how to fix my BMW 3 Series G20/G21 (2019-2024) if the dashboard lights are flashing?

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, screwdrivers, and safety gloves.
• Ensure the vehicle is parked on a level surface and the engine is off.

2. Battery Inspection

• Step 1: Disconnect the negative battery terminal using a socket wrench.
• Step 2: Clean the battery terminals and connectors with a wire brush to remove corrosion.
• Step 3: Reconnect the negative battery terminal and ensure it is tight.

3. Fuse Inspection

• Step 1: Locate the fuse box (refer to the owner's manual for the exact location).
• Step 2: Remove the fuse cover and check each fuse related to the dashboard and electrical systems.
• Step 3: Replace any blown fuses with the same amperage rating.

4. Alternator Testing

• Step 1: Start the engine and use a multimeter to measure the voltage at the battery terminals.
• Step 2: The reading should be between 13.7 to 14.7 volts; if not, the alternator may need replacement.
• Step 3: If the alternator is not charging properly, remove it (disconnect the battery again and follow manufacturer instructions).

5. Wiring Inspection

• Step 1: Visually inspect the wiring harness under the dashboard for any signs of wear, fraying, or loose connections.
• Step 2: Repair or replace any damaged wires and ensure all connections are secure.