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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1353 (Data Communication System) >> Diagnostic Information and Procedures >> DTC U1812 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the inline harness connector X350 at the drive motor generator battery.
  2. Ignition ON, verify that a test lamp illuminates between the wake up signal circuit terminal 10 X350 and ground.
    • If the test lamp does not illuminate, test the circuit for an open/high resistance. If the circuit tests normal, replace the SDG module.
    • If the test lamp illuminates, test the wake up signal circuit of the drive motor generator battery control module electrical harness for an open/high resistance.
  3. If all circuits test normal, replace the drive motor generator battery control module.
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