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 DIAGNOSISBRAKESTRACTION CONTROLANTILOCK BRAKE SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESTRACTION CONTROL/STABILITY CONTROL INDICATOR MALFUNCTIONCIRCUIT/SYSTEM TESTING
2025 Chevrolet Trailblazer ACTIV, FWD
Circuit/System Testing
2025 Chevrolet Trailblazer ACTIV, FWDSECTION Circuit/System Testing
- Ignition OFF, disconnect the connector at the S48E Multifunction Switch - Center Console
- Verify a test lamp illuminates between terminal 3 and B+
- If the test lamp does not illuminate
Repair the open/high resistance on circuit 350 or the ground connection.
- Go to next step: If the test lamp illuminates
- If the test lamp does not illuminate
- Ignition ON.
- Verify the scan tool Traction Control Switch parameter is Inactive.
- If not Inactive
- Test circuit 1788 for a short to ground.
- If a short to ground is found, repair the fault on the circuit.
- Go to next step: If a short to ground is not found
- Replace the K9 Body Control Module.
- Go to next step: If Inactive
- Install a 3 A fused jumper wire between terminal 15 and ground.
- Verify the scan tool Traction Control Switch parameter is Active.
- If not Active
- Test circuit 1788 for an open/high resistance.
- If an open/high resistance is found, repair the fault on the circuit.
- Go to next step: If an open/high resistance is not found
- Replace the K9 Body Control Module.
- Go to next step: If Active
- Test or replace the S48E Floor Console Accessory Function Switch.
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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.