I have been searching this forum for many hours and tried several tips on my 2000 ML320 101k miles. I keep getting the ABS/ETS/BAS lights come on randomly. Well, I could drive for a while and they may not come on or come on a few seconds after a start. It seems that they are more related to the outside temperature, because it is a sure thing they come on when it is very hot outside (and humid, its MD).
Now I have tried a few things but still get these lights coming on.
The things I have tried so far are:
1. New brake switch from the MB dealer.
2. exchange the battery with my E320 which is much newer.
3. exchanged the K25 relay several times with other ones in the fuse box.
So far, I still get the lights coming on. I have a Carsoft and scanned the codes and I get code:
C1401 High Pressure Return Pump Circuit Open/Shorted; Will Not Shut Off
Oh, I also jumped relay K25 contacts and made the ABS pump motor manually turn on, and it worked.
Any ideas what could be the problem? I am running out of ideas. Well, I am thinking to open up the ABS module and check the connections there make sure they are ok, as that also seems a common problem. Could it be that?
Any suggestions are greatly appreciated.
Now I have tried a few things but still get these lights coming on.
The things I have tried so far are:
1. New brake switch from the MB dealer.
2. exchange the battery with my E320 which is much newer.
3. exchanged the K25 relay several times with other ones in the fuse box.
So far, I still get the lights coming on. I have a Carsoft and scanned the codes and I get code:
C1401 High Pressure Return Pump Circuit Open/Shorted; Will Not Shut Off
Oh, I also jumped relay K25 contacts and made the ABS pump motor manually turn on, and it worked.
Any ideas what could be the problem? I am running out of ideas. Well, I am thinking to open up the ABS module and check the connections there make sure they are ok, as that also seems a common problem. Could it be that?
Any suggestions are greatly appreciated.