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Home >> Buick >> 2012 >> Regal GS, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Data Communications System >> Diagnostic Information and Procedures >> DTC U1901 >> Circuit/System Description
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Circuit/System Description

The radio interfaces only with the Info Display Module and the Info Display Module communicates with the radio/HVAC control through a LIN interface. The Info Display Module is responsible for passing information between the radio and the radio/HVAC control.