What is the method to check if the turn signals, headlights, reflector lights, brake lights, and reverse lights are working?

The correct method to check if the turn signals, headlights, reflector lights, brake lights, and reverse lights are working effectively is to perform a manual light check. This involves physically inspecting each light while the vehicle is stationary. This process typically includes asking someone to assist by activating the lights or using reflections in a nearby surface to observe their functioning.

Relying solely on dashboard indicator lights may not provide a comprehensive check, as these indicators primarily indicate the operational status of selected lights but may not confirm they are working correctly as viewed from outside the vehicle. Observing lights in a rearview mirror may not allow for a clear view of all lights, especially those that are located on different planes or sides of the vehicle. Pressing both turn signals simultaneously is not a reliable method for checking their functionality, as it does not provide a means to verify the specific operation of each signal independently.

Therefore, a thorough manual light check ensures that all lights are not only on but are functioning correctly and are visible to other road users.