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1998 "J" & "N" Bodies

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  1. Ensure EBCM is properly connected. See EBCM/EBTCM LOCATION  under REMOVAL & INSTALLATION. Connect scan tool to Data Link Connector (DLC) under left side of instrument panel. Turn ignition on, with engine off. Using scan tool, select ABS DATA LIST. If data is being received from EBCM, go to step 15)  . If data is not being received from EBCM, go to next step.
  2. Ensure Data Link Connector (DLC) connection is secure. If scan tool displays NO COMMUNICATION WITH VEHICLE, diagnose serial data line. See appropriate diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS. If scan tool does not display NO COMMUNICATION WITH VEHICLE, go to next step.
  3. Ensure Data Link Connector (DLC) connection is correct. If scan tool connection to DLC is correct, go to next step. If scan tool connection to DLC is not correct, go to step 26)  .
  4. Turn ignition switch to OFF position. Remove and check battery feed fuse. See BATTERY FEED FUSE IDENTIFICATION  table. If fuse is open, go to step 18)  . If fuse is okay, go to next step.
    BATTERY FEED FUSE IDENTIFICATION

    Application Fuse
    1998 "J" Body CLUSTER (10 Amp)
    1998 "N" Body
    Achieva, Grand Am & Skylark INT LPS (10 Amp)
    Cutlass & Malibu ICC BATT (10 Amp)
  5. Install battery feed fuse. Remove and check switched ignition fuse. See SWITCHED IGNITION FUSE IDENTIFICATION  table. If fuse is open, go to step 21)  . If fuse is okay, go to next step.
    SWITCHED IGNITION FUSE IDENTIFICATION

    Application Fuse
    1998 "J" Body ERLS (10 Amp)
    1998 "N" Body
    Achieva, Grand Am & Skylark ERLS (20 Amp)
    Cutlass & Malibu ICC IGN (10 Amp)
  6. Reinstall switched ignition fuse. Disconnect EBCM connector. Using DVOM, measure resistance between negative battery terminal and ground circuit (Black wire/terminal "D") of EBCM connector. If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 27)  .
  7. Disconnect EBCM connector. Using DVOM, measure voltage between EBCM connector terminal No. 13 or B12 and ground. If voltage equal to or greater than 10 volts, go to next step. If voltage is less than 10 volts, go to step 28)  .
  8. Turn ignition on, but do not start engine. Using DVOM, measure voltage between EBCM connector terminal No. 4 or A9 and ground. If voltage equal to or greater than 10 volts, go to next step. If voltage is less than 10 volts, go to step 29)  .
  9. Turn ignition switch to OFF position. Disconnect negative, then positive, battery cables. Using DVOM, measure resistance between negative battery terminal and ground circuit (Black wire/terminal "D") of EBCM connector. If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 30)  .
  10. Using DVOM, measure resistance between positive battery terminal and battery feed circuit (Orange wire/terminal No. 13 or B12) of EBCM connector. If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 31)  .
  11. Turn ignition on, but do not start engine. Using DVOM, measure resistance between EBCM connector terminals No. 4 or A9 (Pink wire) and positive battery terminal. If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 32)  .
  12. Turn ignition switch to OFF position. Using DVOM, measure resistance between EBCM connector terminals No. 4 or A9 (Pink wire) and DLC terminal No. 9 (Tan wire). If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 ohms, see appropriate diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS.
  13. Using DVOM, measure resistance between EBCM connector terminal No. 4 or A9 (Pink wire) and ground. If resistance is infinite, go to next step. If resistance is not infinite, see appropriate diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS.
  14. Inspect EBCM connector and battery cables for poor terminal contact, terminal corrosion or damage. If there are signs of poor contact, corrosion or terminal damage, go to step 33)  . If there is no damage, corrosion or poor contact, go to step 39)  .
  15. Connect scan tool to DLC. Read DTC display. If any current DTCs are set, go to appropriate DTC. If no current DTCs are set, go to next step.
  16. Turn ignition switch to OFF position. Wait ten seconds. Turn ignition switch to ON position, do not start engine. If amber ABS and/or ETS OFF warning indicator turn on for three seconds and then turn off, go to next step. If amber ABS and/or ETS OFF warning indicator does not turn on for three seconds and then turn off, see appropriate symptom.
  17. Connect scan tool to DLC. Read DTC history display. If any history DTCs are displayed, go to step 40)  . If no history DTCs are set, go to step 41)  .
  18. Replace battery feed fuse with a known good fuse. Wait for ten seconds. Remove and check battery feed fuse. See BATTERY FEED FUSE IDENTIFICATION table. If fuse is open, go to next step. If fuse is not open, go to step 35)  .
  19. Disconnect EBCM connector. Replace battery feed fuse with a known good fuse. Wait for ten seconds. Remove and check battery feed fuse. See BATTERY FEED FUSE IDENTIFICATION table. If fuse is open, go to step 34)  . If fuse is not open, go to next step.
  20. Inspect battery feed circuit (Orange wire) for damage. Inspect EBCM connector and wiring harness for physical damage. Physical damage may cause a short to ground with EBCM connector connected. Reconnect EBCM connector. Reinstall battery feed fuse. Wait for ten seconds. Remove and inspect battery feed fuse. See BATTERY FEED FUSE IDENTIFICATION table. If fuse is open, go to step 25)  . If fuse is not open, go to step 38)  .
  21. Replace switched ignition fuse with a known good fuse. Turn ignition switch to ON position. Do NOT start engine. Wait for ten seconds. Turn ignition switch to OFF position. Remove and inspect switched ignition fuse. See SWITCHED IGNITION FUSE IDENTIFICATION table. If fuse is open, go to next step. If fuse is not open, go to step 37)  .
  22. Turn ignition switch to OFF position. Disconnect EBCM connector. Replace switched ignition fuse with a known good fuse. Turn ignition switch to ON position. Do NOT start engine. Wait for ten seconds. Turn ignition switch to OFF position. Remove and inspect switched ignition fuse. See SWITCHED IGNITION FUSE IDENTIFICATION table. If fuse is open, go to step 36)  . If fuse is not open, go to next step.
  23. Inspect switched ignition circuit (Pink wire) for damage. Physical damage may cause a short to ground with EBCM connector connected. Reconnect EBCM connector. Reinstall switched ignition fuse. Turn ignition switch to ON position. Do NOT start engine. Wait for ten seconds. Turn ignition switch to OFF position. Remove and inspect switched ignition fuse. See SWITCHED IGNITION FUSE IDENTIFICATION table. If fuse is open, go to next step. If fuse is not open, go to step 38)  .
  24. Replace EBCM. Replace switched ignition fuse with a known good switched ignition fuse. See SWITCHED IGNITION FUSE IDENTIFICATION table. After repair is complete, go to step 1)  .
  25. Replace EBCM. Replace battery feed fuse with a known good battery feed fuse. See BATTERY FEED FUSE IDENTIFICATION table. After repair is complete, go to step 1)  .
  26. Disconnect and reconnect scan tool in order to ensure a proper connection. After scan tool is connected properly, go to step 1)  .
  27. Repair open or high resistance in ground circuit (Black wire). After repair is complete, go to step 1)  .
  28. Repair open or high resistance in battery feed circuit (Orange wire). After repair is complete, go to step 1)  .
  29. Repair open or high resistance in switched ignition circuit (Pink wire). After repair is complete, go to step 1)  .
  30. Repair open or high resistance between negative battery cable, negative cable terminals and negative cable connections. After repair is complete, go to step 1)  .
  31. Repair high resistance in battery feed circuit (Orange wire) or voltage feed circuits for battery feed fuse. After repair is complete, go to step 1)  .
  32. Repair open or high resistance in switched ignition circuit (Pink wire), or in power supply circuits from battery or ignition switch. After repairs, go to step 1)  .
  33. Replace all faulty terminals or connectors. After completing repairs, go to step 1)  .
  34. Repair short to ground in battery feed circuit (Orange wire). After repairs, go to step 18)  .
  35. Reinstall battery feed fuse. After repairs, go to step 1)  .
  36. Repair short to ground in switched ignition circuit (Pink wire). After repairs, go to step 21)  .
  37. Reinstall switched ignition fuse. After repairs, go to step 1)  .
  38. Malfunction is intermittent or not currently present. See INTERMITTENTS & POOR CONNECTIONS under DIAGNOSIS & TESTING.
  39. Replace EBCM. After repairs, go to step 1)  .
  40. Review enhanced diagnostics information in scan tool operation manual.
  41. System is okay. See INTERMITTENTS & POOR CONNECTIONS under DIAGNOSIS & TESTING.
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