ABS Light. Dealer says DSC hydraulic unit and DSC ECU

bya8 · 23rd January 2013, 13:27

I have read and googled much on this topic. Some have been fixed with throttle actuator or wheel sensor.
What I want to know is how many out there had the DSC hydraulic unit and DSC ECU changed and it did not clear the ABS light permanently?
I've read on a few instances this was the occurence. After the DSC and ECU change, a wheel sensor took care of the light.
The dealer troubleshooting flowchart printout clearly points to DSC.
But I'm not trying to feed them 4G to find out it was a wheel sensor.
Thanks for responses.
04/07 manufacture date M5

bya8 · 24th January 2013, 00:37

Cmon guys. Nobody has any suggestions?

jcolley · 24th January 2013, 14:13

Did they give you any actual fault codes? If you work with an independent BMW repair shop, they may be more willing to actually "diagnose" it than BMW AG's Easter-Egg troubleshooting flowchart.

It's all new to me, but the INPA software has the ability to monitor any sensor on the car. I would imagine you could use it to pull up the DSC module and read any analog values associated with DSC such as wheel speed, lateral acceleration, etc.

It does not make sense to me that both the ECU and the DSC hydraulic unit could fail though.

Ferris · 24th January 2013, 14:24

Quote:

Originally Posted by jcolley

Did they give you any actual fault codes? If you work with an independent BMW repair shop, they may be more willing to actually "diagnose" it than BMW AG's Easter-Egg troubleshooting flowchart.

It's all new to me, but the INPA software has the ability to monitor any sensor on the car. I would imagine you could use it to pull up the DSC module and read any analog values associated with DSC such as wheel speed, lateral acceleration, etc.

It does not make sense to me that both the ECU and the DSC hydraulic unit could fail though.

^This! You need the fault codes to know what exactly failed.

bya8 · 24th January 2013, 17:05

Best price DSC unit is $2500. Ouch!!!

bya8 · 24th January 2013, 23:11

Code: 5df1 dsc connector
5df0 dsc pump motor

What you guys think?

jcolley · 25th January 2013, 01:20

According to ISTA:

5DF1- Hydraulic unit pump motor connector faulty
5DF0- Hydraulic unit pump motor.

Based on that, I would not suspect anything beyond the connector to the motor. If it were me (and the reason I won't go to a dealer), I would disconnect it and perform continuity checks across it. If those prove ok, then motor winding resistance (it has to be DC and likely isn't brushless), even test the motor with a 12V power supply and verify it works properly.

By the dealership method I think the flowchart is:

have problem--->replace stuff randomly

bya8 · 25th January 2013, 03:47

Will try when east coast gets out of the 20s

ET E63 · 27th February 2013, 14:02

I have the same error codes and have been adviced to change the DSC. Before I start spending big money, I would appreciate if you could tell me your final verdict. Was it the connector or did you end up changing the whole DSC control unit and hydraulic unit?

bya8 · 27th February 2013, 14:26

Today I will try plugging in a used dsc unit i bought to see if it clears. Still can't figure out how to get L cabin filter housing off.