G8 V6-3.6L (2008)
3. Ignition ON, test for less than 1 volt between the serial data circuit terminal 1 of the DLC and ground.
‹› If greater than the specified range, test the serial data circuit for a short to voltage.
4. Test for infinite resistance between the serial data circuit terminal 1 of the DLC and ground.
‹› If less than the specified value, test the serial data circuit for a short to ground.
5. Test for less than 2 ohms on the serial data circuit between terminal 1 of the DLC and terminal A of X95.
‹› If greater than the specified range, test the serial data circuit for an open/high resistance.
6. Install a 3-amp fused jumper wire between terminal A and terminal M of X95. Attempt to communicate with the body control module (BCM).
Communication should be available.
‹› If communication is not available test the serial data line between X95, terminal M and harness connector X3, terminal 10 at the BCM for an
open/high resistance.
7. Install another 3-amp fused jumper wire to terminal A of X95.
Important: Allow communications for 5 seconds after connecting a module with the jumper to determine if communication is interrupted
or not.
8. With BCM communications established, use the other end of the jumper wire to connect all other terminals of X95, harness side, one at a time and
verify that low speed communication remains available to the BCM.
‹› If communication is interrupted after connecting an individual module at X95, test the serial data circuit between X95 and the last module
connected for a short to voltage or short to ground. 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) .
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Control Module References (See: Testing and Inspection/Programming and Relearning)
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GMLAN Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
Scan Tool Does Not Power Up
Scan Tool Does Not Power Up
Circuit/System Description
The data link connector (DLC) is a standardized 16 cavity connector. Connector design and location is dictated by an industry wide standard, and is
required to provide the following:
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Scan tool power battery positive voltage at terminal 16
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Scan tool power ground at terminal 4
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Common signal ground at terminal 5
Diagnostic Aids
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The scan tool will power up with the ignition OFF. Some modules however, will not communicate unless the ignition is ON and the power mode
master (PMM) module sends the appropriate power mode message.
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If the battery positive voltage, ground circuits and connections of the DLC are functioning properly, the malfunction must be due to the scan
tool/CANdi module.
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Use the DMM MIN/MAX function to capture/locate intermittent conditions.
Reference Information
Schematic Reference
Data Communication Schematics (See: Diagrams/Electrical Diagrams)
Connector End View Reference