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 1327 (NAVIGATION SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC SYSTEM CHECK - NAVIGATION SYSTEMPERFORMING DIAGNOSTIC SYSTEM CHECK
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Performing Diagnostic System Check
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Performing Diagnostic System Check
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.
To enter the Diagnostic System Check, perform the following procedure:
- Turn the ignition to ACC, with the engine OFF.
- Turn the radio ON and insert the map disc.
- Press and hold the "TA" button on the navigation radio while turning the exterior lights ON and OFF 3 times.
- The System Check is performed and the check result is displayed.
IMPORTANT:
The following information lists the results of the System Check and the appropriate action for that result.
- The System Check Mode results in an "OK" output. Refer to Symptoms - Navigation Systems .
- The System Check Mode results in a "Check" output. Highlight and select the "Check" result. The Unit Check Mode Screen will appear and the DTC codes will be displayed. Refer to Diagnostic Trouble Code (DTC) List .
RENDER: 1.0x
NO RELATED
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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.