2001 blower motor inop

[90turbo1]

So I have been working off and on with my kids x5, he gave up on it and parked it last fall due to no heat cause no blower.

We replaced the blower motor (removed dash and such) replaced final stage (fcp euro) works good in another x5 just to test it.

here is the problem.

when you turn the heat or ac on there is no main fan. the fan in the center console works that blows out rear of center console.

I have battery voltage at the large wire going into the final stage, the brown wire shows good ground.

the red and green and black and green wires got to the new motor.

the small wire shows no voltage no matter what the climate control is set to.

I used a power probe and put voltage to new fan and nothing. I do not have much faith in this new fan as it was a cheap ebay fan the kid bought.

my question is, I have no voltage at the small wire to activate the FSU and thus the Fan. What should I see there?

Also the IHKA head unit seems to power the center console FSU and fan which works just fine. All the wiring diagrams I find are for blower control without rear compartment blower.

I am thinking the IHKA is faulty, and now after sitting for a winter the fan may also be.

any help here.

thanks