Read Anti-Lock codes on a 1999 Lumina Car

Does anyone know how to read Anti-Lock brake code on a GM 1999 Lumina with a Bosch system. Can you get the codes to flash using just the dash light? Or do we have to have a dealer or other shop pull the
codes using a good scanner.
Robert Wynkoop
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You need an abs function scanner to get the codes and see the wheel speed sensor inputs.

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