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Home >> Pontiac >> 2004 >> Grand Prix GTP >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays, Gauges And Console >> Diagnostic Information and Procedures >> DTC B3621 >> Circuit Description

Circuit Description

The HUD monitors the switch signal circuits in order to perform various functions. The HUD switch contains 3 active low momentary switches, and a variable resistor. The HUD detects a switch activation when the signal circuit is active.

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