my Honda Accord 10th Generation (2018-2022) headlights flicker when I accelerate what’s going on

Solution

1. Preparation

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

2. Inspect Battery Connections

• Sub-steps:
  1. Disconnect the negative terminal of the battery.
  2. Clean any corrosion from the battery terminals using a wire brush.
  3. Reconnect the battery terminals securely.

3. Test Battery and Alternator

• Sub-steps:
  1. Reconnect the multimeter to the battery terminals (positive to positive, negative to negative).
  2. Measure the voltage at idle; it should be around 12.6 volts.
  3. Start the engine and measure the voltage again; it should be between 13.7 to 14.7 volts during acceleration.
  4. If the voltage does not increase, the alternator may be faulty.

4. Inspect Wiring and Connectors

• Sub-steps:
  1. Visually inspect the wiring harness connected to the headlights for frays or breaks.
  2. Check connectors for any signs of corrosion or poor contact.
  3. Repair or replace any damaged wiring or connectors as necessary.

5. Scan for Diagnostic Trouble Codes (DTCs)

• Sub-steps:
  1. Plug in the OBD-II scanner and turn on the ignition without starting the engine.
  2. Follow the scanner instructions to read any stored fault codes.
  3. Address any codes related to electrical issues or charging system faults.