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Home >> BMW >> 2001 >> 330xi Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Transmission - Overview >> Transmission Control System (GS 20) >> GS 20 Output Control Signals >> Back Up Light Relay Control
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Back Up Light Relay Control

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.

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