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.
Circuit/System Testing
2025 Chevrolet Trailblazer ACTIV, FWDSECTION Circuit/System Testing
- Ignition/Vehicle & All vehicle systems - Off
- Disconnect the electrical connector: X5 @ A11 Radio
- Wait for greater than 5 s.
- Connect appropriate EL-52552 pinout tool to A11 Radio
- Ignition - On / Vehicle - In Service Mode
- Test for 7 to 11 V between the test points: Signal circuit terminal @ A11 Radio & Ground (component side)
- If not between 7 and 11 V
Replace the component: A11 Radio
- Go to next step: If between 7 and 11 V
- If not between 7 and 11 V
- Ignition/Vehicle & All vehicle systems - Off
- Disconnect the electrical connector: B87 Rearview Camera
- Locate the appropriate pinout adapter and load test loop adapter from EL-52552 COAX FAKRA Cable Adaptor Kit.
- Connect the 2 adapters together, measure and record the resistance between the terminals at the pinout adapter.
- Disconnect the 2 adapters and connect each one to the appropriate end of the coax cable.
- At the pinout adapter test terminals, measure the total resistance of the coax cable loop including the connected load test adapter.
- If not within 5 Ω of the reading from step 10.
Replace the coax cable
- Go to next step: If within 5 Ω of the reading from step 10.
- If not within 5 Ω of the reading from step 10.
- Replace the component: B87 Rearview Camera
- Apply the parking brake.
- Engine Running Transmission in Reverse
- Verify DTC B127B is not set
- If the DTC is set
Replace the component: A11 Radio
- Go to next step: If the DTC is not set
- If the DTC is set
- All OK.
RENDER: 1.0x
NO RELATED
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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.