2002 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE

Door System Diagnostic System Check

  1. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, see TEST D: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS in appropriate BODY CONTROL MODULES article.
  2. Attempt to establish scan tool communication with Body Control Module (BCM). If communication with BCM is established, go to next step. If communication with BCM is not established, see TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article.
  3. Using scan tool, select DISPLAY DTCS function for BCM. 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 does not display any DTCs that begin with "U", go to next step. If scan tool displays any DTCs that begin with "U", see TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article.
  5. If scan tool does not display DTC B1000, go to next step. If scan tool displays DTC B1000, perform DTC B1000: ECU MALFUNCTION under DIAGNOSTIC TESTS in appropriate BODY CONTROL MODULES article.
  6. If scan tool does not display DTCs B1339 or B1349, go to next step. If scan tool displays DTC B1339 or B1349, perform DTC B1339: DEVICE POWER NO. 3 CIRCUIT OPEN or DTC B1349: DEVICE GROUND NO. 1 (CHASSIS GROUND NO. 1) CIRCUIT OPEN under DIAGNOSTIC TESTS in appropriate BODY CONTROL MODULES article.
  7. If scan tool displays any DTCs that begin with "P", see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If scan tool does not display any DTCs that begin with "P", go to next step.
  8. If scan tool displays DTC B3069, B3127, B3128, B3132, B3133, B3137, B3138 or B3272, perform appropriate test. See DIAGNOSTIC TROUBLE CODE INDEX  table. If scan tool does not display DTC B3069, B3127, B3128, B3132, B3133, B3137, B3138 or B3272, repair by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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