I looked carefully at the schematic. The ECM connection is the check engine light and has nothing to do with the function.
The last thing it might be are the cluster grounds. You need to get a digital voltmeter ($20.00) and check for a ground on all the black wires.
12 Volts powers the cluster and is on the black and yellow wire from fuse 14. There should be 2/3 inputs. The internal cluster voltage is 7 volts.
A digital voltmeter is your only choice.
Let me know
Friday, May 12th, 2006 AT 5:25 PM