Rear

1. Disconnect the air line at the air compressor drier that is connected to rear fill solenoid inlet.
2. Disconnect the air lines at the rear LH and RH air spring solenoids.
3. Connect NGS to the vehicle.
4. Turn the 4WAS-REAR_FILL (rear fill solenoid) solenoid ON.
5. Connect shop air line to the disconnected air line and blow out any fluid.
6. Reconnect the air line at the rear LH and RH air spring solenoids.
7. Replace air compressor drier.
8. Reconnect the air line to the air compressor drier.