ABS light always on - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-14-2007, 12:58 AM   #1
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Default ABS light always on

Hey guys, I'm working on the '93 Lesabre again...

The ABS light comes on when the car is started and never goes off. And as predicted, anti-lock felt when making a hard stop. It was on when we bought the car, and even though I've bled all the lines, replaced the master cylinder (and bled the lines again) the light is still on. The brake fluid level is correct.

Can the ABS light be set to flash a code, or does it have to be pulled with a scanner? Would the free scan from like Advance or Autozone pull it, or do I have to have a TechII pull it?

Thanks guys.
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Old 11-14-2007, 08:50 AM   #2
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Traditional braking component repairs will have very little to no effect on ABS.

It'* either the PMV, EBCM, a WSS (in the hub), or wiring. You need a dealer to pull the code. They'll typically charge 80 bucks or more minimum shop rate to do so.
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Old 11-14-2007, 11:43 PM   #3
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Thanks Will, I was thinking it would be a sensor
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Old 11-15-2007, 01:34 AM   #4
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The dealer isnt the only one that can pull codes. We use a Snap-on Solas at my shop and a Modis at my other shop. Both are capable of pulling ABS codes...and much more. There are many indepentant shops that have the same scanners and charge a lot less than the dealer. For example, our rate is $52 an hour for diagnostics, which is a lot less than the dealer. Just saying that there is that other option out there
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Old 11-15-2007, 02:49 AM   #5
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Right. I found a small town shop that used a Snap-on right out of my OBD port on my '94. They only charged $20. They correctly diagnosed a left front hub.
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Old 11-15-2007, 09:24 AM   #6
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92/93 can't do that.

ABS codes are not routed through the ALDL connector/port.

It requires a serial reader between the EBCM and it'* connector.
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Old 11-15-2007, 06:20 PM   #7
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Thanks for the replies guys. That reminded me that my neighbor has a Snap On scanner and can probably pull it, so I'll ask him. I'll reply back with whatever it is
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Old 11-15-2007, 06:26 PM   #8
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(edited--oops, one post behind again)

re willwren'* comment:

Ah, thanks, now I understand. The EBCM connector is above and to the right of the accelerator pedal, correct? (hope I'm not getting this thread off-track, but this stuff is pretty confusing to keep track of )

F14crazy:

In view of what willwren said above (in his last post), any scanner is going to have to have a very special connector to attach to the EBCM socket.
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Old 11-16-2007, 01:17 AM   #9
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Slug, for the 93 in question, yes, the EBCM is under the carpet, behind the stereo on the firewall, to the right of the GO FAST pedal.

94 and 95 (and later) the EBCM moved to the engine compartment.

A snapon scanner will be useless on an ABS issue for a 92/93.
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Old 11-16-2007, 08:43 AM   #10
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jI've seen some Snap on'* that appeared to have different connectors for the various ABS etc. I'd suggest asking at the least.
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