1. It means that the handbrake is operated and should be released, because it activates the brakes.
  2. It means that the handbrake is not operated and should be activated.
  3. It means that the handbrake is ok. The light indicator is malfunctioning and should be replaced.
  4. Everything is ok. It is a check light that should be on for as long as the handbrake is properly functioning.