Volkswagen Golf Seventh Generation (2013-2020) battery drains overnight why is that happening

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, battery terminal cleaner, safety gloves, and eye protection.
• Safety Warnings: Disconnect the negative battery terminal before beginning any electrical work.

2. Battery Inspection and Testing

• Sub-step 1: Remove the negative battery terminal using a socket set.
• Sub-step 2: Clean the battery terminals with a battery terminal cleaner to remove any corrosion.
• Sub-step 3: Test the battery voltage with a multimeter; replace the battery if it does not hold a charge above 12.4V.

3. Parasitic Draw Test

• Sub-step 1: With the negative terminal still disconnected, connect the multimeter in series to measure the current draw.
• Sub-step 2: Wait for the vehicle's systems to go to sleep (typically 30 minutes) and then check the reading.
• Sub-step 3: If the draw is above 50 mA, start removing fuses one at a time to pinpoint the circuit causing the drain.

4. Component Inspection

• Sub-step 1: Inspect each circuit identified in the previous step for any faulty components (e.g., lights, modules).
• Sub-step 2: Repair or replace any faulty components identified during the inspection.

5. Reassembly

• Sub-step 1: Reconnect the negative battery terminal securely.
• Sub-step 2: Start the vehicle and monitor for any electrical issues.