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Home >> Pontiac >> 2007 >> Grand Prix Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC B3621 >> Circuit/System Description

Circuit/System Description

The head-up display (HUD) information (image) down switch is used to vertically adjust the HUD image on the windshield to accommodate various vehicle operator heights. The HUD monitors the information (image) down switch signal circuit in order to adjust image positions. When the HUD information (image) down switch is depressed and the ignition is in the RUN position, the switch signal to the HUD is low.

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