Is the DSC Control Unit faulty?

Asked by Apr 10, 2012 at 06:13 AM about the 2002 BMW Z3 3.0i Convertible

Question type: Maintenance & Repair

Hi I have a 2002 Z3 3 ltr that has had water ingress in passenger footwell where the DSC sensors are
the signs were the DSC warning light and brake fluid warning lights permanently on.. After emptying
water and drying out and testing, the YAW sensor showed no output but the lateral acceleration
sensor was showing an output. The YAW sensor was replaced and diagnostic equipment to test DSC
carried out by independent BMW garage who say that the sensors appear to be OK and outputs are
getting to DSC unit (wiring continuity checked) but the diagnostics are not seeing these outputs at
the DSC control unit. Their assessment is that the DSC control unit is also at fault now. Would you also
think this was the case? Looking at wiring the inputs to DSC unit from sensors are to the "base" of
transistor and therefore putting either max 5v or 0v (as probably was the case) would not harm it.
What are your thoughts? Thanks

1 Answer

1,555

look for a used DSC unit from a breaker, these units can suddenly die like that. on later DSC units like the E39 and E46 the electronics were a bolt on module but on the Z3 i think it is a whole valve block. on the E39 you could get it to kick back in by giving the unit a firm tap, but it would always fault again.

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