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Home >> Pontiac >> 2008 >> G6 Base, 2.4 B >> Repair and Diagnosis >> External Pages >> Different car >> Section 1440 (Data Communication System) >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Low Speed GMLAN Device >> Circuit/System Testing >> Testing the Serial Data Circuits for a Short to Ground

Testing the Serial Data Circuits for a Short to Ground

WARNING: This page is about a different car, the 2010 Pontiac G6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the appropriate harness connectors at the BCM.
  2. Test for infinite resistance between the DLC serial data circuit terminal 1 and ground.
    • If not the specified value, repair the short to ground.
  3. Ignition OFF for 60 seconds, test for greater than 100 Ω between each serial data circuit and ground.
    • If less than the specified range, perform the appropriate test listed below:
      • Serial data circuits with one control module, test the serial data circuit for a short to ground. If the circuit tests normal replace the control module.
      • Serial data circuits with 2 or more control modules, test each section of the serial data circuit for a short to ground. If the circuits test normal, replace the control module that causes the short to ground when connected.
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