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 1326 (DATA LINK COMMUNICATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESCONTROL MODULE REFERENCES
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Control Module References
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Control Module References
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
Control Module References
| Control Module | Repair Instructions | Diagnostic System Check | Schematic |
|---|---|---|---|
| BPMV | Refer to Brake Modulator Assembly Replacement in Antilock Brake System | Refer to Diagnostic System Check - ABS in Antilock Brake System | Refer to ABS Schematics in Antilock Brake System |
| PCM | Refer to Powertrain Control Module (PCM) Replacement
in Engine Controls - 1.8 L (LV6) or Powertrain Control Module (PCM) Replacement in Engine Controls - 1.8 L (LNK) |
Refer to Diagnostic System Check - Engine Controls
in Engine Controls - 1.8 L (LV6) or Diagnostic System Check - Engine Controls in Engine Controls 1.8 L (LNK) |
Refer to Engine Controls Schematics
in Engine Controls - 1.8 L (LV6) or Engine Controls Schematics in Engine Controls 1.8 L (LNK) |
| SDM | Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement in SIR | Refer to Diagnostic System Check - SIR in SIR | Refer to SIR Schematics in SIR |
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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.