Lucerne V6-3.8L VIN 2 (2006)
21. Attempt to communicate with the suspension control module. Communication should not be available.
-> If communication is established, test the serial data circuits for a short between them, short to ground or a short to voltage between the EBCM
and the transmission control module. If the circuits test normal, replace the EBCM.
22. Ignition OFF, disconnect the harness connector C3 of the BCM.
23. Test for less than 1 volt between the high speed GMLAN serial data circuits of the DLC and ground.
-> If greater than 1 volt, test the serial data circuit for a short to voltage.
24. Test for infinite resistance between the high speed GMLAN serial data circuit of the DLC and ground.
-> If less than infinite resistance, test the serial data circuit for a short to ground.
25. Test for infinite resistance between the high speed GMLAN serial data (+) and (-) circuits of the DLC.
-> If less than infinite resistance, test the serial data circuits for a short between them.
26. If the circuits test normal, replace the BCM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair. See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated
Procedures/Verification Tests and Procedures
-> Control Module References for module replacement, setup, and programming. See: Testing and Inspection/Programming and Relearning
-> GMLAN Wiring Repairs See: Testing and Inspection/Component Tests and General Diagnostics
