Conditions for Setting the DTC

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

All of the following conditions must be met:

The ignition switch is in the ON position.
The headlamp switch is in the PARK or HEAD position.
The fog lamp relay control circuit is shorted to battery positive voltage for 250 milliseconds.