WARNING: This page is about a different car, the 2005 Saturn Ion Red Line, 2005 Saturn Ion 3, 2005 Saturn Ion 2, and 2005 Saturn Ion 1. However, it is still accessible from the selected car via links, so may be relevant.
Body Control Module (BCM)
Scan Tool Output Control
Additional Menu Selection(s)
Description
Rear Defogger
Miscellaneous Test
The BCM actuates the Rear Defogger relay when you select ON. The rear window defogger grid should become warm.