Check that there is a reference supply of 5 V at pin 1.Check that there is a power supply of 12 V at pin 3.Check that there is earth at pin 6.Check that the sensor output voltage at pins 4 and 5 is between 0.3 and 4.7 V.Pin 1 - 5 Volt (reference power supply)Pin 2 - Test signalPin 3 - 12 V power supplyPin 4 - Yaw signalPin 5 - Lateral acceleration signalPin 6 - Earth