my BMW X5 F15 (2014-2019) won't start, just clicks when I turn the key

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, wrench set
• Disconnect the negative battery terminal to ensure safety.

2. Battery Inspection and Replacement

1. Check Battery Health:
   • Use a multimeter to measure voltage; if below 12.4 volts, charge or replace the battery.
2. Clean Terminals:
   • Remove battery terminals (negative first), clean corrosion using a wire brush, and reconnect securely.
3. Replace Battery (if necessary):
   • Remove the battery hold-down clamp using a socket set.
   • Lift the battery out and replace it with a new one ensuring it meets OEM specifications.
   • Reconnect terminals (positive first).

3. Starter System Check

1. Inspect Starter Relay:
   • Locate and remove the starter relay from the fuse box.
   • Swap it with a similar relay and attempt to start the vehicle.
2. Test Starter Motor:
   • If the relay is functioning, check the starter motor connections for tightness.
   • If accessible, perform a direct test on the starter motor using jumper cables from the battery to the starter terminal. Ensure the vehicle is in neutral.
3. Check Wiring:
   • Inspect wiring to the starter for any signs of wear or damage.