09 Sonata Vent Solenoid Control Circuit Question

I want to confirm if the vent solenoid is bad. I disconnected the connector and read 12.6V and 4.3V from the two female terminals on the connector. 12.6 must be the power feed, why is there 4.3V on the control circuit? I plugged the connector back in, back probed the control circuit, and it read .1V I stopped testing because I was confused by the 4.3V reading. Could anyone explain that for me? Wiring diagram below.

"I plugged the connector back in, back probed the control circuit, and it read .1V "
Control circuit measured to ground should have 12v (vent normally open mode)
If 0v then suspect vent solenoid coil is open.
Verify ohm resistance of solenoid.

Coil resistance is 21.5 ohm.

I tried operating the solenoid with my test light when it was unplugged. I clipped the control side to a known good ground and applied power with my incandescent test light to the power side. The light turned on but I didn't hear any click from the solenoid.

Is there enough current in an incandescent test light to power the solenoid?

Thank you

Best to jumper 12v direct to solenoid.
Added resistance of your test light in circuit may be limiting current to solenoid coil.

Note: since the solenoid isn't electrically open you should have 12v on the control going to the PCM. If you read 0v then wiring or PCM is grounding voltage.