Before Programming A Control Module

IMPORTANT: DO NOT program a control module unless you are directed by a service procedure or you 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:
^ Check the vehicle system voltage:
- There is not a charging system concern. All charging system concerns must be repaired before programming a control module.
- Battery voltage is greater than 12 volts but less than 16 volts-The battery must be charged before programming the control module if the battery voltage is low.
- 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, including the following components:
^ Twilight sentinel
^ Interior lights
^ Daytime running lights (DRL)-Applying the parking brake, on most vehicles, disables the DRL system.
^ HVAC systems
^ Cooling System fans
^ Auxiliary coolant pumps
^ Radio, cassette or CD player
^ The ignition switch is in the proper position. The Techline terminal prompts you to turn ON the ignition, 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, including the following items:
- The RS-232
- The connection at the DLC
- The voltage supply circuits