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 1420 (THEFT DETERRENT SYSTEM)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 does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 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/Headlamps in AUTO | |||
| Auto. Learn Timer | Security Data | Seconds | 0 Seconds |
| Battery Voltage | Data | Volts | Varies |
| Left Rear Door Ajar Switch | Inputs | Off/On | Off |
| Passlock™ Code | Security Data | Open/Short/ Tamper/Numeric |
Valid Code 1-10 |
| Passlock™ Data Voltage | Security Data | Volts | 0.86-5 Volts |
| Passlock Ignition Cycles | Security Data | Cycles | Varies |
| Passlock Power | Security Data | On/Off | On |
| Passlock™ State | Security Data | Ignition Off/Tamper/Fail Enable/Fail Enable Dec/Seedkey Lrn Pend/Seedkey Learn/Auto Learn Pend/Learn Passlock™/Monitor Passlock™/Normal Decision/Auto Learn | Monitor Passlock |
| Right Rear Door Ajar Switch | Inputs | Off/On | Off |
| Seed and Key Timer | Security Data | Seconds | 0 Seconds |
| Tamper Timer | Security Data | Seconds | 0-600 |
Powertrain Control Module (PCM) Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Vehicle in PARK/Headlamps in AUTO | |||
| VCM/PCM in Fail Enable | Engine Data 3 | YES/NO | NO |
| VTD Auto. Learn Timer | Engine Data 3 | ACTIVE/INACTIVE | INACTIVE |
| VTD Fuel Disable | Engine Data 3 | ACTIVE/INACTIVE | INACTIVE |
| VTD Fuel Disable Until Ignition Off | Engine Data 3 | YES/NO | NO |
| VTD Password | Engine Data 3 | OK/Incorrect | OK |
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/tailate closed | |||
| 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/tailate closed | |||
| 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/tailate closed | |||
| Liftgate Ajar Switch | Data | Ajar/Closed | Closed |
| Liftglass Ajar Switch | Data | Ajar/Closed | Closed |
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.