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Home >> Oldsmobile >> 1999 >> Intrigue GLS, 3.8 K >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Modules >> System Tests >> Scan Tool Does Not Communicate With UART Serial Data Line >> Testing

Scan Tool Does Not Communicate With UART Serial Data Line: Testing

  1. Perform DATA LINK CONNECTOR (DLC) DIAGNOSTIC SYSTEM CHECK  . Go to next step.
  2. If scan tool is properly programmed to communicate with this vehicle, go to next step. If scan tool is not properly configured, go to step  8 .
  3. Connect scan tool to Data Link Connector (DLC) of known good vehicle. Using scan tool, attempt to establish communication with Supplemental Inflatable Restraint (SIR) of known good vehicle. If scan tool communicates with SIR of known good vehicle, go to next step. If scan tool does not communicate with SIR of known good vehicle, go to step  8 .
  4. On faulty vehicle, turn ignition switch to LOCK position. Disconnect SIR Sensing and Diagnostic Module (SDM) connector. Using DVOM, measure resistance between DLC terminal No. 9 (Tan wire) and ground. See appropriate wiring diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS. If continuity is not present, go to next step. If reading is not infinite, go to step  9 .
  5. Turn ignition switch to RUN position. Using DVOM, measure voltage between DLC terminal No. 9 (Tan wire) and ground. If reading is less than 2 volts, go to next step. If reading is greater than 2 volts, go to step  10 .
  6. Turn ignition switch to LOCK position. Using DVOM, measure resistance between DLC terminal No. 9 (Tan wire) and SDM connector terminal No. 5 (Tan wire). If reading is less than 2 ohms, go to next step. If reading is greater than 2 ohms, go to step  11 .
  7. Turn ignition switch to LOCK position. Connect SDM connector. Connect scan tool to DLC. Turn ignition switch to RUN position. Using scan tool, attempt to establish communication with SIR. If communication can be established, go to step  12 . If communication cannot be established, go to step  13 .
  8. Verify operation of scan tool with scan tool manufactures specifications. After repairs, go to step  14 .
  9. Repair short to ground in Tan wire between SDM and DLC. After repairs, go to step  14 .
  10. Repair short to voltage in Tan wire between SDM and DLC. After repairs, go to step  14 .
  11. Repair poor connection or open in Tan wire between SDM and DLC. After repairs, go to step  14 .
  12. Symptom is not present at this time. Check for poor connections between DLC and scan tool. Repair as necessary and go to step  14 .
  13. Go to AIR BAG SERVICE & REPAIR MANUAL for additional diagnostic and repair procedures. After repairs, go to next step.
  14. Connect all disconnected components and connectors. After repairs, go to DATA LINK CONNECTOR (DLC) DIAGNOSTIC SYSTEM CHECK  .
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