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 MANUALSCHEVROLET2025TRAILBLAZER ACTIV, 4WDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSREMOTE FUNCTIONSDIAGNOSTIC INFORMATION AND PROCEDURESDTC B305DCIRCUIT/SYSTEM TESTING
2025 Chevrolet Trailblazer ACTIV, 4WD
Circuit/System Testing
2025 Chevrolet Trailblazer ACTIV, 4WDSECTION Circuit/System Testing
- Ignition OFF, disconnect the X1 electrical connector at the K84 Keyless Entry Control Module and the X6 electrical connector at the K9 Body Control Module
- Test circuit 4086 from end to end for less than 10 Ω
- If 10 Ω or greater, repair the open/high resistance on the circuit
- Go to next step: If less than 10 Ω
- Test circuit 4086 between X1 terminal 10 and ground
- If continuity, repair the short to ground
- Go to next step: If infinite resistance
- Test circuit 4086 for short to voltage end to end
- If voltage is present
- Go to next step: Repair the short to voltage on the circuit
- Ignition OFF, connect the X1 electrical connector at the K84 Keyless Entry Control Module
- Using a DMM between X6 terminal 6 and ground, verify the K84 Keyless Entry Control Module is grounding the circuit when Keyless Entry is requested by pressing the transmitter
- If infinite resistance, replace the K84 Keyless Entry Control Module
- Go to next step: If a ground is present
- Replace the K9 Body Control Module
RENDER: 1.0x
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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.