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 B3245CIRCUIT/SYSTEM TESTING
2025 Chevrolet Trailblazer ACTIV, FWD
Circuit/System Testing
2025 Chevrolet Trailblazer ACTIV, FWDSECTION Circuit/System Testing
- Ignition/Vehicle - Off
- Disconnect the electrical connector: X1 & X5 @ K9 Body Control Module
- Connect a jumper wire between the test points: Control circuit terminal 6 X1 & Ground
- Momentarily connect a 3 A fused jumper wire between the test points: Control circuit terminal 8 X5 & B+
Verify the component turns On and Off when connecting and disconnecting the jumper wire: M30 Liftgate Latch
- If the component does not turn On and Off
- Ignition/Vehicle - Off & Remove - Jumper wire(s)
- Disconnect the electrical connector: X50A Fuse Block - Underhood
- Ignition - On / Vehicle - In Service Mode
- Test for less than 1 V between the test points: Control circuit terminal 8 X5 @ Control module harness & Ground
- If 1 V or greater - Repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- Ignition/Vehicle - Off
- Test for infinite resistance between the test points: Control circuit terminal 8 X5 @ Control module harness & 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 ohms between the test points:
- Control circuit terminal 8 X5 @ Control module harness & Terminal 14 X2 @ Fuse/Junction Block Harness
- Control circuit terminal 6 X1 @ Control module harness & Terminal 20 X1 @ Fuse/Junction Block Harness
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- If less than 2 ohms - Test or replace the component: X50A Fuse Block - Underhood
- Go to next step: If the component turns On and Off
- Replace the component: 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.