LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 1998 >> Park Avenue Ultra >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Body Control Module >> Diagnostic Tests >> Scan Tool Does Not Communicate With Class 2 Serial Data Line

Scan Tool Does Not Communicate With Class 2 Serial Data Line

NOTE: To identify components on class 2 serial data line, see in WIRING DIAGRAMS  .
  1. Connect scan tool to another vehicle of same model year to ensure proper operation of scan tool. If scan tool cannot communicate with another vehicle, refer to scan tool manufacturer's instructions. If scan tool can communicate with another vehicle, go to next step.
  2. Turn ignition off. Ensure connections of Data Link Connector (DLC) are clean and tight. DLC is located under instrument panel, left of steering column. Check for any terminals that are not seated properly. Repair as necessary. If connections are okay, go to next step.
  3. Connect scan tool. Turn ignition on, with engine off. If scan tool will turn on, go to step 10). If scan tool will not turn on, go to next step.
  4. Using DVOM, check voltage between DLC connector terminal No. 16 (Orange wire) and ground. If battery voltage exists, go to step 6). If battery voltage does not exist, go to next step.
  5. Repair open or short to ground in Orange wire between DLC connector and I/P junction block Gray, 68-pin connector C1. Recheck system operation.
  6. Check voltage between DLC terminals No. 16 (Orange wire) and No. 5 (Black/White wire). If battery voltage exists, go to step 8). If battery voltage does not exist, go to next step.
  7. Repair open in Black/White wire between DLC connector and ground. Recheck system operation.
  8. Check voltage between DLC terminals No. 16 (Orange wire) and No. 4 (Black wire). If battery voltage exists, go to step 10). If battery voltage does not exist, go to next step.
  9. Repair open in Black wire between DLC connector and ground. Recheck system operation.
  10. Using DVOM, check voltage between DLC connector terminal No. 2 (Purple wire) and ground. If battery voltage exists, go to step 13). If battery voltage does not exist, go to next step.
  11. Using DVOM, check resistance between DLC connector terminal No. 2 (Purple wire) and ground. If resistance is 5 ohms or less, go to step 22). If resistance is not 5 ohms or less, go to next step.
  12. Repair open in Purple wire between DLC connector and Gray, 16-pin connector C200 (body-to-instrument panel harness located under left side of instrument panel, to left of steering column). Recheck system operation.
  13. Disconnect 24-pin connector C206 (instrument panel-to-steering column harness located above steering column). Using DVOM, check voltage between DLC connector terminal No. 2 (Purple wire) and ground. If battery voltage exists, go to step 15). If battery voltage does not exist, go to next step.
  14. Repair short to battery voltage in Purple wires between connector C206, terminals B5 and B6. Recheck system operation.
  15. Disconnect Blue, 24-pin connector C310 (body-to-rear shelf harness located in right front of rear compartment). Using DVOM, check voltage between DLC connector terminal No. 2 (Purple wire) and ground. If battery voltage exists, go to step 17). If battery voltage does not exist, go to next step.
  16. Repair short to battery voltage in Purple wire between connector C206, terminal B5 and connector C310, terminal A3. Recheck system operation.
  17. Reconnect connector C310. Disconnect I/P junction block Brown, 68-pin connector C4. Using DVOM, check voltage between DLC connector terminal No. 2 (Purple wire) and ground. If battery voltage exists, go to step 19). If battery voltage does not exist, go to next step.
  18. Repair short to battery voltage in Purple wire between I/P junction block connector C4, terminal F1 and connector C310, terminal A3. Recheck system operation.
  19. Reconnect connector C206. Using DVOM, check voltage between DLC connector terminal No. 2 (Purple wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, go to step 21).
  20. Check for short to battery in Purple wire between I/P junction block connector C4, terminal D12 and connector C206, terminal B6. Check for internal short to battery in I/P junction block. Repair as necessary. Recheck system operation.
  21. Repair short to battery voltage in Purple wires between I/P junction block connector C4, terminals D1 and E1. Recheck system operation.
  22. Disconnect 24-pin connector C206 (instrument panel-to-steering column harness located above steering column). Using DVOM, check resistance between DLC connector terminal No. 2 (Purple wire) and ground. If resistance is 5 ohms or less, go to step 24). If resistance is not 5 ohms or less, go to next step.
  23. Repair short to ground in Purple wires between connector C206, terminals B5 and B6. Recheck system operation.
  24. Disconnect Blue, 24-pin connector C310 (body-to-rear shelf harness located in right front of rear compartment). Using DVOM, check resistance between DLC connector terminal No. 2 (Purple wire) and ground. If resistance is 5 ohms or less, go to step 26). If resistance is not 5 ohms or less, go to next step.
  25. Repair short to ground in Purple wire between connector C206, terminal B5 and connector C310, terminal A3. Recheck system operation.
  26. Reconnect connector C310. Disconnect I/P junction block Brown 68-pin connector C4. Using DVOM, check resistance between DLC connector terminal No. 2 (Purple wire) and ground. If resistance is 5 ohms or less, go to step 28). If resistance is not 5 ohms or less, go to next step.
  27. Repair short to ground in Purple wire between I/P junction block connector C4, terminal F1 and connector C310, terminal A3. Recheck system operation.
  28. Reconnect connector C206. Using DVOM, check resistance between DLC connector terminal No. 2 (Purple wire) and ground. If resistance is 5 ohms or less, go to next step. If resistance is not 5 ohms or less, go to step 30).
  29. Check for short to ground in Purple wire between I/P junction block connector C4, terminal D12 and connector C206, terminal B6. Check for internal short to ground in I/P junction block. Repair as necessary. Recheck system operation.
  30. Repair short to ground in Purple wires between I/P junction block connector C4, terminals D1 and E1. Recheck system operation.
scientia non olet · About LEMON Manuals