Cooling Fan Fault

[upallnight]

Notice the last time that I scanned my X with Carsoft 6.5 and BMW Scanner 1.4 I received a fault for a Cooling Fan. Had some time today to investigate it a little more.

Try forcing the fan on by turning on the AC. The AC Compressor never engaged so I took out my AC gauge and connected it to the low and high side ports. The static pressure was 45 psi on both the low side and high side (Compressor not running) so there was refrigerant in the system and enough to turn off the low side of the pressure switch.

Took out the laptop and ran BMW Scanner again to check the HVAC for any trouble code none was found, engage the ac switch and that was highlighted in the program, but the compressor did not engage.

So I'm wondering if the DME is not sending a signal to engage the compressor because of the Cooling Fan fault that is in the DME. Try clearing the fault but it keeps coming back. The fan spin so it is not seized.

Haven't bench tested the fan, but my understanding is that the DME send a grounding frequency signal to the fan which cause the fan to spin and at a speed determine by the frequency. No relay is use in turning this fan on. It has two thick wire which I assume is the + and - wires and a thin wire which is the signal wire.

Anyone have this problem before? Solution?