Anti-Theft System Diagnostic System Check
NOTE:
Use this check as starting point for any anti-theft system complaint.
- Connect scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, see SCAN TOOL DOES NOT POWER UP under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - IMPALA & MONTE CARLO article.
- Turn ignition switch to RUN position. Connect scan tool to Data Link Connector (DLC). Using scan tool, attempt to establish communication with Body Control Module (BCM) and Powertrain Control Module (PCM) on Class 2 serial data circuit. If scan tool communicates with BCM and PCM, go to next step. If scan tool does not communicate with BCM and PCM, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - IMPALA & MONTE CARLO article.
- Using scan tool, retrieve DTCs. If BCM and PCM DTCs are present, go to next step. If BCM and PCM DTCs are not present, diagnose by symptom. See SYSTEM TESTS .
- Using scan tool, retrieve DTCs. If DTCs U1000-U1305 are not present, go to next step. If DTCs U1000-U1305 are present, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SELF-DIAGNOSTICS in BODY CONTROL MODULES - IMPALA & MONTE CARLO article.
- Using scan tool, retrieve DTCs. If DTCs P0601 or P0602 is present, see BODY CONTROL MODULES - IMPALA & MONTE CARLO article. If DTCs P0601 and P0602 are not present, go to next step.
- If DTCs B1000, B1007 or B1009 is present, see BODY CONTROL MODULES - IMPALA & MONTE CARLO article. If DTCs B1000, B1007 and B1009 are not present, go to next step.
- If DTCs B1327 or B1328 is present, see BODY CONTROL MODULES - IMPALA & MONTE CARLO article. If DTCs B1327 and B1328 are not present, see DIAGNOSTIC TROUBLE CODE DEFINITIONS table.