Hello all. I have the same 3 lights on my '03 R53 MCS. No ABS and DSC, but tire pressure is fine all around and that light is also on all the time.

To test the 4 pin combinations for which speed sensor is bad, do I need to remove the whole DSC control module/ABS hydraulic unit ala Bentley section 340-38?

I can open the control module enough to see the numbered pin holes without removing the whole unit, but the bottom of that unit seems to be hinged and this prevents sufficient access to get my multi-meter in to test the pins like Rx808 and oviluca.

Am I missing an easier route to test the pin voltage??

Thank you in advance.

-cd

 

I've got this problem. I replaced both front ws sensors, since that seemed to be a common fault point. Lights are still on. Dealer says it seems to be an issue with the steering pos sensor on the column. They say it might need to be recalibrated or replaced. Does anyone know how to recalibrate? Any tests I should perform to verify the fault?

Thanks.

 

Hi all,

Sorry to relive an old thread.

I'm facing the same issue on a 2010 MCS N18. The ISTA+ shows the below fault. The fault is very intermittent. It can be okay for days and then come out for a few days. When it happens, the wheel speed is @ 255km/h,

I've changed the sensor on RR wit genuine BMW part as well changed the wheel bearings.

What could be the problem? Bad new sensor? The error seems to indicate a voltage range problem. Wire pair shorted? Couldn't be dirty connection/harness pins right? If that was the case, the error wouldn't be voltage range. There would be no voltage at all. I really hate to have to strip the car and trance the wire from the rear sensor to the front ABS control unit. I haven't brought out the DVOM to really test the resistance, etc because the fault is just so damn intermittent. Now you see it and now you don't.

Any inputs are appreciated. Thanks!

 

Did you ever find out the reason behind this, I have the same problem with my 2007 mcs

 

After lengthy discussions and research, we found these strange problems were all resulted in the tachometer sending surges through the CAN data lines, setting off errors in OTHER modules that resulted in this mess. The front ABS sensors are not bad and are not a common problem...but, ABS sensors are the most common fault code this tach surge problem generates. It also makes the gauge go nuts, disables two CVT solenoids and pretty much makes your car have a dangerous seizure. Unplug the tach and you'll see that the only problem will show the communication error with the aux instrument cluster. It took me weeks to figure this out, but I did find water in the ABS harness loop and the shorting large battery cable from the battery to the underhood fusebox. I believe this short, not in clear view under the battery, or other insulation missing shorts, perhaps damage the tach and results in it's strange and destructive behavior. Hopefully, the tach you buy will not be damaged like this. You'll clearly realize, after disconnecting it, that it's the entire problem. A good tach will take care of it. It's sad to me how such a little part can trash the reputation of such a nice car. Hopefully, you discover this problem and keep your little beast on the road...lol.

 

Does the R53 have only 2-speed sensors located on left-front and right rear correct? Thanks

 

When I had this problem I read that 2002-2003 models only had two but later ones had 4.