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I do not know how this might relate to your situation but I would like to share my experience with a buzzing fuel injection relay.

I suddenly experienced a no start situation in a 240 (I believe it was a 1988). Along with the no start I was hearing a very loud buzzing from the fuel injection relay. Using a test light I found that I was getting the battery voltage on the relay socket. Jumpering the fuses to force the pumps to run allowed the car to start and run.

Someone here suggested that while I might have 12v being supplied I might not have the necessary amperage to close and hold the relay closed. To test that possibility I ran a wire directly from the battery to the correct connector on the socket. When I tried to start it with the bypass wire in place the car started and ran fine.

The 240 had an under hood inline fuse that was troublesome but this car had had that replaced and the fuse was clean and making good contact. As I looked further I found that the wire that lead from the battery to the fuel injection relay socket was swollen near the connector at the positive post.

When I disconnected the wire and cut back the insulation where it was swollen I found that it was heavily corroded and the corrosion was making its way up the wire under the insulation.

I cut off the connector and that portion of the wire that was corroded and soldered on a new connector. Problem solved. The corrosion was choking off the current flow but the 12v was still there and of course it had enough amperage to light a test light.

Is it possible you have the same situation in that the voltage is being delivered to the relay but the necessary amperage is absent?

Randy