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HOMESERVICE MANUALSCHEVROLET2020TAHOE LS, 4WD, GAS/ETHANOLREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTACCESSORIES CONTROL SYSTEMSPOWER OUTLETSDIAGNOSTIC INFORMATION AND PROCEDURESPOWER OUTLET RECEPTACLE MALFUNCTION (230 VOLT)CIRCUIT/SYSTEM TESTING
2020 Chevrolet Tahoe LS, 4WD, Gas/Ethanol

Circuit/System Testing

2020 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION Circuit/System Testing
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 and all vehicle systems OFF, nothing plugged into the X81B Accessory Power Receptacle - 220V AC. Disconnect the harness connector at the T1 Accessory DC/AC Power Inverter Module. It may take up to 2 min for all vehicle systems to power down..
  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 3
    • 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 3
    • 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 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.

    • 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 
    1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module.
    2. Disconnect the harness connector at the S77 Transfer Case Shift Control Switch if equipped.
    3. Test for infinite resistance between the control circuit terminal 14 X5 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • Go to next step: 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.
    • 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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.