my BMW 5 Series F10/F11 (2010-2017) won't start but the lights are on

Solution

1. Preparation

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

Tools Required:

• Multimeter
• Socket set
• Screwdriver set
• Jumper cables

2. Inspect and Clean Battery Connections

1. Remove the positive (+) and negative (-) battery terminals using a socket wrench.
2. Inspect the battery terminals for corrosion; clean them with a wire brush and a mixture of baking soda and water if necessary.
3. Reattach the battery terminals securely, ensuring a snug fit.

3. Jump Start the Vehicle

1. Position a working vehicle close enough for jumper cables to reach.
2. Connect the jumper cables: positive to positive and negative to negative.
3. Start the working vehicle and let it run for a few minutes, then attempt to start the BMW.

4. Check the Starter Motor

1. Locate the starter motor (usually found near the transmission bell housing).
2. Inspect the wiring and connections for any visible damage.
3. If necessary, remove the starter motor for bench testing or replacement.

5. Replace the Battery (if needed)

1. If the battery voltage is below 12.6 volts after cleaning, proceed to replace it.
2. Remove the old battery, ensuring to disconnect the negative terminal first.
3. Install the new battery, connecting the positive terminal first, followed by the negative terminal.
4. Tighten all connections securely.