Abstract: A remote engine start system, comprising an engine start unit and a control unit is disclosed. The engine start unit is arranged in a vehicle and configured to receive signals from a remote control. The vehicle comprises a drive motor. The engine start unit is configured to initiate the start of the drive motor upon receipt of a signal from the remote control. The control unit is configured to monitor the function of the engine start unit, and to detect errors in the function of the engine start unit. The remote engine start system is configured to prevent the starting of the drive motor once an error in the function of the engine start unit was detected, and to initiate the turning off of the drive motor, if the drive motor is turned on and an error in the function of the engine start unit was detected.

Abstract: A remote engine start system, comprising an engine start unit and a control unit is disclosed. The engine start unit is arranged in a vehicle and configured to receive signals from a remote control. The vehicle comprises a drive motor. The engine start unit is configured to initiate the start of the drive motor upon receipt of a signal from the remote control. The control unit is configured to monitor the function of the engine start unit, and to detect errors in the function of the engine start unit. The remote engine start system is configured to prevent the starting of the drive motor once an error in the function of the engine start unit was detected, and to initiate the turning off of the drive motor, if the drive motor is turned on and an error in the function of the engine start unit was detected.

Abstract: A control circuit between a control port of a microprocessor and an actuator has a control stage whose terminal connection is connected to an actuator terminal and whose control connection is connected to the control port of the microprocessor. In normal operation, the control port is switched as an input and, depending on the terminal voltage, the control stage outputs a control signal which is amplified in a driver stage. By switching the control port as an output and applying a low level to the control connection, the control stage can be inhibited in special cases, such as when the supply voltage dips below a given threshold.