Hello,
It sounds like you have a fan control module that is out which is part of the cooling fans, here is the radiator fan wiring diagrams so you van see how the system works.
ENGINE CONTROL COMPONENTS
Cooling Fan Control
The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C ON/OFF status, A/C pressure) to determine engine cooling fan needs.
For variable speed electric fan(s):
The PCM controls the fan speed and operation using a duty cycle output on the fan control variable (FCV) circuit. The fan controller (located at or integral to the engine cooling fan assembly) receives the FCV command and operates the cooling fan at the speed requested (by varying the power applied to the fan motor).
The fan controller has the capability to detect certain failure modes within the fan motors. Under certain failure modes, such as a motor that is drawing excessive current, the fan controller shuts OFF the fans. Fan motor concerns may not set a specific DTC. With the fan motor disconnected from the fan controller, voltage may not be present at the fan controller.
Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Saturday, March 19th, 2011 AT 6:45 PM