Lucerne V6-3.8L VIN 2 (2006)
-> Testing for Intermittent Conditions and Poor Connections See: Testing and Inspection/Component Tests and General Diagnostics
-> Wiring Repairs See: Testing and Inspection/Component Tests and General Diagnostics
Circuit/System Testing
1. With a scan tool verify that communication is not available for all high speed serial data modules.
-> If any high speed module communicates and any DTC beginning with a U exists, refer to Diagnostic Trouble Code (DTC) List - Vehicle for
diagnostics. See: Testing and Inspection/Diagnostic Trouble Code Descriptions
-> If any high speed module communicates and no DTC beginning with a U exists, Refer to DTC U0100-U0299 for diagnostics. See: Testing and
Inspection/Diagnostic Trouble Code Tests and Associated Procedures/U Code Charts
2. Test for less than 1.0 ohm of resistance between the DLC ground circuit terminal 5 and ground.
-> If greater than 1.0 ohm, test the ground circuit for open/high resistance.
3. Ignition OFF, disconnect the harness connector of the BCM.
4. Ignition ON, test for battery voltage between each voltage input circuit of the BCM and ground.
-> If less than battery voltage, test each voltage output circuit of the BCM for a short to ground, and each voltage input circuit of the BCM for a
short to ground or and open/high resistance. If the circuits test normal, replace the faulty module.
5. Test for less than 1 ohm of resistance between each ground circuit of the BCM and ground.
-> If greater than 1 ohm, repair the ground circuit for an open/high resistance.
6. Remove the terminator resistor located in the rear fuse block.
7. Attempt to communicate with the EBCM. Communication should not be available.
-> If communication is established, test or replace the resistor.
8. Ignition OFF, disconnect the harness connector of the suspension control module.
9. 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.
10. Ignition OFF, disconnect the harness connector of the distance sensing cruise control module.
11. Attempt to communicate with the EBCM. Communication should not be available.
-> If communication is established, replace the cruise control module.
12. Ignition OFF, disconnect the harness connector of the vehicle communication interface module.
13. 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 vehicle communication interface module and the suspension control module. If the circuits test normal, replace the vehicle communication
interface module.
14. Ignition OFF, disconnect BCM harness connector C3.
15. 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.
16. Ignition OFF, disconnect the harness connector of the engine control module. Connect the harness connector C3 of the BCM
17. Attempt to communicate with the EBCM. Communication should not be available.
-> If communication is established, replace the engine control module.
18. Ignition OFF, disconnect the harness connector of the transmission control module.
19. 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
transmission control module and the engine control module. If the circuits test normal, replace the transmission control module.
20. Ignition OFF, connect the harness connector of the suspension control module. Disconnect the harness connector of the EBCM.
