E39 ABS + Traction Control Light

[curryinahurry 39]

Hi Team,

My elderly neighbour came around the other day asking for some help on his 2002 525i E39.  Hes got a yellow ABS light, Traction Control Triangle (ASC) and a check engine light on.  He tells me that the ABS light goes off after ~30 minutes of driving.

I gave it a scan on INPA and it looks like his car has a vacuum leak that's causing the CEL.  So the CEL is probably a separate issue.

However, I'm not sure what's causing the ABS and Traction Control light to come on as I cant connect to the ABS/Traction control module.  

I was wonder if a faulty ABS module would cause this?  I heard failures on the flexible PCB within the ABS unit is quite common.

Are they any other tests I can do to diagnose the problem?

Thanks,

Andrew

[dirtydoogle 383]

Scan it with something that will talk to it. Otherwise there is a plethora of things that will cause an ABS fault 

You can test the sensors with a DMM with diode function 

[curryinahurry 39]

2 hours ago, dirtydoogle said:

Scan it with something that will talk to it. Otherwise there is a plethora of things that will cause an ABS fault 

You can test the sensors with a DMM with diode function 

Thanks Doug - by sensors you're referring to the wheel speed sensors?

[dirtydoogle 383]

Yes, there are a few guides online to diagnosing them 

[NZ00Z3 189]

Do you have pins 7 and 8 on the OBD2 connector shorted?  You need this to talk to modules other than the DME and EGS.