Flash Code Diagnostics
Ground pin "H" to pin "A" of ALDL connector. See Fig 1. Connector is located under dash, near middle of instrument panel. Turn ignition on. Diagnostic display mode remains enabled as long as pin "H" is grounded, serial data link communications has not been initiated, and vehicle speed is less than 4 MPH.
About 3 seconds after ALDL pin "H" is grounded, EBCM will begin flashing ANTI-LOCK light in code sequence. Sequence will begin with Code 12, signaling beginning of fault code display. Each stored code will be displayed 3 times. After all codes have been displayed, sequence will repeat, starting with Code 12. If no code is present, go to SYMPTOM DIAGNOSIS .
NOTE:
Certain codes can only be read through the ALDL connector using Tech 1 Diagnostic Computer.