Quote:
Originally Posted by synct
Thank you for all your responses.
Just to be clear: I tested the pos/neg on the harness leading to the fan. Voltage was 12V. Did NOT test the thin control signal wire. Read enough here to stay away from that. Got a brand new fan and plugged it into the harness. All 3 wires. Nothing. FSR, temp sensors, hoses just replaced (curiously this started shortly after.) Did that indy in Morris plains, NJ do it right? Some doubts.
What I don't know is what's coming out of the signal wire, and IF there's a signal to activate the fan. Upallnight, you make a good point about that. But already took it to the BMW dealer in Suffern who said I "need a new aux fan." RIGHT.
So, now to find an indy with diagnostic gear capable of testing the signal wire and more. This is a pretty pervasive problem. A lot of complaints, few solutions. Some replaced the Aux fan and that did it. Others never seemed. To find a solution.
I just want to use this resource to get some clues about what it might be to talk to a shop. Why reinvent the wheel?
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How did they determine this? Did they scan the X and a trouble came up that the fan was no good? On my X when I scanned the X it gave me a trouble code that the fan was bad. Confirmed this by checking the 50 amp fuse and it was blown.
At start up the DME will command the fan to turn on and turn off power to the fan and wait for the fan motor to send back a voltage through the signal wire back to the DME that then fan did turned on and is now producing a DC signal.
The IKHA module is also responsible for turning on the fan. If you have BMW scanning software you can verify this.