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, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEBODY, CAB CONTROL SYSTEMSVEHICLE ACCESS SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B153F - LIFTGATE OBJECT SENSOR MALFUNCTIONCOMPONENT TESTING
2025 Chevrolet Trailblazer ACTIV, FWD
Component Testing
2025 Chevrolet Trailblazer ACTIV, FWDSECTION Component Testing
- Ignition/Vehicle - Off
- Disconnect the appropriate electrical connector: B71R Liftgate Object Sensor - Right or B71L Liftgate Object Sensor - Left
- Test for 8k ohms to 12 kohms between the test points: Signal terminal 1 & Low Reference terminal 2 - Not Pressed
- If not between 8k and 12k ohms
Replace the component: B71R Liftgate Object Sensor - Right or B71L Liftgate Object Sensor - Left
- Go to next step: If between 8k and 12k ohms
- If not between 8k and 12k ohms
- All OK.
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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.