LaCrosse V8-5.3L (2008)
Description and Operation
Data Link Communications Description and Operation (See: Description and Operation)
Electrical Information Reference
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Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics)
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Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
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Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics)
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Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for Scan Tool Information
Circuit/System Testing
1. 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.
2. Ignition OFF, disconnect the harness connector (splice pack comb) at JX 205. Install a 3-amp fused jumper wire between JX 205 terminal A and
terminal M, harness side.
3. Ignition ON, with a scan tool, attempt to communicate with the body control module (BCM). Communication should be available.
‹› If no communication, test the serial data circuit for a short to ground, a short to voltage or an open/high resistance between the BCM and the
DLC. If the circuit tests normal, replace the BCM.
4. Install another 3-amp fused jumper wire to JX 205 terminal A, harness side.
5. With BCM communications established, use the other end of the jumper wire to connect all other terminals, harness side, one at a time and verify
that communication remains available to the BCM.
Important: Allow communications for 5 seconds after connecting a module with the jumper to determine if communication is interrupted
or not.
‹› If communication is interrupted after connecting an individual module at JX 205, test the serial data circuit between JX 205 and the last
module connected for a short to ground and short to voltage. If the circuit tests normal, replace the module that caused no communication.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests
and Procedures) after completing the repair.
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Control Module References (See: Testing and Inspection/Programming and Relearning)for module replacement, setup, and programming
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GMLAN Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
