Input impedance of the BT-WF module?

[ZhenyaKa]

Please advise, what should the input impedance of the Bluetooth-WiFi module be? The 1.8V voltage regulator has died ? there is 5V at the input, but 0V at the output. However, the input impedance of the BT-WF module is less than 5 ohms. I suspect that it has departed to the other world and taken the voltage regulator with it.

BT-WF module: AW-GM381-2-12040-0BH