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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 280 (Power Outlets) >> Diagnostic Information and Procedures >> Power Outlet Receptacle Malfunction (220V) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:

To help avoid personal injury, always treat the accessory power receptacle, accessory DC/AC power inverter module, AC circuit wires, and connectors as if AC high-voltage is present.

  1. Ignition OFF, scan tool disconnected, ignition key removed. Wait for 2 min. Nothing plugged into the X81B Accessory Power Receptacle - 220V AC, disconnect the harness connector at the T1 Accessory DC/AC Power Inverter Module.
  2. Test for less than 10 Ω between the ground circuit terminal 11 and ground.
    • If greater than 10 Ω 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If greater than 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit terminal 6 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the T1 Accessory DC/AC Power Inverter Module.
    • If the test lamp illuminates 
  4. Test for less than 1 V between the signal circuit terminal 12 and ground.
    • If greater than 1 V 

      Repair the short to voltage in the signal circuit.

    • If less than 1 V 
  5. Test for infinite resistance between the signal circuit terminal 12 and ground.
    • If less than infinite resistance 

      Repair the short to ground in the signal circuit.

    • If infinite resistance 
  6. Test for less than 1 V between the AC circuit terminals listed below and ground.
    • AC Terminal 3
    • AC Terminal 7
    • If greater than 1 V 

      Repair the short to voltage in the AC circuit.

    • If less than 1 V 
  7. Test for infinite resistance between the AC circuit terminals listed below and ground:
    • AC Terminal 3
    • AC Terminal 7
    • If less than infinite resistance 

      Repair the short to ground in the AC circuit.

    • If infinite resistance 
  8. Disconnect X1 and X2 harness connectors at the X81B Accessory Power Receptacle - 220V AC.
  9. Test for less than 2 Ω between the AC circuit terminals listed below:
    • X81B Accessory Power Receptacle - 220V AC terminal 3 X1 and the T1 Accessory DC/AC Power Inverter Module terminal 3.
    • X81B Accessory Power Receptacle - 220V AC terminal 3 X2 and the T1 Accessory DC/AC Power Inverter Module terminal 7.
    • If greater than 2 Ω 

      Repair the open/high resistance in the AC circuit.

    • If less than 2 Ω 
  10. Ignition ON.
  11. Verify that a test lamp illuminates between the ignition circuit terminal 1 X1 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the harness connector at the K84 Keyless Entry Control Module.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K84 Keyless Entry Control Module.
    • If the test lamp illuminates 
  12. Ignition OFF, connect all harness connectors at the X81B Accessory Power Receptacle - 220V AC. Connect a 220 V extension cord without a connected device to the X81B Accessory Power Receptacle - 220V AC, ignition ON.
  13. Verify that a test lamp illuminates between the T1 Accessory DC/AC Power Inverter Module signal circuit terminal 12 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the signal circuit end to end.
      • If greater than 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the X81B Accessory Power Receptacle - 220V AC.
    • If the test lamp illuminates 
  14. Test or replace the T1 Accessory DC/AC Power Inverter Module.
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