2003 Hummer H2FACTORY OEM SERVICE PROCEDURE

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 MODESΒ .

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
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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