Dodge Repair: Computer code, dodge ram 1500, drb iii

Question
I have a 2000 dodge ram 1500, V6, Automatic. The problem is when you turn vehicle on check engine light,ABS,Airbag,and fuel l;ights all come on. No reading on gauges and in the odometer display is No bu5. When we held trip meter and turned on ignition the computer ran a check and spit out codes: 900,920,921,940,950,999. What is this and what can we do to correct? Thank You.

Answer
Your truck has several modules that all communicate
over a network called a ccd bus.
There is not much you can do at home except to check
the IOD fuse.
Other than that, a DRB III is required to diagnose the
bus failure.

(you might also want to check the connections at the rear
of the instrument panel)