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Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 275 (Data Communication System) >> Diagnostic Information and Procedures >> DTC U182A >> Circuit/System Testing
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Circuit/System Testing

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  1. Ignition OFF, test for less than 1.0 Ω between the accessory DC power control module case and ground strap.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  2. Disconnect harness connector X3 of the accessory DC power control module.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal A and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If the circuit fuse is open, test the control circuits of the accessory DC power control module for a short to ground.
  4. Ignition OFF, disconnect harness connector X1 of the accessory DC power control module.
  5. 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 wake up signal circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the serial data gateway module.
  6. If all circuits test normal, replace the accessory DC power control module.
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