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 PROCEDURESNAVIGATION DIAGNOSTIC SELF-TEST FEATURESDISPLAY CHECK
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Display Check
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Display 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.
Selecting "Display Check" will display the Display Check menu. The following test options can be selected:
- Color Bar Check - Color bars are displayed with the corresponding color name above each bar. The entire screen is changed to the color which is selected in the color bar check mode. These bars can be compared with the Color Bar Check in the Navigation Check to insure that no difference is found. If the colors are not correct, replace the navigation radio. Refer to Radio Replacement .
- Remote Commander Check - The name of the panel switch button being depressed will be displayed. If one or more of the buttons are not working properly replace the navigation radio. Refer to Radio Replacement in Entertainment.
- Vehicle Signal Check - The inputs from the following sensors will be displayed:
- Reverse - Reverse signal status displayed as ON when vehicle is in reverse and OFF when vehicle is not in reverse. The navigation system uses this input in conjunction with other inputs to determine the vehicles direction of travel. If this signal is not received check the Backup Lamp Switch circuit on manual transmission vehicles and the Park/Neutral Position Switch circuit on automatic transmission vehicles. Refer to Navigation System Schematics .
- Speed - Indicates current speed of the vehicle. The navigation system uses this input in conjunction with other inputs on order to determine the vehicles position. If this input is not received check the Vehicle Speed Sensor circuit. Refer to Navigation System Schematics .
- Tail - Status of the park lamps displayed as ON/OFF. This signal is used to dim the display and access the diagnostic mode. If this signal is not received, the Diagnostic System Check and the Diagnostic Self-Test cannot be accessed. Check the Park Lamp Input circuit. Refer to Navigation System Schematics .
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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.