SCANIA электросхема реле уровня охлаждающей жидкости

R512, Relay for coolant 
level
Function
Located at relay point 34 in the central electric 
unit.
Monitor T503 is earthed via the coolant.
When coolant level is too low, monitor T503 
loses its earth which causes R512 to earth the 
buzzer and warning lamp in the instrument 
cluster via pin «L» and «-«.

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