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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 (12V)CIRCUIT/SYSTEM TESTING
2020 Chevrolet Tahoe LS, 4WD, Gas/Ethanol

Circuit/System Testing

2020 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION Circuit/System Testing

Diagnostic A

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate X80 Accessory Power Receptacle or E32 Cigarette Lighter Receptacle. 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 C 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. Ignition ON.
  4. Verify that a test lamp illuminates between the control circuit terminal A and ground.
    • If the test lamp does not illuminate and the circuit breaker is not clicking open 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the control circuit end to end.
    • If the test lamp does not illuminate and the circuit breaker is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the control circuit terminal A and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the appropriate X80 Accessory Power Receptacle or E32 Cigarette Lighter Receptacle.
    • Go to next step: If the test lamp illuminates 
  5. Test or replace the appropriate X80 Accessory Power Receptacle or E32 Cigarette Lighter Receptacle.

Diagnostic B

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate X80 Accessory Power Receptacle or E32 Cigarette Lighter Receptacle. 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 C 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 control circuit terminal A and ground.
    • If the test lamp does not illuminate and the circuit is not clicking open 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If greater than 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the circuit breaker is not open and there is voltage at the circuit breaker.
    • If the test lamp does not illuminate and the circuit breaker is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the control circuit terminal A and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the appropriate X80 Accessory Power Receptacle or E32 Cigarette Lighter Receptacle.
    • Go to next step: If the test lamp illuminates 
  4. Test or replace the appropriate X80 Accessory Power Receptacle or E32 Cigarette Lighter Receptacle.

Diagnostic C

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate X80 Accessory Power Receptacle. 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 C 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 control circuit terminal A 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 control 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 control circuit terminal A and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the appropriate X80 Accessory Power Receptacle.
    • Go to next step: If the test lamp illuminates 
  4. Test or replace the appropriate X80 Accessory Power Receptacle.
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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.