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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sun, Nov-28-2010, 10:29:27 PM   #31
das borgen
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Old Sun, Nov-28-2010, 11:31:27 PM   #32
WRXEATR
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Oh hai
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Old Tue, Mar-01-2011, 01:23:27 AM   #33
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Default Re: The definitive guide to self diagnosing your ABS/ASC light.

I also have a 97 with permanent ABS/ASC lights upon start up, never had the intermittent/while moving issue.

Had the codes scanned by the GT-1

50 - Throttle valve actuator mechanically faulty
81 - wheel speed sensor: front left not installed or faulty
82 - wheel speed sensor: front right not installed or faulty
113 - wheel speed info-front left not detected
114 - wheel speed info-front right not detected

This honestly told me absolutely nothing. I cleaned the sensors and it didn't help. A few days later I started the car and no lights! however that only lasted a few days. After those few days I started the car and the lights were back on. I have a feeling it's not the sensors, based on the fact that I it would be highly unlikely for both left and right sensors to go out at the same time, then come back for a few days, then go out again. I tried a different main ABS relay, that didn't help. Don't think the ASC relay can cause an ABS light, just the ASC light so I didn't replace it. I looked at all ABS related fuses and they look good. My understanding that the brake travel sensor could not cause an upon start up ABS light without even pressing the pedal. Where does this leave me? Bad pump perhaps.

I'll try using this write up to diagnose it as well, although I'm a complete 0 when it comes to electricity
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Old Tue, Mar-01-2011, 01:36:42 AM   #34
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Default Re: The definitive guide to self diagnosing your ABS/ASC light.

great writeup!

thanks a bunch!
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Old Fri, Mar-18-2011, 10:22:33 PM   #35
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Default Re: The definitive guide to self diagnosing your ABS/ASC light.

Can anyone tell me which relay is the ABS pump motor relay? The post states that it's the 5 pole one and not the 6 pole one. The 6 pole is obvious and is labeled "ABS" right on it, the one next to it on the right is labeled "ASC". I've searched and all I see is people referring to a gray relay (where my ASC relays sits), but we don't have them on the M3s?

I also have a 97 M3.

Last edited by ChosenGSR; Fri, Mar-18-2011 at 10:47:22 PM.
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Old Sat, Mar-19-2011, 01:45:20 AM   #36
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Default Re: The definitive guide to self diagnosing your ABS/ASC light.

Excellent info!
This should be made sticky in the diy section.
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Old Sat, Mar-19-2011, 02:11:01 AM   #37
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Default Re: The definitive guide to self diagnosing your ABS/ASC light.

I never got around to diagnosing my permanent ASC OFF light. Might as well try to figure it out now.

I'll tell you one thing, dont EVER let your friends near your M3.

My light has been on since my friend tried to rev my M3's engine using the electronic throttle in the engine bay.... ugh.
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Old Thu, Mar-24-2011, 09:24:22 PM   #38
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Default Re: The definitive guide to self diagnosing your ABS/ASC light.

I used this writeup to diagnose my ABS problem and ran into what might be the issue right away. The resistance test on all 4 sensors yielded good results on 3 of them, with the front right clearly having issues. Sometimes It would show some resistance numbers (although very weird numbers) and sometimes there would be no resistance at all. I went ahead and purchased a new sensor.

If it holds up, my conclusions are as follows:

1. ABS related codes are more often than not useless. IMHO getting your computer scanned might help, but it's far from being useful in many cases. Perhaps clearing the codes and rescanning would yield better results, but all of that costs money for most.

2. Most are under the impression that ABS light cannot be caused by sensors without the car having moved. I suppose there is a resistance check by the ABS computer right away.

3. This thread is extremely helpful. Thank you to the thread starter.

Last edited by ChosenGSR; Sat, May-07-2011 at 02:42:54 PM.
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Old Thu, Apr-21-2011, 06:20:42 AM   #39
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Default Re: The definitive guide to self diagnosing your ABS/ASC light.

good thread... thank you
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Old Sat, Aug-20-2011, 06:40:45 PM   #40
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Default Re: The definitive guide to self diagnosing your ABS/ASC light.

bumping thread.

I have no voltage to 3 of the 5, 12V pins going to the control module.

I removed the ABS 6 pin relay and checked again to see if I had 12V to all the pins again on the connector. I did not, still no change to the 12V pins that didnt have power prior to removing the relay.

All 3 ABS fuses are getting 12V and I have checked the 6 pin relay per the DIY checking resistance and giving it 12V power to hear it click.

What next?

EDIT. MORE SPECIFICALLY. 95 M3 early production

I am getting 12V power from pins 53, 34. Those are coming straight off fuse 21 no power to 3, 15, 33.

Last edited by chase240z; Sat, Aug-20-2011 at 06:46:55 PM.
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Discussing The definitive guide to self diagnosing your ABS/ASC light. in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)