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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Power Outlets) >> Diagnostic Information and Procedures >> Power Outlet Receptacle Malfunction (110V) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. 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 X81 Accessory Power Receptacle - 110V 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.
    • Go to next step: 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.
    • Go to next step: 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.

    • Go to next step: 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.

    • Go to next step: If infinite resistance 
  6. Test for less than 1 V between the AC circuit terminals listed below and ground.
    • AC Terminal 2
    • AC Terminal 7
    • If greater than 1 V 

      Repair the short to voltage in the AC circuit.

    • Go to next step: If less than 1 V 
  7. Test for infinite resistance between the AC circuit terminals listed below and ground:
    • AC Terminal 2
    • AC Terminal 7
    • If less than infinite resistance 

      Repair the short to ground in the AC circuit.

    • Go to next step: If infinite resistance 
  8. Disconnect X1 and X2 harness connectors at the X81 Accessory Power Receptacle - 110V AC.
  9. Test for less than 2 Ω between the AC circuit terminals listed below:
    • X81 Accessory Power Receptacle - 110V AC terminal 3 X1 and the T1 Accessory DC/AC Power Inverter Module terminal 2.
    • X81 Accessory Power Receptacle - 110V 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.

    • Go to next step: If less than 2 Ω 
  10. Ignition ON.
  11. Verify that a test lamp illuminates between the ignition voltage circuit terminal 1 X1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
      • If greater than 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition voltage circuit terminal 1 X1 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.
    • Go to next step: If the test lamp illuminates 
  12. Ignition OFF, connect all harness connectors at the X81 Accessory Power Receptacle - 110V AC. Connect a 110 V extension cord without a connected device to the X81 Accessory Power Receptacle - 110V 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 X81 Accessory Power Receptacle - 110V AC.
    • Go to next step: If the test lamp illuminates 
  14. Test or replace the T1 Accessory DC/AC Power Inverter Module.
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