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Home >> Chevrolet >> 2025 >> Traverse Z71 >> Repair and Diagnosis >> Body & Frame >> Fixed And MOVEABLE Windows >> Diagnostic Information And Procedures >> Windshield Defogger Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Vehicle Off And All Vehicle Systems Off, Disconnect The X1 Electrical Connector At The E49 Windshield Heating Grid. It May Take Up To 2 Min For All Vehicle Systems To Power Down.
  2. Test For Less Than 10 Ω Between The E49 Windshield Heating Grid Ground Circuit Terminal 2 And Ground.
    • If 10 Ω Or Greater 
    1. Vehicle Power Mode - 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. Connect A Test Lamp Between The Control Circuit Terminal 1 And Ground, Vehicle Power Mode - On/Vehicle In Propulsion/Run Mode.
  4. Verify The Test Lamp Does Not Turn On And Off When Pressing The Appropriate Switch On The A26 Heater And Air Conditioning User Interface Control - Front.
    • If The Test Lamp Turns On And Off 

      Test Or Replace The E49 Windshield Heating Grid.

    • Go To Next Step: If The Test Lamp Does Not Turn On And Off 
  5. Vehicle Power Mode - Off, Connect The X1 Electrical Connector At The E49 Windshield Heating Grid. Disconnect The X2 Harness Connector At The X50A Engine Wiring Harness Junction Block, Vehicle Power Mode - On.
  6. Verify The E49 Windshield Heating Grid Is Not Activated.
    • If The E49 Windshield Heating Grid Is Activated 
    1. Vehicle Power Mode - Off, Disconnect The X1 Harness Connector At The E49 Windshield Heating Grid, Vehicle Power Mode - On.
    2. Test For Less Than 1 V Between The E49 Windshield Heating Grid Control Circuit Terminal 1 And Ground.
      • If 1 V Or Greater, Repair The Short To Voltage On The Circuit.
      • If Less Than 1 V, Test Or Replace The E49 Windshield Heating Grid.
    • Go To Next Step: If The E49 Windshield Heating Grid Is Not Activated 
  7. Connect A 10 A Fused Jumper Wire Between The Control Circuit Terminal 5 X2 And B+.
  8. Verify The E49 Windshield Heating Grid Activates.
    • If The E49 Windshield Heating Grid Does Not Activate 
    1. Vehicle Power Mode - Off, Remove The Jumper Wire, Disconnect The X1 Harness Connector At The E49 Windshield Heating Grid.
    2. Test For Infinite Resistance Between The E49 Windshield Heating Grid Control Circuit Terminal 1 And Ground.
      • If Less Than Infinite Resistance, Repair The Short To Ground On The Circuit.
      • Go To Next Step: If Infinite Resistance
    3. 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, All Ok.
    • Go To Next Step: If The E49 Windshield Heating Grid Activates 
  9. Test For Less Than 10 Ω Between The X50A Engine Wiring Harness Junction Block Ground Circuit Terminal 32 X2 And Ground.
    • If 10 Ω Or Greater 
    1. Vehicle Power Mode - 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 
  10. Vehicle Power Mode - Off. Connect The X2 Harness Connector At The X50A Engine Wiring Harness Junction Block.
  11. Disconnect The X5 Harness Connector At The K219 Lighting Control Module, Vehicle Power Mode - On.
  12. Verify The E49 Windshield Heating Grid Is Not Activated.
    • If The E49 Windshield Heating Grid Is Activated 
    1. Vehicle Power Mode - Off, Disconnect The X2 Harness Connector At The X50A Engine Wiring Harness Junction Block, Vehicle Power Mode - On/Vehicle In Propulsion/Run Mode.
    2. Test For Less Than 1 V Between The Control Circuit Terminal 14 X5 @ Control Module Harness & Ground.
      • If 1 V Or Greater, Repair The Short To Voltage On The Circuit.
      • If Less Than 1 V, Test Or Replace The X50A Engine Wiring Harness Junction Block.
    • Go To Next Step: If The E49 Windshield Heating Grid Is Not Activated 
  13. Connect A 3 A Fused Jumper Wire Between The Control Circuit Terminal 14 X5 And B+.
  14. Verify The E49 Windshield Heating Grid Activates.
    • If The E49 Windshield Heating Grid Does Not Activate 
    1. Vehicle Power Mode - Off, Remove The Jumper Wire, Disconnect The X2 Harness Connector At The X50A Engine Wiring Harness Junction Block.
    2. Test For Infinite Resistance Between The Control Circuit Terminal 14 X5 @ Control Module Harness & Ground.
      • If Less Than Infinite Resistance, Repair The Short To Ground On The Circuit.
      • Go To Next Step: If Infinite Resistance
    3. 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 X50A Engine Wiring Harness Junction Block.
    • Go To Next Step: If The E49 Windshield Heating Grid Activates 
  15. Replace The K219 Lighting Control Module.
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