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 1082 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DATA LIST
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Scan Tool Data List
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Scan Tool Data List
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Scan Tool Data List
| Scan Tool Parameter | Data Display | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition in the ON position. Bright light applied to the DRL ambient light sensor. Park brake not set. Headlamp switch in the OFF position. IP Lamp switch in the OFF position. Interior lamp defeat switch in the OFF position. Fog lamp switch in the OFF position. | |||
| Ambient Light Sensor | Data List | Volts | 2.1 volts |
| Ambient Light Sensor | Inputs | Active/Inactive | Inactive |
| Ambient Light Sensor Relay | Outputs | Off/On | On |
| Backlight Dimming | Data List | Percent | 0 |
| Backlight Dimming | Outputs | Off/On | Off |
| Courtesy Lamp Switch | Inputs | Active/Inactive | Inactive |
| Dimming Switch | Data List | Volts | 0 |
| DRL Relay | Outputs | Off/On | On |
| Fog Lamp Relay | Outputs | Off/On | Off |
| Fog Lamp Switch | Inputs | Active/Inactive | Inactive |
| High Beam Input | Data List | Volts | 0 |
| Headlamp Relay | Outputs | Off/On | Off |
| Headlamp Switch | Inputs | Active/Inactive | Inactive |
| High Beam Low Level | Inputs | Active/Inactive | Active |
| High Beam High Level | Inputs | Active/Inactive | Inactive |
| Inadvertent Power Relay | Outputs | Off/On | On |
| Interior Lamp Switch | Inputs | Active/Inactive | Inactive |
| Park Break Switch | Inputs | Active/Inactive | Inactive |
| Park Lamp Relay | Outputs | Off/On | Off |
| Park Lamp Monitor | Inputs | Active/Inactive | Inactive |
| Theater Lighting | Outputs | Off/On | Off |
RENDER: 1.0x
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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.