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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 05-05-2011, 07:11 AM
eagledrver eagledrver is offline
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Location: california
 
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Mein Auto: 528i
Cool rear window defroster

just purchased a 99 528i, when I enable the rear window defroster, the radio has a lot of static. Any ideas
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  #2  
Old 05-05-2011, 01:23 PM
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microswitch microswitch is offline
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Location: Los Angeles
 
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Mein Auto: 2006 5251
Well the antenna in your model is located on the rear windshield just above the defrost elements.
I assume some bad connection.....
you will need to remove the trimming around the windows to access the connection
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  #3  
Old 05-05-2011, 02:03 PM
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QSilver7 QSilver7 is offline
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Mein Auto: 1997 740iL / 2006 X5 4.4
Or it could be simply be the wires that are running to the rear windshield have dropped or are too close to one another and is causing the static.

Drop open the cover on the left side of the trunk and look for the bundle of wires that work their way to the rear windshield (that are also associated with the antenna in the rear window). Manipulating these bundles (while the radio is on) may reveal which wires are too close to each other.

You can see the antenna wiring (#5 in diagram below) that runs from the amps in the C-pillar: http://www.realoem.com/bmw/showparts...58&hg=65&fg=30





(this illustration shows the e38's IHKA control panel...but the e39's IHKA panel is wired up basically the same way)
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Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
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99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

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Last edited by QSilver7; 05-05-2011 at 02:06 PM.
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  #4  
Old 10-12-2012, 07:58 AM
JCBAGNELL JCBAGNELL is offline
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Location: Massachusetts USA
 
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Mein Auto: 1998 528i
I have the same issue, but the defroster also only works with a couple of the lines in the window, did you ever resolve this?
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  #5  
Old 01-25-2013, 05:48 AM
bsell bsell is offline
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Mein Auto: 1998 535 COSMOSSCHWARZ ME
Most clear schematic I've seen...

Quote:
Originally Posted by QSilver7 View Post
Or it could be simply be the wires that are running to the rear windshield have dropped or are too close to one another and is causing the static.

Drop open the cover on the left side of the trunk and look for the bundle of wires that work their way to the rear windshield (that are also associated with the antenna in the rear window). Manipulating these bundles (while the radio is on) may reveal which wires are too close to each other.

You can see the antenna wiring (#5 in diagram below) that runs from the amps in the C-pillar: http://www.realoem.com/bmw/showparts...58&hg=65&fg=30





(this illustration shows the e38's IHKA control panel...but the e39's IHKA panel is wired up basically the same way)
So my radio reception is good but I have no rear defrost...yet the side mirrors defrost just fine.

Took the C pillar covers off to find I have neither power or ground (via test light) to the heating elements and the ground into the driver's side module is good but no ground to the grid.

So are both controllers most likely shot? Edit, saw on another post that you have 10 minutes to verify power before it stops applying juice (to prevent overheating) and the rear defroster turns off when system voltage falls below 12.2V. I did see a brief flash on the power side, then checked system voltage and found it at 12V, even with the battery charger assisting. (Left this info for others' use in the future.)

Quit being a baby (it's below freezing today) and opened the garage, started the car and viola, power to the grid but no ground to the grid.

Took apart the FM amplifier to find the solder blown off the ground lead where it joins the PCB. A couple minutes finding the soldering iron, applying heat & new solder and now there is ground to the grid. I just hope the original solder job was weak from the factory, otherwise the next time it might burn up the PCB...

This is a 1998 (Feb build) Euro 535IA.

Brian

Last edited by bsell; 01-25-2013 at 07:12 AM.
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  #6  
Old 01-25-2013, 06:30 AM
JCBAGNELL JCBAGNELL is offline
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Location: Massachusetts USA
 
Join Date: Oct 2012
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Mein Auto: 1998 528i
Reolved

Even though there was no visible damage to the defroster or antenna lines on my rear window, a new window resolved the problem.
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