An electronic control system for a safety device of a motor vehicle includes a first sensor for a motion quantity, a computer for converting the motion quantity to a triggering signal for the safety device, and a second sensor for checking the plausibility of the sensor signal supplied by the first sensor. The two sensors are arranged with an identical construction and/or effect and at an at least approximately identical location on a printed circuit board such that, in a proper operating mode, their output signals have different preceding signs and are identical with respect to their amount over their entire operating range.