At the risk of only adding confusion and not being there, I don't know what else to say. I have seen ECMs have problems which included not self reading codes on the light. Try a code reader, if that doesn't work, check all the fuses, if they are all good try to borrow a scan tool.. if not available, you might take it and pay for a diagnosis, and maybe, a repair. Post what you find.. fixes are always interesting.i get cluster self test buy holding the button and turning key on just once. one and off 3 or 5 times did not read anything. just goes to normal mileage reading. 141K if anyone wants to know