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 1606 (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 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Body Control Module (BCM) Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Vehicle in PARK/Park brake RELEASED/Headlamps in AUTO/All doors/tailgate closed | |||
| Battery Voltage | Data | Volts | Varies |
| Light Sensor | Data | Volts | 1.75 Volts Maximum Light to 4.9 Volts Maximum Dark |
| Low Beam Duty Cycle | Data | Percent | 0%/81%/100% |
| Dimming Input | Data | Volts | Varies |
| Dimming Level | Data | Percent | 0% |
| Backlight Dimming | Data | Percent | Varies |
| Indicator Dimming | Data | Percent | Varies |
| Ignition 0 | Inputs | On/Off | On |
| Ignition 1 | Inputs | On/Off | On |
| Ignition 3 | Inputs | On/Off | On |
| Key In Ignition | Inputs | Yes/No | Yes |
| Left Rear Door Ajar Sw. | Inputs | On/Off | Off |
| Right Rear Door Ajar Sw. | Inputs | On/Off | Off |
| Flash to Pass Switch | Inputs | On/Off | Off |
| Interior Lamp Defeat Switch | Inputs | On/Off | On/Off |
| Headlamp Switch | Inputs | Active/Inactive | Inactive |
| Parklamp Switch | Inputs | Active/Inactive | Inactive |
| Front Wipers Active | Inputs | Yes/No | No |
| High Beam Switch | Inputs | On/Off | Off |
| Courtesy Lamp Switch | Inputs | Active/Inactive | Inactive |
| Front Fog Lamp Switch | Inputs | On/Off | Off |
| Rear Fog Lamp Switch | Inputs | On/Off | Off |
| Park Brake Switch | Inputs | Set/Released | Released |
| Inadvertent Power Relay | Inputs | On/Off | Off |
| High Beams | Output Control | On/Off | Off |
| Low Beam Duty Cycle | Output Control | Percent | 0%/81%/100% |
| Park Lamp Relay | Output Control | On/Off | On/Off |
| Backup Lamps | Output Control | On/Off | Off |
| Dimming Level | Output Control | Percent | Varies |
| Inadvertent Power Relay | Output Control | On/Off | On |
Driver Door Module (DDM) Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Vehicle in PARK/Park brake RELEASED/Headlamps in AUTO/All doors/tailgate closed | |||
| Battery 1 | Data | Volts | Varies |
| Battery 2 | Data | Volts | Varies |
| Dimming Potentiometer | Data | Percent | Varies |
| Window Switch Backlight | Data | Percent | Varies |
| Memory Switch Backlight | Data | Percent | Varies |
| Mirror Switch Backlight | Data | Percent | Varies |
| Dimming Enable | Inputs | On/Off | On |
| Door Ajar Switch | Inputs | On/Off | Off |
Passenger Door Module (PDM) Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Vehicle in PARK/Park brake RELEASED/Headlamps in AUTO/All doors/tailgate closed | |||
| Battery 1 | Data | Volts | Varies |
| Battery 2 | Data | Volts | Varies |
| Dimming Potentiometer | Data | Percent | Varies |
| Window Switch Backlight | Data | Percent | Varies |
| Memory Switch Backlight | Data | Percent | Varies |
| Door Ajar Switch | Inputs | On/Off | Off |
Lift Gate Module (LGM) Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Vehicle in PARK/Park brake RELEASED/Headlamps in AUTO/All doors/tailgate closed | |||
| Liftgate Ajar Switch | Data | Ajar/Closed | Closed |
| Liftglass Ajar Switch | Data | Ajar/Closed | Closed |
| Battery Voltage | Data | Volts | Varies |
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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.