my BMW X5 G05 (2019-2024) won't start, what are the possible causes?

Solution

1. Preparation

• Gather tools: multimeter, OBD-II scanner, socket set, wrench set.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Battery Inspection and Replacement

• Inspect the battery condition:
  1. Remove the battery terminals (negative first, then positive).
  2. Clean any corrosion from the terminals and battery posts.
  3. Test the battery with a multimeter. If voltage is below 12.4 volts, replace the battery.

3. Starter Motor Testing and Replacement

• Test the starter motor:
  1. Reconnect the battery terminals.
  2. Use a multimeter to check voltage at the starter while attempting to start the vehicle.
  3. If there is no voltage, trace wiring back to the ignition switch.
  4. If voltage is present but the starter does not engage, remove the starter motor.
     • Unscrew the mounting bolts.
     • Disconnect the electrical connections.
  5. Install the new starter motor, ensuring it is securely mounted and connections are tight.

4. Ignition Switch and Key Fob Check

• Inspect the ignition switch:
  1. Remove the steering column cover to access the ignition switch.
  2. Test for continuity with a multimeter when the key is turned.
  3. Replace the ignition switch if it shows no continuity.
• Check the key fob battery:
  1. Open the key fob and replace the battery if necessary.