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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 1514 (Data Communication System) >> Diagnostic Information and Procedures >> DTC B137B >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector X1 at the APM.
  2. Ignition ON, verify that a test lamp illuminates between the wake up signal circuit terminal 3 and ground.
    • If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance.
  3. Ignition OFF and scan tool disconnected, verify that a test lamp does not illuminate between the signal circuit terminal 3 and ground.
    • If the test lamp illuminates, test the circuit for a short to voltage.
  4. If all circuits test normal, replace the APM.
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