Sierra 3500 4WD V8-6.6L DSL Turbo (2007)
‹› If greater than 1 ohm, repair the ground circuit for an open/high resistance.
5. Attempt to communicate with the electronic brake control module (EBCM). Communication should not be available.
‹› If communication is established, test or replace the resistor.
6. Ignition OFF, disconnect the harness connector of the suspension control module.
7. Attempt to communicate with the EBCM. 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
suspension control module and the terminator resistor. If the circuits test normal, replace the suspension control module.
8. Ignition OFF, disconnect the harness connector of the distance sensing cruise control module.
9. Attempt to communicate with the EBCM. Communication should not be available.
‹› If communication is established, replace the cruise control module.
10. Ignition OFF, disconnect the harness connector of the vehicle communication interface module (VCIM).
11. Attempt to communicate with the EBCM. 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 between
the VCIM and the suspension control module. If the circuits test normal, replace the VCIM.
12. Ignition OFF, disconnect BCM harness connector C3.
13. Test for infinite resistance between the serial data circuits of BCM harness connector C3 terminal 8 and ground and between BCM harness
connector C3 terminal 9 and ground.
‹› If less than infinite, test the circuit for a short to ground.
14. Ignition OFF, disconnect the harness connector of the ECM. Connect the harness connector C3 of the BCM.
15. Attempt to communicate with the EBCM. Communication should not be available.
‹› If communication is established, replace the ECM.
16. Ignition OFF, disconnect the harness connector of the transmission control module (TCM).
17. Attempt to communicate with the EBCM. 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 TCM
and the ECM. If the circuits test normal, replace the TCM.
18. Ignition OFF, connect the harness connector of the suspension control module. Disconnect the harness connector of the EBCM.
19. 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 TCM. If the circuits test normal, replace the EBCM.
20. Ignition OFF, disconnect the harness connector C3 of the BCM.
21. 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.
22. 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.
23. 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.
24. 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
