Back Up Light Relay Control
WARNING: This page does not describe the selected car, but rather 43 other vehicles, including the 2006 BMW M3, 2006 BMW 330Ci, 2006 BMW 325Ci, 2005 BMW M3, and 2005 BMW 330xi. However, it is still accessible from the selected car via links, so may be relevant.
As an output function, the GS 20 provides a switched ground to activate the control circuit of the back up light relay when the range selector is in reverse. The Back Up Light Relay provides power directly to the back up lights. The lighting circuit is also used as a high signal indicating Reverse status for PDC, NAV and the electro chromatic rearview mirror systems.