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Home >> Chevrolet >> 2025 >> Traverse Z71 >> Repair and Diagnosis >> Body & Frame >> Fixed And MOVEABLE Windows >> Diagnostic Information And Procedures >> DTC B1066 >> Circuit/System Testing

Circuit/System Testing

  1. Vehicle Off And All Vehicle Systems Off. It May Take Up To 2 Min For All Vehicle Systems To Power Down.
  2. Disconnect The X2 Harness Connector At The X50A Engine Wiring Harness Junction Block.
  3. Test For Less Than 10 Ω Between The X50A Engine Wiring Harness Junction Block Ground Circuit 1351 And Ground.
    • If 10 Ω Or Greater 
    1. Vehicle Off.
    2. Test For Less Than 2 Ω In The Ground Circuit 1351 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 
  4. Connect The X2 Harness Connector At The X50A Engine Wiring Harness Junction Block. Disconnect The X5 Harness Connector At The K9 Body Control Module, Vehicle On.
  5. Verify The E18 Rear Window Defogger Grid Is Not Activated.
    • If The E18 Rear Window Defogger Grid Is Activated 
    1. Vehicle Off, Disconnect The X2 Harness Connector At The X50A Engine Wiring Harness Junction Block, Vehicle On.
    2. Test For Less Than 1 V Between The K9 Body Control Module Circuit 193 And 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 E18 Rear Window Defogger Grid Is Not Activated 
  6. Connect A 3 A Fused Jumper Wire Between The Control Circuit Terminal 22 X5 And B+.
  7. Verify The E18 Rear Window Defogger Grid Activates.
    • If The E18 Rear Window Defogger Grid Does Not Activate 
    1. Vehicle 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 K9 Body Control Module Circuit 193 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, Replace The X50A Engine Wiring Harness Junction Block.
    • Go To Next Step: If The E18 Rear Window Defogger Grid Activates 
  8. Replace The K9 Body Control Module.
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