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"L" & "M" Series

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. If scan tool powers up, go to next step. If scan tool does not power up, perform SCAN TOOL DOES NOT POWER UP under SYSTEMS TESTS in appropriate BODY CONTROL MODULES article.
  2. Turn ignition switch to RUN position. Attempt to establish communication with BCM. If scan tool communicates with BCM, go to next step. If scan tool does not communicate with BCM, perform SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article.
  3. Select BCM DISPLAY DTCs function on scan tool. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  4. If scan tool displays any DTCs which begin with "U", perform SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article. If scan tool does not display any DTCs which begin with "U", perform appropriate test in accordance with DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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