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  #1  
Old 05-19-2020, 07:55 AM
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aux fan problem

Hi all
AC has not worked since i have owned the x5.

The aux fan does not spin.
I have unpluged the sensor on the AC pipe but still
no fan spin.
Checked the 50amp fuse and thats ok.
Found there is no 12 volts to the connector to the fan just 3.4v at the thin
signal wire.
I tried by putting 12 volts to the fan plug but nothing.

Thank you all in advance.

very hot dave king
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  #2  
Old 05-19-2020, 08:02 AM
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So did you check that continuous voltage from the fuse to fan? That thin wire is PWM signal from DME. You can activate it with diagnostics or PWM signal generator. Direct voltage on PWM wire won't work.
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Old 05-19-2020, 08:04 AM
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Quote:
Originally Posted by daveking View Post
Hi all
AC has not worked since i have owned the x5.

The aux fan does not spin.
I have unpluged the sensor on the AC pipe but still
no fan spin.
Checked the 50amp fuse and thats ok.
Found there is no 12 volts to the connector to the fan just 3.4v at the thin
signal wire.
I tried by putting 12 volts to the fan plug but nothing.

Thank you all in advance.

very hot dave king
That "Thin" wire provides what is known as a modulated pulse signal to the electronic in the fan. Get a scanner that can read BMW code and do a scan of the X5. A bad fan will show up in the DME module.
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Old 05-19-2020, 08:17 AM
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Hi
thanks for your reply.
I have read that the fan should
have a permenant 12 volts which
i don't have.
As i said fuse is fine.

thank you.

Dave king
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Old 05-19-2020, 08:42 AM
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Quote:
Originally Posted by daveking View Post
Hi
thanks for your reply.
I have read that the fan should
have a permenant 12 volts which
i don't have.
As i said fuse is fine.

thank you.

Dave king
Did you check all of the 50amps fuses? I believe one is a Spare and it doesn't provide power to any circuit.
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Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
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  #6  
Old 05-19-2020, 08:57 AM
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Hi
i got 14 volts both side of the big green fuses.
even removed the and checked for corrosion.

Thank you.
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  #7  
Old 05-19-2020, 09:02 AM
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Did you check the voltage on the 50 A fuse base? Can you give the specs of the vehicle.

Edit: You already answered the first one.
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Old 05-19-2020, 09:05 AM
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If the aux fan is bad or non functional it will throw a DME error. Check for errors in the DME...
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Old 05-19-2020, 09:13 AM
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Ok thank's for the reply's.

will fire up inpa later and let you know what i get.
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  #10  
Old 05-19-2020, 09:19 AM
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If you really don't have voltage on the thick red/blue wire on the fan connector diagnostics won't give us any more information. If we are talking about pre-facelift built before 9/2003 check the continuity/resistance on that supply wire between fuse F61 and fan connector.



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