Service board for car heating

摘要

A service board contains a front plate (1) whose front side is covered with a thin foil (2) and at least one push button (18) mounted on the plate which can be pushed in under thumb pressure and return elastically to its starting position. The button(s) is/are connected to a switch organ so that with each press, the state of a current circuit is changed. Each push button contains a region of the foil, a light distribution element (12) which covers the back of this region and is suitable for distributing the light emitted from a bulb, and a bistable relay with two positions, a stable and an unstable one. The relay is tensioned between the light distribution element and the front plate so that is changes over from stable to unstable positions while working on the switch organ, when the light distribution element is pushed in to the front plate. This element and the relay are contained in a pocket which is formed by the foil at the front and a protective foil behind going round the push button.