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Home >> Buick >> 2003 >> Century Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 3.1L Engine >> Programming >> Powertrain Control Module >> Before Programming A Control Module
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Before Programming A Control Module

  1. Vehicle system voltage:
    • There are no charging system concerns. All charging system concerns must be repaired before programming a control module.
    • The battery voltage is greater than 12 volts but less than 16 volts. The battery must be fully charged before programming the control module.
    • A battery charger is NOT connected to the vehicles battery. Incorrect system voltage or voltage fluctuations from a battery charger may cause programming failure or control module damage.
    • Turn OFF or disable any system that may put a load on the vehicles battery. Turn OFF or disable Daytime Running Lights (DRL), applying the parking brake, on most vehicles, disables the DRL system. Heating, Ventilation, and Air Conditioning (HVAC) systems, engine cooling fans, etc.
  2. The ignition switch is in the proper position. The scan tool prompts you to turn the ignition switch to RUN position, with the engine OFF. DO NOT change the position of the ignition switch during the programming procedure unless instructed to do so.
  3. All tool connections are secure:
    • The RS-232 cable.
    • The connection at the DLC.
    • The voltage supply circuits.
    • The OBPA.
  4. DO NOT disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or control module damage may occur.
  5. If you are performing the pass-through programming procedure using a notebook computer without the power cord, ensure that the internal battery is fully charged.
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