my Volkswagen Golf MK7 (2015-2019) dashboard is flashing random lights

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface and the ignition is off.
• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Battery Inspection

• Tools Required: Wrench or socket set
• Clean the battery terminals using a wire brush if corrosion is present.
• Ensure the battery terminals are securely tightened.
• Reconnect the battery and check for any immediate changes in warning lights.

3. Fuse Inspection

• Tools Required: Fuse puller or needle-nose pliers
• Open the fuse box and visually inspect each fuse related to the dashboard and electrical systems.
• Replace any blown fuses with fuses of the same amperage rating.

4. Wiring and Connector Inspection

• Tools Required: Multimeter and basic hand tools
• Visually inspect wiring harnesses for fraying, cracking, or loose connections.
• Use a multimeter to check for continuity in critical circuits.
• Repair or replace any damaged wiring or connectors.

5. Alternator Test

• Tools Required: Multimeter
• Start the vehicle and measure the voltage at the battery terminals.
• The voltage should be between 13.8 to 14.2 volts.
• If the voltage is lower, replace the alternator.

6. Sensor Verification

• Tools Required: OBD-II scanner
• Clear any stored error codes after resolving electrical issues.
• Start the vehicle and monitor the dashboard for any warning lights reappearing.
• Confirm that all related sensors are functioning properly using the scanner.