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Test the diode with a meter - if your meter has the diode test function -- a diode is a "one way check valve" for electricity, so will pass electric one way but not the other

Can you do a "buzz test" on the IDM ?
ForScan is my preferred tool for this test

That code is a communication fault to the IDM, so can be a bad IDM, fuse, harness, etc.
Running a buzz test will at least let you know if the IDM can function with commands from the PCM

Do you have power at the aux socket in the van (cig lighter) ?
 
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