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  #1  
Old 05-20-2018, 08:43 PM
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? Parasitic draw 03’ X5

I seem to have a current draw when truck is off.

Found that cabin fan turns on rradomly and softly for 3 to 5 secs. I also see a .1 v draw on my mm. After sitting in the front seat, when the fan turns on, I feel air on my feet.
Truck does go into sleep mode.

looked for info. No luck yet. FSU? Which fuse to check? TIA
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Old 05-20-2018, 10:55 PM
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Almost every time happens it's the final stage unit FSU also known as the final stage resistor FSR. It was the first repair I did on my wife's X5 it's very easy to get to from the right side of the transmission hump.


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Old 05-21-2018, 05:50 PM
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Thanks
Will order a new one and replace it, I just don’t get how the fan can run with truck turned right off....
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Old 05-21-2018, 06:59 PM
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Quote:
Originally Posted by andrewwynn View Post
Almost every time happens it's the final stage unit FSU also known as the final stage resistor FSR. It was the first repair I did on my wife's X5 it's very easy to get to from the right side of the transmission hump.


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It was the telematic unit in my case.
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Old 05-21-2018, 10:52 PM
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telematic?
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Old 05-21-2018, 11:22 PM
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Originally Posted by Pondhopper View Post
telematic?
It's the bluetooth module. If you have factory bluetooth you have a telematic control unit(TCU). One of several common culprits for parasitic drain. The common causes are the Nav/radio, the TCU and the FSR.
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Old 05-22-2018, 12:23 AM
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Hum... not sure that I have the Bluetooth setup. No map or any Nav system. I do have the tel buttons on the dash and steering wheel. It’s an 03 with sports package.

I looked at a fuse diagram and think fuses 7, 73 and 74 are related to the telematic (phone system?).

I’ll try pulling them tomorrow. Battery is now at 11.16 V and won’t start the engine. Dropped it to 10.5V after 2 tries.

Will charge again tomorrow AM and pull fuses to see.

Thanks for the feedback.
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Old 05-22-2018, 12:40 AM
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Thanks

Will order a new one and replace it, I just don’t get how the fan can run with truck turned right off....

A lot of parts on the X5 have power supplied all the time and they're operated by a pwm module that pulls to ground. When something goes haywire and that's switch doesn't open and stays closed whatever it's operates will stay on
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Old 05-22-2018, 04:16 AM
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Quote:
Originally Posted by Fifty150hs View Post
It's the bluetooth module. If you have factory bluetooth you have a telematic control unit(TCU). One of several common culprits for parasitic drain. The common causes are the Nav/radio, the TCU and the FSR.
Unlikely to be the telematic in this case - a faulty FSR can cause the fan to run - which is happening in this case. Can't see the telematic unit causing the fan to run.
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Old 05-22-2018, 12:06 PM
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Unlikely to be the telematic in this case - a faulty FSR can cause the fan to run - which is happening in this case. Can't see the telematic unit causing the fan to run.
True
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