate Ground Points:
  • Identify all ground points related to the affected components.
• Inspect and Clean:
  • Remove ground cables, clean contact surfaces, and reattach securely.

5. Component Testing

• Power Verification:
  • Activate components (e.g., windows, locks) while measuring voltage with a multimeter at the component terminals. If voltage is absent, trace the wiring back to the source.
• Repair or Replace Faulty Components:
  • Replace any faulty components as necessary based on testing results.