my BMW 5 Series won't start and makes a clicking noise, what should I check

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure vehicle is in a safe location with sufficient space to work.
• Disconnect the battery's negative terminal to prevent electrical shorts.

2. Battery Inspection and Replacement

• Sub-step 1: Clean the battery terminals using a wire brush and a mixture of baking soda and water to remove corrosion.
• Sub-step 2: Tighten any loose battery connections securely.
• Sub-step 3: If battery voltage is below 12.4 volts, charge the battery using a battery charger.
• Sub-step 4: If the battery is faulty (e.g., below 12 volts after charging), replace it with a new battery of the same specifications.

3. Starter Motor Inspection and Replacement

• Sub-step 1: Reconnect the battery’s negative terminal.
• Sub-step 2: Locate the starter motor (typically near the transmission bell housing).
• Sub-step 3: Remove the electrical connections to the starter, noting their positions.
• Sub-step 4: Unbolt the starter motor from its mount (usually two or three bolts).
• Sub-step 5: Replace the starter motor with a new unit, ensuring proper alignment.
• Sub-step 6: Reconnect electrical connections and secure all bolts to the manufacturer’s torque specifications.

4. Final Checks

• Sub-step 1: Reconnect the battery’s negative terminal.
• Sub-step 2: Perform a final inspection of all connections and components for security and cleanliness.
• Sub-step 3: Start the engine to confirm the issue has been resolved.