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#1
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Headlight or LCM Issue?
I've used a test light to check both sides. On the drivers side, I back probed the plug and the yellow wire carries voltage and the brown appears to be a ground. On the passenger side both the yellow and the brown seem to carry voltage. Is this a sign of a bad LCM, is there a relay somewhere or do I have to keep digging for a short?
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2001 E53 3.0i 2012 E70 xDrive35i |
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#2
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that is very odd. Do you have a Foxwell scanner? Your going to have to do some digging on this one. The Foxwell will allow you to operate each light independently. I would get a wiring diagram and see if you can trace it back and start a process of elimination. You can try another LCM. You will get the "tamper dot" on your odometer, but everything will work properly. If that isn't your problem, you plug your original back in and the tamper dot will go away. Welcome to BMW wiring hell!
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Dave S. Northeast 2003 4.6is 2005 E53 4.4 2003 E39 Msport(a REAL ONE!) 1959 Fiat 600 |
#3
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Are you reading voltage on both wires going to the bulb with the lights turned on and the bulb in place and is this reading in reference to ground ?? (neg test lead to vehicle ground)
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#4
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The brown wire is connected to chassis ground point (X166) so obviously there should be no voltage measured against ground.
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E39 530dA -02 M-Sport Messing metallic E53 X5 3.0dA -06 Sport Stratus grey |
#5
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Quote:
I have a set of aftermarket headlight assemblies installed. They came with a harness between the bulb and the OEM harness - basically just a plug with 2 wires and a bulb holder. I cut the ground on this harness and used a test lead to bypass the OEM harness to ground. The low beam works with this alternate ground. I do have a Foxwell NT530. I pulled the codes and the LCM has a 28 - LCM Light Control Module fault stored. I haven't tried to use the scanner to do anything else beyond pulling the codes so far.
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2001 E53 3.0i 2012 E70 xDrive35i |
#6
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Then you have a problem either with the connector or the ground that Clavurion is pointing out.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#7
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Is it common for the connector on the vehicle harness to go bad? The car's not here at the moment, but I'll take a close look when my son get's back from school. Maybe I can de-pin the connector and test again.
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2001 E53 3.0i 2012 E70 xDrive35i |
#8
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It would be against all odds that a ground wire would damage and short to damaged voltage wire (without blowing a fuse). Sounds more likely that there is something wrong with that after market adapter.
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E39 530dA -02 M-Sport Messing metallic E53 X5 3.0dA -06 Sport Stratus grey |
#9
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If the ground side of the lamp circuit is lifted (not connected to ground) then both the +ve line and the ground line will read a voltage - with no current through the lamp circuit, there is no voltage drop across the lamp, so the lifted ground line will read a similar voltage to the supply line.
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
#10
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Quote:
This a problem (clearly not meaning you) when people are saying they are measuring something and they don't understand the basics what they are measuring. (And also no pun intended. We are all doing the best we can.)
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E39 530dA -02 M-Sport Messing metallic E53 X5 3.0dA -06 Sport Stratus grey |
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