Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2025TRAVERSE HIGH COUNTRY, FWDREPAIR AND DIAGNOSISBODY & FRAMEFIXED AND MOVEABLE WINDOWSDIAGNOSTIC INFORMATION AND PROCEDURESDTC B1066CIRCUIT/SYSTEM TESTING
2025 Chevrolet Traverse High Country, FWD
Circuit/System Testing
2025 Chevrolet Traverse High Country, FWDSECTION Circuit/System Testing
- Vehicle Off And All Vehicle Systems Off. It May Take Up To 2 Min For All Vehicle Systems To Power Down.
- Disconnect The X2 Harness Connector At The X50A Engine Wiring Harness Junction Block.
- Test For Less Than 10 Ω Between The X50A Engine Wiring Harness Junction Block Ground Circuit 1351 And Ground.
- If 10 Ω Or Greater
- Vehicle Off.
- 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
- 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.
- Verify The E18 Rear Window Defogger Grid Is Not Activated.
- If The E18 Rear Window Defogger Grid Is Activated
- Vehicle Off, Disconnect The X2 Harness Connector At The X50A Engine Wiring Harness Junction Block, Vehicle On.
- 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
- Connect A 3 A Fused Jumper Wire Between The Control Circuit Terminal 22 X5 And B+.
- Verify The E18 Rear Window Defogger Grid Activates.
- If The E18 Rear Window Defogger Grid Does Not Activate
- Vehicle Off, Remove The Jumper Wire, Disconnect The X2 Harness Connector At The X50A Engine Wiring Harness Junction Block.
- 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
- 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
- Replace The K9 Body Control 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.