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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 03-29-2014, 11:25 PM
betaruce betaruce is offline
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circuit from dsc module to wheel sensor

May i ask how can we check the connection between the dsc module and wheel sensors?
I hv a right rear wheel sensor code which persist despite sensor replaced and bearing checked.
My car is a 06 e90 335 eur rhd
Thanks
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  #2  
Old 03-30-2014, 06:12 AM
roadkillrob roadkillrob is offline
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Some info here may help - this is a pretty comprehensive thread from the E39 forum about how it all works

http://www.bimmerfest.com/forums/sho...d.php?t=356272

Buried in that thread is this post which has the pin numbers for the wheel sensors to test (appears to be from the Bentley manual, so you might want to pick one of those up for their instructions on testing)

http://www.bimmerfest.com/forums/sho...90#post5445934
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  #3  
Old 03-30-2014, 06:32 AM
fdriller9 fdriller9 is online now
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I think you can take an ohm meter and connect it to the wires coming from the DSC module. (Disconnect the sensor and measure there)

It should zero out if the wires are good
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  #4  
Old 03-31-2014, 04:08 AM
betaruce betaruce is offline
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thanks for the links. very useful. i have also double checked with the wire diagrams from bmw planet.

just have a look at the female side connector of my car
seems that some of the pins for sensor are not metal but just covered in white? how am I suppose to test those pin?

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  #5  
Old 03-31-2014, 05:24 AM
CitizenOfDreams CitizenOfDreams is offline
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The white ones are just blank positions, no pins. If you think they should be there, you are either looking at a wrong diagram (different car, different year, different options) or you are not counting the pins right.
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  #6  
Old 03-31-2014, 05:37 AM
betaruce betaruce is offline
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Quote:
Originally Posted by CitizenOfDreams View Post
The white ones are just blank positions, no pins. If you think they should be there, you are either looking at a wrong diagram (different car, different year, different options) or you are not counting the pins right.
I am just checking it from bmw planet wire diagrams
it does not mention about the exact year or model, just E9x series
and it also match with the link posted above

may I ask where I can search for the wire diagram of the exact bmw?
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  #7  
Old 03-31-2014, 06:24 AM
betaruce betaruce is offline
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ok i found out the problem
previously i choose the diagram under "DSC Borsh"
But then I found that my car is probably "Without DSC Borsh", under which contains different diagram according to year

anyway
may I ask how often does the wire from the module to the speed sensor gets fail? I cannot find a post about checking or replacing or the location of this wire....

Last edited by betaruce; 03-31-2014 at 06:25 AM.
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  #8  
Old 03-31-2014, 07:06 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by betaruce View Post
May i ask how can we check the connection between the dsc module and wheel sensors?
I hv a right rear wheel sensor code which persist despite sensor replaced and bearing checked.
My car is a 06 e90 335 eur rhd
Thanks

Get thee to an O Scope! Or INPA cable....

Check posts #3 & #5 HERE

The sensor is simply picking up a magnetic strip on the bearing or associated part as it rotates. Hall effect sensors output a square wave. However....if magnetic strip's damaged or spaced away, won't work! Food for thought.


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Old 03-31-2014, 07:42 AM
CitizenOfDreams CitizenOfDreams is offline
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Are E90's wheel sensors Hall effect or pickup coils?
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  #10  
Old 03-31-2014, 08:19 AM
fdriller9 fdriller9 is online now
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Pretty sure they are hall effect. I want to say the pickups are in the wheel bearing itself.....but can't remember off the top of my head.
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  #11  
Old 04-01-2014, 03:38 AM
betaruce betaruce is offline
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Quote:
Originally Posted by CALWATERBOY View Post
Get thee to an O Scope! Or INPA cable....

Check posts #3 & #5 HERE

The sensor is simply picking up a magnetic strip on the bearing or associated part as it rotates. Hall effect sensors output a square wave. However....if magnetic strip's damaged or spaced away, won't work! Food for thought.



i already hv sensor replaced but still lights on
inpa code is 5dc2
so need to check if the wires from module to sensor is ok or not
does anyone know where this wire locate?
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  #12  
Old 04-01-2014, 04:11 AM
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Quote:
Originally Posted by betaruce View Post
i already hv sensor replaced but still lights on
inpa code is 5dc2
so need to check if the wires from module to sensor is ok or not
does anyone know where this wire locate?

Well, check voltage on wires at sensor.

Bad? Problem's upstream - check wiring.

Good? Check wires at sensor with oscilloscope while turning wheel.
Square wave? Problem's downstream.

No square wave? Problem's at sensor - possibly the magnetic strip's an issue.

You can take it from there. FYI HERE is an interesting thread - yes I know, wrong year & model, but fundamentals apply.
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Old 04-01-2014, 04:13 AM
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Did dealer replace sensor? Maybe code was not cleared. Performance issue?
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  #14  
Old 04-01-2014, 06:30 AM
betaruce betaruce is offline
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sensor already replaced but still the same error code 5dc2 right rear sensor

so remaining possibility include:
-still a faulty sensor despite its a new one (should be differentiate by left right swapping)
-faulty wiring from module to sensor (so I am asking where actually the wire locates)
-bearing (but garage claim that he has switched left right but still the same error)

module/pump unit failure?
from what I read, pump is the common failure unit (not the module), with the code 5df0 5df1
i didn't come across a post that a sensor code turn out to be this unit failure in E90

any suggestion would be greatly appreciated

Last edited by betaruce; 04-01-2014 at 06:32 AM.
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  #15  
Old 04-01-2014, 06:50 AM
fdriller9 fdriller9 is online now
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Did you try measuring the resistance of the wires, at the connector where the sensor plugs in?

Like I said, I think they will zero out on the ohm meter.

Or you can try measuring voltage and see if there is either 5v or 12v there.

I don't know why you want to chase the wires back to the module.
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Last edited by fdriller9; 04-01-2014 at 06:52 AM.
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  #16  
Old 04-01-2014, 07:09 AM
betaruce betaruce is offline
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i guess it is the same? to measure resistance from the female connector side at the module under the hood, as suggested by the famous post by bluebee for E39

http://www.bimmerfest.com/forums/sho...1&postcount=48

i am going to try that in these days

however, the error actually appears intermittent (when checking real time data from speed sensor with INPA, the right rear do fluctuate every now on then), I hope I can still find something in the resistance test by diode meter.....
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  #17  
Old 04-01-2014, 07:58 AM
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Quote:
Originally Posted by fdriller9 View Post
Did you try measuring the resistance of the wires, at the connector where the sensor plugs in?

Like I said, I think they will zero out on the ohm meter.

Or you can try measuring voltage and see if there is either 5v or 12v there.

I don't know why you want to chase the wires back to the module.

Wants to check continuity, for which he'll need pinouts. Sigh! Don't got 'em - sorry OP.


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  #18  
Old 04-01-2014, 08:01 AM
fdriller9 fdriller9 is online now
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Quote:
Originally Posted by CALWATERBOY View Post
Wants to check continuity, for which he'll need pinouts. Sigh! Don't got 'em - sorry OP.


Attachment 431227
But why can't you just measure continuity at the connector in the wheel well?

If both wires are good, they should zero out.

If not, there will be no reading on the meter.

Same with voltage, if you're getting power at the connector, the wires are most likely ok.
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Old 04-01-2014, 08:01 AM
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Quote:
Originally Posted by betaruce View Post
sensor already replaced but still the same error code 5dc2 right rear sensor

so remaining possibility include:
-still a faulty sensor despite its a new one (should be differentiate by left right swapping)
-faulty wiring from module to sensor (so I am asking where actually the wire locates)
-bearing (but garage claim that he has switched left right but still the same error)

module/pump unit failure?
from what I read, pump is the common failure unit (not the module), with the code 5df0 5df1
i didn't come across a post that a sensor code turn out to be this unit failure in E90

any suggestion would be greatly appreciated

You mean the ABS pump? HERE
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  #20  
Old 04-01-2014, 08:09 AM
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Quote:
Originally Posted by fdriller9 View Post
But why can't you just measure continuity at the connector in the wheel well?

If both wires are good, they should zero out.

If not, there will be no reading on the meter.

Same with voltage, if you're getting power at the connector, the wires are most likely ok.

What's going on at the computer might affect the reading. Best thing to do is disconnect wiring; check each wire w/ohmmeter.

Connected to computer & powered up, if we're getting voltage that wire's OK, but other may have an issue. OP, be careful testing when power applied! Unforeseen, possibly permanent, result may occur.
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Old 04-01-2014, 10:25 AM
fdriller9 fdriller9 is online now
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Quote:
Originally Posted by CALWATERBOY View Post
What's going on at the computer might affect the reading. Best thing to do is disconnect wiring; check each wire w/ohmmeter.

Connected to computer & powered up, if we're getting voltage that wire's OK, but other may have an issue. OP, be careful testing when power applied! Unforeseen, possibly permanent, result may occur.
Yea I know it will be best to check each wire individually but you'll need some pretty long leads to test the wires. Especially the rear sensors.
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  #22  
Old 04-01-2014, 05:01 PM
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Here is a thought. Are you sure the bearing was installed correctly with the magnetic side facing the correct direction?
That would be something I would check first and foremost. If installed incorrectly all the electric trouble shooting in the world will not correct that issue...
At least eliminate that from the possibilities...
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