what to do if my BMW 3 Series E90/E91 won’t start and only clicks?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Battery Inspection

• Tools Required: Multimeter, wire brush or battery terminal cleaner.
• Clean the battery terminals with a wire brush to remove any corrosion.
• Reconnect the terminals securely and retest the battery voltage.

3. Starter Motor Testing

• Tools Required: Remote starter switch or jumper wire.
• Locate the starter motor, typically found near the transmission.
• Use the remote starter switch to apply voltage directly to the starter motor. If the starter engages and the engine cranks, replace the faulty ignition switch.

4. Replace Starter Motor (if necessary)

• Tools Required: Socket set, torque wrench, screwdriver.
• Disconnect the battery again before proceeding.
• Remove the starter motor by unscrewing the mounting bolts and disconnecting the electrical connectors.
• Install the new starter motor, ensuring the connections are secure and the mounting bolts are torqued to manufacturer specifications.
• Reconnect the battery and test the system.