Activation/Deactivation of heater in the EAC unit

This function is used to activate or deactivate the heater in the EAC unit.
Test conditions:
Procedure:
  1. Start the function.
  2. Check test conditions.
  3. Check current status.
  4. Select how the parameters are to be modified.
  5. When requested, turn off the ignition and press "OK" to continue.
  6. When requested, turn on the ignition and press "OK" to continue.
  7. Check the status after modification.
  8. The function is done.