my BMW 3 Series F30/F31 (2012-2019) won't start and just clicks

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the negative battery terminal to ensure safety.
• Tools required: Socket set, multimeter, OBD-II scanner.

2. Battery Inspection and Replacement

1. Inspect the battery:
   • Check for any visible damage or leaks.
   • Clean terminals with a wire brush if corrosion is present.
2. Test battery voltage:
   • If voltage is below 12.4 volts, charge or replace the battery.
   • If replacing, ensure to use a compatible battery (e.g., AGM type).
3. Reconnect the battery and attempt to start the vehicle.

3. Starter Motor Inspection

1. Remove the starter motor:
   • Locate the starter, typically near the transmission.
   • Disconnect the wiring harness and remove the mounting bolts.
2. Test the starter:
   • Use a multimeter to check for continuity and proper operation.
   • If defective, replace the starter with a new or remanufactured unit.
3. Reinstall the starter motor and ensure all connections are secure.

4. Ignition System Check

1. Inspect the ignition switch:
   • Remove the steering column cover to access the ignition switch.
   • Check for wear or internal damage.
   • Replace if necessary.
2. Test all related fuses:
   • Locate the fuse box and inspect for any blown fuses related to the starting circuit.
   • Replace any blown fuses and retest the starting system.