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BCM Diagnostic System Check

WARNING: This page is about a different car, the 1997 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Install a scan tool to Data Link Connector (DLC). DLC is located under driver side of dashboard. Turn ignition on. Using scan tool, attempt to communicate with Body Control Module (BCM). If communication with BCM is successful, go to next step. If communication with BCM is not successful, go to step 3).
  2. Using scan tool, read Body Control Module (BCM) DTCs. If any DTCs are set, see BODY CONTROL MODULE article. If BCM DTCs are not set, system is okay.
  3. Attempt to establish communications with other systems connected to same serial data line (PCM, RFA, IPC, etc.). If scan tool communicates with other systems, go to next step. If scan tool does not communicate with other systems, repair serial data line as necessary. Further information on serial data line testing and repair is not available.
  4. Turn ignition on. Using a test light, check each BCM fuse. If test light is on for all fuses, go to next step. If test light is not on for all fuses, go to step 9).
  5. Turn ignition off. Disconnect 3 BCM connectors. BCM is located behind right kick panel. Turn ignition on. Using a test light, check all BCM connector power circuits. If test light is on for all power circuits, go to next step. If test light is not on for all power circuits, go to step 11).
  6. With a test light connected to battery positive terminal, check all BCM connector ground circuits. If test light is on for all ground circuits, go to next step. If test light is not on for all ground circuits, go to step 12).
  7. Using a DVOM, check for continuity between BCM connector terminal B6 (Light Green wire) and Data Link Connector (DLC) terminal No. 2 (Purple wire). If continuity is present, go to next step. If continuity is not present, go to step 10).
  8. Replace BCM. Program BCM. See BCM PROGRAMMING & RPO CONFIGURATION  under SYSTEM PROGRAMMING. After programming BCM, go to next step.
  9. Repair open in ignition or battery feed to BCM fuse. If fuse is open, locate and repair short in circuit connected to open fuse. After repair is complete, go to step 13).
  10. Locate and repair open in BCM connector B6 (Light Green wire). After repair is complete, go to step 13).
  11. Locate and repair open in BCM power circuit. After repair is complete, go to step 13).
  12. Locate and repair open in BCM ground circuit. After repair is complete, go to next step.
  13. Turn ignition off. Ensure all components and connectors are connected and installed properly. Turn ignition on. Clear DTCs. See CLEARING CODES  under SELF-DIAGNOSTIC TESTING.
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