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Home >> Pontiac >> 2007 >> Solstice Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 195 (Data Communication System) >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Low Speed GMLAN Device >> Circuit/System Testing >> Testing the Serial Data Circuit for an Open/High Resistance
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Testing the Serial Data Circuit for an Open/High Resistance

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. 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 JX 200 splice pack.
  2. Install a 3 A fused jumper wire between the disconnected splice pack connector terminal 1 and a low speed GMLAN serial data circuit terminal that is not communicating.
  3. Ignition ON, verify the scan tool communicates with the control modules connected to the low speed GMLAN serial data circuit.
    • If any control module does not communicate, test each section of the serial data circuit for an open/high resistance. If the circuits test normal, replace the control module that does not communicate when connected.
  4. If all circuits test normal, replace the splice pack.
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