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 266 (BODY CONTROL MODULES)DESCRIPTION & OPERATIONSERIAL DATA POWER MODE
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Serial Data Power Mode
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Serial Data Power Mode
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Power Mode Master (PMM) is Dash Integration Module (DIM). DIM uses ACC voltage, RUN/START voltage, IGNITION 3 voltage and OFF/RUN/STARTvoltage to determine power mode. For power mode combinations, see POWER MODES .
POWER MODES
| Ignition Switch Position | ACC | IGNITION 3 | RUN/START | OFF/RUN/START | Power Mode |
|---|---|---|---|---|---|
| OFF | Inactive | Inactive | Inactive | Inactive | Off/Awake Or RAP |
| ACC | Active | Inactive | Inactive | Active | Accessory |
| START | Inactive | Inactive | Active | Active | Start/Crank |
| RUN | Active | Active | Active | Active | Run |
RENDER: 1.0x
NO RELATED
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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.