my BMW 3 Series G20/G21 (2019-2024) won’t start and just clicks, what should I do?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.

2. Battery Inspection and Replacement

• Tools Required: Multimeter, wrench set, battery terminal cleaner
• Sub-steps:
  1. Disconnect the negative (-) battery terminal first, followed by the positive (+) terminal.
  2. Inspect the battery for any signs of physical damage or leakage.
  3. Clean the battery terminals using a terminal cleaner; ensure they are free of corrosion.
  4. If the battery voltage is below 12.4 volts, replace the battery with a new one of the same specifications.

3. Starter Motor Test and Replacement

• Tools Required: Socket set, torque wrench, remote starter switch
• Sub-steps:
  1. Locate the starter motor (usually found below and behind the engine).
  2. Disconnect the battery again if it was reconnected.
  3. Remove the electrical connections from the starter motor.
  4. Remove the mounting bolts securing the starter motor and take it out.
  5. Test the starter motor with a remote starter switch to see if it engages.
  6. If the starter does not engage, replace it with a new starter motor, ensuring all connections are secure and bolts are torqued to manufacturer specifications.

4. Verify All Connections

• Tools Required: Wrench set
• Sub-steps:
  1. Reconnect the battery terminals, starting with the positive (+) terminal.
  2. Ensure all connections related to the starter and battery are tight and free from corrosion.
  3. Recheck fuses related to the starting system and replace any that are blown.