Section 12 (Analog Instrument Panels): Programming: Notes

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 GMC Savana Special, 2001 GMC Savana Camper Special, 2001 GMC Savana, 2001 Chevrolet RV Cutaway, and 2001 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Do not program a control module unless directed by a service procedure or are directed by a General Motors Corporation service bulletin. Programming a control module at any other time will not permanently correct a customers concern

Ensure the following conditions are met before programming a control module:

There is no charging system concern. All charging system concerns must be repaired before programming a control module.
Battery voltage is 12-16 volts. Battery must be charged before programming the control module if the battery voltage is low.
A battery charger is not connected to vehicle's 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 vehicle's battery (Twilight Sentinel, Interior lights, Daytime Running Lights, HVAC system, engine cooling fans, etc.).
The ignition switch is in the proper position. The scan tool prompts you to turn 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.
All tool connections are secure. Do not disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or control module damage may occur.