Help Please

Was thinking about this and have some ideas. We know there's a ground on the high speed fan circuit (CCRM pin #17) that shouldn't be there. Further we know that the CCRM stopped clicking when pin #17 was de-pin'ed. What if we take an old fashion test light (something that would load the circuit) put one side on battery positive. Put the other side on the body harness side of Pin #17? As long as the pin #17 is grounded the test light should light.

This will give us a way to monitor the circuit "live" in the manner in which it's used.

The first test to do is to verify that the test light goes out when the key is turned off. IF the test light does NOT go out that proves the line is still grounded.

IF the test light does go out, that implies the ground is coming from the PCM.

The next test should be to remove the PCM and see IF the test light goes out. Then ground the signal return at the PCM to confirm that the test light does indeed light up. This will prove the signal return line can carry a signal and we have the correct terminal at the PCM.

This test set up should also offer a solid method to "wiggle" test the wiring harness looking for faults.