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Body Control Module Diagnostic System Check

  1. Enter on-board diagnostic mode. See ON-BOARD DIAGNOSTICS in BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article. If Body Control Module (BCM) enters on-board diagnostic mode, go to next step. If BCM does not enter on-board diagnostic mode, see BODY CONTROL MODULE INOPERATIVE under SYSTEM TESTS in BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article.
  2. Select DISPLAY BCM DTCs. If any BCM DTC exists, go to appropriate procedure for BCM DTC present. See BODY CONTROL MODULE DTC INDEX table in BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article. If no BCM DTC is present, repair concern by symptom. See SYMPTOM INDEX table under SYSTEM TESTS in BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article.
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