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Diagnostic System Check

  1. Reconnect all previously disconnected components. Turn ignition on, with engine off. Connect scan tool to Data Link Connector (DLC) under left side of instrument panel. If scan tool communicates with EBCM/EBTCM, go to next step. If scan tool does not communicate with EBCM/EBTCM, proceed to TEST G: NO COMMUNICATION WITH EBCM/EBTCM  under SYMPTOM DIAGNOSTIC TESTS.
  2. With scan tool in ABS/TCS SPECIAL TESTS, run AUTO TEST. Using scan tool, display ABS/TCS DTCs. If any current DTCs are set, go to appropriate DTC for diagnosis. If no current DTCs are set, go to next step.
  3. Turn ignition off. Disconnect scan tool. Turn ignition on, with engine off. If ANTI-LOCK indicator illuminates and then goes out, go to next step. If ANTI-LOCK indicator does not illuminate, go to step 6).
  4. If vehicle is equipped with traction control system, go to next step. If vehicle is not equipped with traction control system, go to step 11).
  5. Turn ignition on, with engine off. If TRACTION OFF indicator illuminates and then goes out, go to step 7). If TRACTION OFF indicator does not illuminate, go to step 8).
  6. If ANTI-LOCK indicator remains illuminated, proceed to TEST A: ABS INDICATOR ON WITH NO DTCS SET . If ANTI-LOCK indicator goes out, proceed to TEST B: ABS INDICATOR INOPERATIVE WITH NO DTCS SET  under SYMPTOM DIAGNOSTIC TESTS.
  7. On Eighty-Eight, LSS and Regency, go to step 9). On Bonneville and LeSabre, go to step 11).
  8. If TRACTION OFF indicator remains illuminated, proceed to TEST C: TRACTION OFF INDICATOR ON WITH NO DTCS SET  under SYMPTOM DIAGNOSTIC TESTS. If TRACTION OFF indicator goes out, proceed to TEST D: TRACTION OFF INDICATOR INOPERATIVE WITH NO DTCS SET  under SYMPTOM DIAGNOSTIC TESTS.
  9. Turn ignition on, with engine off. If TRACTION ACTIVE indicator illuminates and then goes out, go to step 11). If TRACTION ACTIVE indicator does not illuminate, go to next step.
  10. If TRACTION ACTIVE indicator remains illuminated, proceed to TEST E: TRACTION ACTIVE INDICATOR ON WITH NO DTCS SET  under SYMPTOM DIAGNOSTIC TESTS. If TRACTION ACTIVE indicator goes out, proceed to TEST F: TRACTION ACTIVE INDICATOR INOPERATIVE WITH NO DTCS SET  under SYMPTOM DIAGNOSTIC TESTS.
  11. If any history DTCs are set, go to next step. If no history DTCs are set, system is okay.
  12. Go to appropriate history DTC for diagnosis. Investigate conditions required for DTC to set. Drive vehicle faster than 15 MPH for several minutes while monitoring scan tool for ABS/TCS DTCs. Check if history DTC set as current DTC while driving vehicle. If any current DTCs are set, go to appropriate DTC for diagnosis. If no current DTCs are set, system is okay.
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