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flyboy1247 10-01-2012 12:18 PM

ABS/Traction Control
1994 325is. My ABS and Traction Control lights come intermittently while driving. I just replaced the Wheel Speed/ABS Sensors, but I still have the same problem. What do I look for next?

flyboy1247 10-04-2012 11:14 AM

Sorry my post is wrong. It is the ABS & ASC lights that are on.

ZeGerman 10-04-2012 12:04 PM

Am I correct in assuming that you were experiencing these symptoms before you replaced the wheel speed sensors?

flyboy1247 10-04-2012 12:40 PM

That is correct. That was the reason for replacing them. I corrected my earlier post. It is actually the ABS and ASC light rather than the Traction Control Light.

ZeGerman 10-04-2012 01:08 PM

In that case, provided everything is plugged in correctly, it's most likely a faulty ABS control unit.

flyboy1247 10-04-2012 01:13 PM

Everything went back together just fine. Would a bad ABS unit cause the ASC light to come on?

ZeGerman 10-04-2012 01:27 PM

Yes, because the ASC system uses the ABS to modulate wheel spin.

Also, perhaps it seems too simple, but have you checked all related fuses and relays?

flyboy1247 10-04-2012 01:42 PM

If a fuse or relay were bad, wouldn't the lights be on all of the time? They come on intermittently for no apparent reason. They come on sometimes when you apply the brakes, but they will also come while I am just driving down the highway.

ZeGerman 10-04-2012 02:24 PM

Yes, what you're experiencing does make it seem like a fuse or relay is not the issue, but they're worth checking nonetheless. Sometimes relays can get "sticky". But like I said before, if your wheel speed sensors are new and hooked up correctly, barring any fuse or relay issue, that pretty much only leaves the ABS control unit as the culprit.

flyboy1247 10-04-2012 03:58 PM

I will check the fuses and relays first. Is there a test for the ABS Unit? I appreciate your help.

ZeGerman 10-04-2012 04:17 PM

I'm familiar with any kind of testing for the ABS unit, but others here may have some insight.

wheeler000 04-07-2013 12:31 PM

all I can tell you is mine does the same thing

OV2310 04-07-2013 07:03 PM

Ive had the same problem since I got my car and havent had the chance to fix it but I'm going to test my sensors then deal with the abs unit if it doesnt get resolved.

I'll post an update with my solution for you and other people.

Sent from my SAMSUNG-SGH-I717 using Bimmer App

SCJon 04-07-2013 08:06 PM

You could also take a look at the underside of the intake boot. There is an inlet there that vacuum line comes from underneath that plugs into the boot. That line controls the vacuum for ASC. If it is jimmied up somehow then the light could be intermittent with a vacuum leak coming and going? Just a thought and free to check.

wheeler000 04-08-2013 05:56 AM

mine magically stopped ...for now

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