The signaling device lights up at turn of the switch of ignition in the provision of "ON" (ignition is included) and dies away after launch of the engine.

The signaling device lights up at failure of the steering hydraulic booster. If the signaling device joined, kill the engine and start it again.

If the signaling device does not light up after repeated launch of the engine any more, then it demonstrates maintenance of the steering hydraulic booster. If the signaling device continues to burn, then the steering hydraulic booster is faulty.

NOTE If the malfunction signaling device burns, then the steering hydraulic booster does not work. At the same time driving is, still, possible. However, rotation of a steering wheel from the driver requires more physical efforts.