Conditions for Running the DTC

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The system voltage must be between 9.0 and 16.0 volts.
The ignition switch in the OFF position.
Unlock doors from the remote control door lock key fob, or open any door, or turn ON the dome lamp from the switch (thumbwheel).
The above conditions must be met for more than 0.5 seconds.