它提出了一种用于检查的接口模块，它返回通过用数据消息，表示传感器值的第二数据帧到所述处理器接口模块存储的值的处理器以提示测试的方法。 这些固定的传感器值时，处理器可以检查接口模块的功能和它自己的算法。 安全模块还接收传感器值，也检查它的功能，使得当安全模块是一个冗余硬件路径到所述处理器（1）和作为用于约束的触发决定真实性检查装置使用。 该接口模块被放置在测试模式下时，它由所述处理器接收到第一数据报文，然后抑制从连接传感器接收到的实际的传感器值的传输。

Disclosed is a method for checking an interface module, which prompted a test returns by a processor with a data telegram to the interface module stored values, the sensor values ​​represent a second data telegram to the processor. With these fixed sensor values, the processor may check the function of the interface module and its own algorithm. A security block which also receives the sensor values, and checks its function so because the security module is a redundant hardware path to the processor (1) and is used as a plausibility check for the triggering decision of restraint devices. The interface module is put in a test mode when it receives the first data telegram from the processor and then suppresses the transmission of the real sensor values ​​received from connected sensors.