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Try to hot wire 30, 87b, and 87, not only 30 and 87b as you first did. You should then be able to crank and start the engine. If it does not start, then the fuel pump is indeed a possible culprit. When doing so, you should hear the pump buzz before you crank the engine. If no buzz, then the pump is likely failing.
But there is one last check you can try to make sure all parts of the DME relay are ok. Your previous tests showed that the main internal relay is correct (the ECU is powered on and the ICV is vibrating). The voltages measured on pin 85b when ignition key was on Run (12V), then Start (1.5V) seem both correct. Like you said, the second 1.5V value shows that the ECU is pulling a ground on 85b when key is in Start position. That means the second internal relay coil of the DME relay is energized correctly. But its contacts could still be bad, in which case the fuel pump would not get power.
So if you can manage to insert a wire in pin 87b of the relay like you did for 85b, check to see if a +12V is present on this pin when the relay is in place and when key is in Start. That way you will know that the DME relay is good and the fuel pump is probably bad.
If you can get a hand on the Bentley manual, see a simplified diagram on page 240-37. Very useful.
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