Your car has no relay..
The regulator is a Switching Transistor/voltage regulated circuit , so of course it has no moving parts ..they burn up or short inside.

The yellow wire is trigger voltage from the Control Panel to trigger the switching transistor on the ground side of the blower circuit..so, if you just ground the blu wire like I asked, you will see that that ELIMINATES the regulator out of the blower circuit for a DIAGNOSTIC TEST. That is what the reg does ..it GROUNDS the neg side of the blower motor..it is a SWITCHED GROUND circuit.
SOOOOO, this is what we do ....I give you the sequenced test procedures and you do them and report the findings..I then tell you the next test and we will finally get to the solution/remedy.

The first test was.... do you have 12v at the red wire at the blower ...so, when you have time , that is where the diagnosis starts and then go to the second test I posted for you [ ground the blu wire] ...

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A Dalton