Conditions for Running the DTC

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

The battery voltage must be between 9-16 volts.
Headlamp switch is in the ON position.
Headlamp high beam switch is cycled between high beams ON and OFF several times.