Conditions for Setting the DTC

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The control circuit of the STRTR relay is open or shorted to voltage for 2 seconds when the ignition switch is in the ON position.
The control circuit of the STRTR relay is shorted to ground for 5 seconds when the ignition switch is in the start position.