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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 452 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTICSPASSENGER PRESENCE FLASH CODE PROCEDUREFLASH CODE PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Flash Code Procedure
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Flash Code Procedure
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure passenger front seat is empty. Install scan tool to Data Link Connector (DLC), located under left side of instrument panel.
- Turn ignition on. Using scan tool, request PPS to flash DTC's. When PPS receives a valid request to flash DTC's PPS will do the following:
- Illuminate both PASSENGER AIR BAG ON and OFF indicators, located on inside rear view mirror, for one second.
- Turn off both PASSENGER AIR BAG ON and OFF indicators for one second.
- Flash the first digit of DTC using the OFF indicator. Count number of flashes to determine first DTC digit.
- Flash the second digit of DTC using ON indicator. Count number of flashes to determine second DTC digit.
- When flashing procedure is initiated, PPS will flash all current and history DTC's. After all DTC's have been flashed, PPS will re-flash DTC's that are stored as current DTC's. Any DTC that is not re-flashed is a history DTC.
- If flashing procedure was unsuccessful, repeat flashing procedure. Due to communication status between SDM and PPS, procedure may need to be repeated until a successful flash sequence has been achieved. Diagnose and repair applicable SIR DTC's. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table.
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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.