pulling codes service abs
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Advanced
Joined: Jan 2010
Posts: 90
Likes: 4
From: Henderson Nevada
pulling codes service abs
I was looking under the rear compartments in my 90 conv. today and discovered the abs unit and controller was unplugged by the previous owner. (now I know why hard pedal). Anyway I plugged everything back in and started the car. I now have the service abs light on. how do I pull the abs code so I can start to diagnose and repair the problem properly. thanks always Rich
Burning Brakes
Joined: Sep 1999
Posts: 786
Likes: 31
Cruise-In II Veteran
You can pull most (but not all) of the ABS codes by grounding Pin "H" of the ALDL connector and then turning the ignition on.
After about 3-4 seconds a code sequence will flash beginning with a Code 12 to begin the sequence. After all of the codes have flashed Code 12 will be displayed again. Each stored code should flash 3 times before beginning the next code.
There are a total of 18 codes of which 5 are supposedly accessible only with GM's Tech 1 code reader.
Pull your codes and then let us know. (I am to lazy to type out the meaning of all 18)!
If you have a copy of the Service Manual it is all there on page 5E1-2.
After about 3-4 seconds a code sequence will flash beginning with a Code 12 to begin the sequence. After all of the codes have flashed Code 12 will be displayed again. Each stored code should flash 3 times before beginning the next code.
There are a total of 18 codes of which 5 are supposedly accessible only with GM's Tech 1 code reader.
Pull your codes and then let us know. (I am to lazy to type out the meaning of all 18)!
If you have a copy of the Service Manual it is all there on page 5E1-2.
Last edited by Wildride; Apr 24, 2010 at 04:28 PM.
