Turn the circuit breaker back on, turn on the air, and power up the machine.
Once the machine has turned on, ensure that the cable is properly connected by gently touching the sensor. If the sensor beeps, the cable is correctly wired and connected. If the sensor does not beep, check that the cable end is connected into the correct connector.
Once it is confirmed that the sensor is properly connected, reattach the contact cover  and ensure the velcro straps are reaffixed to hold the sensor cable.
Lastly, slide the schematic panel  back onto the side of the machine.