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 1679 (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 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition On, Engine Off | |||
| ALC Light Sensor | Exterior Lamps | Volts | 0.4-4.4 volts |
| Battery 1 | Exterior Lamps and Interior Lamps | Volts | Battery Voltage |
| Dome Lamp Command | Interior Lamps | On/Off | On when dome lamp requested |
| Dome Lamp Feedback | Interior Lamps | High/Low | Low when dome lamp requested |
| Driver Door Switch | Interior Lamps | High/Low | Low when driver door is open |
| DRL Relay Command | Exterior Lamps | On/Off | On when DRL is requested |
| DRL Relay Feedback | Exterior Lamps | High/Low | Low when DRL is requested |
| Headlamp Feedback. | Exterior Lamps | High/Low | Low when headlamps are requested |
| Inadvertent Power Cmd. | Interior Lamps | On/Off | On when inadvertent power is active |
| Inadvertent Power Feedback. | Interior Lamps | High/Low | Low when inadvertent power is active |
| I/P Dimmer Input | Interior Lamps | Volts | 0.5-4 volts |
| I/P Dimmer Output | Interior Lamps | % DC | 19-100% |
| Key In Ignition | Interior Lamps | Yes/No | Yes with key in ignition |
| Low Beam Input | Exterior Lamps | Volts | 0.4 volts - Battery Voltage |
| Low Beam Input = DRL | Exterior Lamps | Yes/No | No when low beam headlamps are off |
| Low Beam Input = High | Exterior Lamps | Yes/No | No when low beam headlamps are requested |
| Low Beam Input = Off | Exterior Lamps | Yes/No | No when low beam headlamps are requested |
| Low Beam Switch | Exterior Lamps | On/Off | On when low beam headlamps are requested |
| Parklamp Cmd. | Exterior Lamps | On/Off | On when park lamps are requested |
| Parklamp Input | Exterior Lamps | Volts | 4.8 volts - Battery Voltage |
| Parklamp Switch | Exterior Lamps | On/Off | On when park lamps are requested |
| Pass Door Switches | Interior Lamps | High/Low | Low when any passenger door is open |
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.