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Home >> Pontiac >> 2007 >> G5 Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Theft Deterrent System) >> Diagnostic Information and Procedures >> DTC B0685 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the IPC.
  2. Connect a test lamp between the control circuit terminal 14 and B+.
  3. Ignition ON, command the Security LED ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the IPC.
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