my BMW 3 Series E90/E91 (2005-2012) won't start and just clicks what should I do

Solution

1. Preparation

• Tools Required:
  • Multimeter
  • Load tester
  • Wrench set
  • Screwdrivers
• Disconnect the negative terminal of the battery to ensure safety while working on the electrical system.

2. Battery Replacement (if necessary)

• Sub-steps:
  1. Remove the battery hold-down bracket using a socket wrench.
  2. Carefully lift the old battery out of the tray.
  3. Place the new battery in the tray, ensuring the terminals are positioned correctly.
  4. Reattach the hold-down bracket and secure it tightly.
  5. Connect the positive terminal first, followed by the negative terminal.

3. Starter Motor Inspection

• Sub-steps:
  1. Locate the starter motor (generally mounted on the engine block near the transmission).
  2. Disconnect the electrical connector from the starter motor.
  3. Use a wrench to remove the bolts securing the starter motor.
  4. Carefully remove the starter motor and inspect it for signs of damage or wear.
  5. If the starter is faulty, replace it with a new or refurbished unit.

4. Testing and Reinstallation

• Sub-steps:
  1. Reinstall the starter motor and secure it with bolts, tightening to the manufacturer’s specifications.
  2. Reconnect the electrical connector to the starter motor.
  3. Reconnect the negative terminal of the battery.
  4. Attempt to start the vehicle and observe for any clicking sounds.