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 21 (ANALOG INSTRUMENT PANELS)SYSTEM TESTSTEST V: SECURITY INDICATOR INOPERATIVE
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Test V: Security Indicator Inoperative
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test V: Security Indicator Inoperative
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 GMC Savana Special, 2001 GMC Savana Camper Special, 2001 GMC Savana, 2001 Chevrolet RV Cutaway, and 2001 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- If theft deterrent system diagnostic system check has been performed, go to next step. If theft deterrent system diagnostic system check has not been performed, go to THEFT DETERRENT SYSTEM DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM.
- Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC), located below steering column. See Figure . Turn ignition switch to RUN position. Using scan tool, command Instrument Panel Cluster (IPC) lights off. If SECURITY indicator does not turn off, go to next step. If SECURITY indicator turns off, check for intermittent or poor connections. Repair as necessary.
- Disconnect Passlock(tm) Module Green 16-pin harness connector. Connect a fused jumper wire between ground and Passlock(tm) control module harness connector terminal B2 (Yellow wire). See Figure . If SECURITY indicator illuminates, go to next step. If SECURITY indicator does not illuminate, go to step 5 .
- Check Passlock(tm) module connector for intermittent or poor terminal contact. If terminal contact is okay, go to step 6 . If terminal contact is not okay, repair as necessary. After repair, go to step 7 .
- Repair open or high resistance in Yellow wire between Passlock(tm) module and IPC. After repair, go to step 7 .
- Replace Passlock(tm) module. See PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS in ANTI-THEFT SYSTEMS article in ELECTRICAL. After repair, go to next step.
- Operate system to verify fault no longer exists. If fault still exists, go to step 2 .
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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.