no communication
 

I have a 2000 s4 first off the abs light, engine light, and air bag light are all on, and the radio does not work it has no power gotta check the fuse in back of radio, but a friend has vag com we tried to connect to my car and check what the faults are so i can take care of them. when we hook up to the daig plug there is no communication, he ran a diag on the obd2 connector and it said that it is shorted to ground. now could the shorted to ground be from the other lights being on or is it the connector itself and i should start there. all fuses are fine i checked them. if anybody has any input it would be appreciated thanks.