my Honda Civic 10th Generation (2016-2021) battery light is on what should I do

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, wrench set, and safety glasses.
• Ensure the vehicle is parked on a level surface and the engine is off.

2. Inspect and Clean Battery Terminals

• Remove the negative (-) battery terminal first using a wrench to prevent short circuits.
• Clean the terminals and battery posts with a wire brush to remove corrosion.
• Reconnect the negative terminal and tighten securely.

3. Test and Replace Battery (if necessary)

• Using the multimeter, check battery voltage. If below 12.4 volts, consider replacement.
• To replace, remove the positive (+) terminal first, then the negative terminal.
• Remove any securing brackets and lift the battery out carefully.
• Install the new battery by reversing the steps: place the new battery in position, secure it with brackets, and connect the positive terminal first, then the negative.

4. Alternator Inspection and Replacement (if necessary)

• If the alternator output was low during testing, it may need replacing.
• Disconnect the battery again (negative terminal).
• Remove the serpentine belt by releasing tension from the tensioner.
• Unbolt the alternator from its mount and disconnect the electrical connectors.
• Install the new alternator by reversing the steps: connect electrical connectors, secure the alternator, and reattach the serpentine belt.

5. Final Checks

• Reconnect the battery and ensure all connections are secure.
• Start the vehicle and check for the battery light status.
• Monitor voltage output from the alternator again to confirm proper charging.