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Remote Keyless Entry Diagnostic System Check

  1. Ensure battery condition, cold cranking amperage and reserve capacity meet specifications. Replace as necessary. Install scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, go to TEST B: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  2. Turn ignition on, with engine off. Try 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, go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH KEYWORD DATA LINE  under SYSTEM TESTS.
  3. Using scan tool, select BCM DTC display function. If any DTCs are displayed, go to next step. If no DTCs are displayed, attempt to diagnose keyless entry system by symptom. See REMOTE KEYLESS ENTRY SYSTEMS - CATERA article.
  4. If scan tool displays any DTCs which begin with a "U", go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH KEYWORD DATA LINE  under SYSTEM TESTS. If scan tool does not display any DTCs which begin with a "U", go to next step.
  5. If scan tool displays DTCs B1000, B1004, B1007, or B1009, replace Body Control Module. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. If scan tool does not display DTCs B1000, B1004, B1007, or B1009, go to next step.
  6. If scan tool displays DTC B1327 or B1328 go to DIAGNOSTIC TROUBLE CODE DEFINITIONS  and perform appropriate test. If no DTCs are displayed, perform symptom diagnosis on keyless entry system. See REMOTE KEYLESS ENTRY SYSTEMS - CATERA article.
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