Another Active Steering Question
I've searched these forums for hours, reading countless posts about Active Steering failures, but I haven't found what I need, so hopefully someone can offer some insight...
My e60 is reporting Active Steering malfunction and has been for some time now. I tried all the quick & easy fixes (resetting the system, having the battery/alternator checked), but no luck. I took it to an indy mechanic who found fault codes on the steering angle sensor. After saving up some cash for a month, I had him replace the SAS, but the active steering is still malfunctioning. Now he's telling me that the DSC module is also throwing fault codes that weren't there previously.
I have noticed that on especially colder mornings, the active steering will often work fine for about 3-5 minutes until the car warms up, at which point the system deactivates again. For those 3-5 minutes, the system works perfectly. Since the system does work properly on occasion, it leads me to believe that there might not necessarily be something wrong with the computer circuit in the DSC module, and there certainly doesn't seem to be a total pump failure.
Can anyone offer any insight into a possible alternative solution before I pay my mechanic $1400 to replace the DSC module? I know engine fluids behave very differently at extreme temperatures, so my inclination is to think that may be the issue. Is there any reason that an Active Steering system would work fine when the power steering fluid is cold (more viscous), but malfunction once the fluid heats up a bit?