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Abs Diagnostic Codes

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1990 Pontiac Bonneville, 1990 Oldsmobile Ninety-Eight, 1990 Oldsmobile Eighty-Eight, 1990 Cadillac Fleetwood, and 1990 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
  1. With ignition off, ground ALDL connector (pin H), located under dash on driver's side of vehicle. Turn ignition switch to "RUN" and count "ANTI--LOCK" lamp flashes. This is the first digit of the trouble code. The lamp will pause (remain off) for 3 seconds then begin flashing the second digit of the code. If lamp turns on for 4 seconds then turns off, no trouble codes are present, return to FUNCTION CHECK.
  2. Leave ignition in "RUN" position. After the first code has been displayed, record code and unground ALDL. Ground connector a second time and repeat counting flashes as in step 1). This will be the second code. Record second code and repeat step 2) until there are no more codes.
  3. Repair indicated problem before clearing codes. All codes must be displayed before EBCM will clear memory. Drive vehicle above 18 MPH. Display codes and repeat step 3) until no more codes display.
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