Before Programming A Control Module (On-Board)

Ensure that 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.
• Ensure that the battery voltage is greater than 12 volts, but less than 16 volts. If the battery voltage is low, the battery must be charged before programming the control module.
• Ensure that a battery charger is not connected to the 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 (i.e., twilight sentinel, interior lights, Daytime Running Lights (DRL), HVAC systems, engine cooling fans).
• Ensure that the ignition switch is in the proper position. The scan tool 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.
• Ensure that all tool connections are secure (at RS-232, data link connector and voltage supply circuits).
• Do not disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or control module damage may occur.