my Volvo XC90 battery dies when parked, what could be draining it?

Solution

1. Preparation

• Gather necessary tools and parts for the repair.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the negative battery terminal to prevent any electrical shock or short.

2. Battery and Connections Check

• Inspect Battery Condition: Check the battery for any signs of swelling, leakage, or damage. Replace if necessary.
• Clean Terminals: Use a wire brush to clean any corrosion from the battery terminals and cable ends to ensure a good connection.
• Reconnect Battery: Securely reconnect the negative battery terminal.

3. Identify and Repair Faulty Components

• Test Individual Components: Reconnect each component or accessory (e.g., alarm, infotainment) identified during the diagnostic steps. Monitor for current draw.
• Repair or Replace Malfunctioning Parts: Any component drawing excessive current must be repaired or replaced. Use original equipment manufacturer (OEM) parts when possible.

4. Parasitic Draw Test

• Conduct a Parasitic Draw Test: With the multimeter still connected in series, make sure the draw is within manufacturer specifications (typically less than 50 mA). If it exceeds, continue isolating circuits until the excess draw is found.

5. Final Checks

• After repairs, recheck all connections and ensure no tools or loose items are left in the engine bay.
• Reconnect the battery and perform a final voltage test to confirm the battery is holding charge.