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Discussion of headlights, fog lights, blinkers, and any other car lighting.

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Old 10-24-2007, 03:06 PM   #1
bmw535i

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Your Ride: BMW M5 E39 BMW 635csi 1986 BMW M535i 1986 BMW 530d BMW 540i Touring BMW 730i BMW 325i E30 Cabrio
Lightbulb E39 High Beam Fault

My 1997 e39 535i has a constant power feed to the right hand side high beam bulb. Even with the key out the right hand bulb stays on. Is this controlled by an ECU or relay, and where would i find them.

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Old 10-24-2007, 03:53 PM   #2
witeshark
 
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Moved to lighting for better exposure
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Old 10-03-2008, 03:01 PM   #3
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Thumbs up E39 High Beam Issue

The problem you have is associated with the Lighting Control Module. On a right hand car the module can be found behind the kick panel on the lower right hand "A" Post. It might be in the same location on a left hand drive car. The High Power Switching FETS have failed and they are located on the PCB inside the lighting module. It will be very expensive to replace the module at approx 250 or US$500. Replacing the FETS is much cheaper and is a specialised job because the FETS are soldered onto the PCB, I have successfully repaired 2 cars with this fault.
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