2007 Town Car Radiator Fan Signal to operate control module??

Hally

Registered
Recently the cooling fan in front of the radiator seems not to operate. Does anyone know what kind of signal comes out of the PCM to activate the fan control module? According to the book it is a variable signal which causes the fan to run at certain speeds, etc. Would I be able to see this signal on an analog voltmeter? Or, is a scope necessary to watch for pulses at a certain frequency? The local dealer says that the fan motor itself caused the fan control module to fail so now both fan and control module needs to be replaced at a cost of $1350. Sounds kind of bogus to me. The fan will run when hot wired to a 12VDC source. I've checked all the fuses etc associated with this fan and all are good. And voltage is present at the connector going into the fan control module. Thanks for any help or comments.
 
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