diff --git a/Train.cpp b/Train.cpp
index 2dfdf5d8..c7264d56 100644
--- a/Train.cpp
+++ b/Train.cpp
@@ -7388,10 +7388,10 @@ bool TTrain::Update( double const Deltatime )
 		btCabActived.Turn(false);
     }
 
-    if (mvControlled->Battery && mvControlled->CabActive == 0)
+    if (mvControlled->Battery && mvControlled->CabActive != 0)
 		btAKLVents.Turn(true);
 	else
-		btAKLVents.Turn(true);
+		btAKLVents.Turn(false);
 
     if( true == lowvoltagepower ) {
         // McZapkie-141102: SHP i czuwak, TODO: sygnalizacja kabinowa