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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1514 (Data Communication System) >> Diagnostic Information and Procedures >> DTC U209A >> 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 X2 at the SDGM.
  2. Verify less than 0.5 volts between the wake up signal circuit terminal 19 and ground.
    • If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  3. Ignition ON, verify B+ between the communication enable signal circuit terminal 16 and ground.
    • If less than the specified value, test the circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the SDGM.
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