E Box Fan Control
The E Box fan is controlled by the MS S52. The control module contains an integral NTC temperature sensor for the purpose of monitoring the E Box temperature and activating the fan.
When the temperature of the E Box exceeds predetermined values, MS S52 provides a switched ground for the E Box fan to cool the E Box located control modules.
With every engine start-up, MS S52 briefly activates the fan ensuring continued fan motor operation for the service life of the vehicle. This feature is intended to prevent fan motor "lock up" from lack of use.